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Netgear TLS Private Key Disclosure through Device Firmware Images
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netgear-private-key-disclosure.md

Netgear Signed TLS Cert Private Key Disclosure

Overview

There are at least two valid, signed TLS certificates that are bundled with publicly available Netgear device firmware.

These certificates are trusted by browsers on all platforms, but will surely be added to revocation lists shortly.

The firmware images that contained these certificates along with their private keys were publicly available for download through Netgear's support website, without authentication; thus anyone in the world could have retrieved these keys.

routerlogin.net

Both keys found were contained in the R9000-V1.0.5.8 firmware image file available here: http://www.downloads.netgear.com/files/GDC/R9000/R9000-V1.0.5.8.zip

This is the output from reading the certificate file in openssl:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            c1:a1:00:64:07:61:2c:07:00:00:00:00:50:f1:09:6a
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = US, O = "Entrust, Inc.", OU = See www.entrust.net/legal-terms, OU = "(c) 2012 Entrust, Inc. - for authorized use only", CN = Entrust Certification Authority - L1K
        Validity
            Not Before: May  1 00:23:51 2019 GMT
            Not After : Jul 30 00:53:50 2021 GMT
        Subject: C = US, ST = California, L = San Jose, O = "Netgear, Inc", CN = www.routerlogin.net
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                RSA Public-Key: (2048 bit)
                Modulus:
                    00:c9:6d:0a:79:c9:ca:64:cd:ea:f0:ac:f4:bf:f6:
                    37:2b:1b:5a:f9:2c:10:52:d6:ee:4e:21:d3:00:2b:
                    18:fd:08:a0:6b:92:26:86:40:26:ef:f3:b7:dc:4d:
                    63:b8:04:0e:a0:78:bc:87:4e:50:d6:2d:3c:d4:f1:
                    ed:b8:10:9c:bf:e7:eb:59:a9:19:4d:f7:dc:73:9d:
                    b0:13:0a:29:41:4e:47:25:25:11:18:64:83:67:bd:
                    77:6d:22:b3:1f:df:db:29:09:20:d9:a1:3f:67:95:
                    83:ce:7e:02:c8:6f:46:46:f5:60:1b:75:30:8a:dc:
                    c4:a0:e6:e3:97:e0:f5:d7:ce:15:21:2d:26:c2:ef:
                    66:a6:79:bf:ac:28:af:e2:d4:7f:6e:8d:31:a5:07:
                    fa:c6:e2:91:cc:b0:cf:c8:27:4c:f1:8d:d8:14:8b:
                    ca:d5:c7:2b:10:72:12:66:63:46:02:1b:f2:ab:8a:
                    a2:1c:18:39:1f:4c:ed:a9:ca:ed:e7:05:96:a6:6a:
                    a0:ab:76:bd:68:c6:ee:43:4d:e4:51:ce:79:a3:0b:
                    81:7c:ea:67:87:75:03:25:ee:5f:f9:67:d7:12:a8:
                    76:c5:a3:37:35:5f:d1:61:26:ab:9a:f3:b3:7d:4d:
                    d1:24:73:ed:d7:74:3e:e8:b9:d5:4e:d7:9f:b5:f2:
                    46:c5
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Subject Alternative Name: 
                DNS:www.routerlogin.net, DNS:routerlogin.net, DNS:www.routerlogin.com, DNS:routerlogin.com
            CT Precertificate SCTs: 
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 55:81:D4:C2:16:90:36:01:4A:EA:0B:9B:57:3C:53:F0:
                                C0:E4:38:78:70:25:08:17:2F:A3:AA:1D:07:13:D3:0C
                    Timestamp : May  1 00:53:53.294 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:44:02:20:0B:F3:9B:CB:60:8F:CE:00:51:E5:BE:2A:
                                61:21:2D:F6:4A:4F:AE:A8:B6:86:6D:D4:3F:30:1B:93:
                                42:C5:F5:B0:02:20:24:62:CD:72:37:EF:B9:D9:25:DF:
                                28:BC:56:E3:79:B2:21:14:58:2B:4B:05:78:D2:69:66:
                                8E:89:1A:65:32:4C
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 87:75:BF:E7:59:7C:F8:8C:43:99:5F:BD:F3:6E:FF:56:
                                8D:47:56:36:FF:4A:B5:60:C1:B4:EA:FF:5E:A0:83:0F
                    Timestamp : May  1 00:53:53.333 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:44:02:20:16:80:A7:86:0B:EA:DD:3F:0A:6B:5D:10:
                                1E:C3:E2:8A:92:F7:6F:28:85:9D:64:FA:CF:24:F8:02:
                                C5:A5:15:0C:02:20:34:D0:90:D7:4C:6D:14:56:49:5C:
                                DC:A6:B1:18:BC:29:32:F0:37:0A:B7:A9:5F:43:37:DC:
                                B2:F2:A4:FA:FA:AA
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 56:14:06:9A:2F:D7:C2:EC:D3:F5:E1:BD:44:B2:3E:C7:
                                46:76:B9:BC:99:11:5C:C0:EF:94:98:55:D6:89:D0:DD
                    Timestamp : May  1 00:53:53.346 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:21:00:86:C3:D7:ED:C6:80:41:33:FC:6F:8F:
                                36:00:67:BB:58:F4:52:85:D7:1F:EF:46:E5:E1:1C:1F:
                                55:40:75:EC:DB:02:20:4B:2A:41:34:4D:5E:FD:FA:87:
                                C5:E8:A1:26:9C:EF:DE:BA:09:7A:24:6D:8E:2A:46:6F:
                                12:EB:4B:DE:A4:5E:62
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : F6:5C:94:2F:D1:77:30:22:14:54:18:08:30:94:56:8E:
                                E3:4D:13:19:33:BF:DF:0C:2F:20:0B:CC:4E:F1:64:E3
                    Timestamp : May  1 00:53:53.335 2019 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:21:00:E9:65:92:90:57:A3:FC:D6:5C:B1:32:
                                1B:F9:AF:78:85:91:F8:72:43:95:98:38:33:E6:75:A4:
                                FC:AA:29:BF:15:02:20:79:8A:8A:8F:44:F2:72:E5:05:
                                5F:7D:5E:FA:95:41:03:AA:BE:BF:95:44:5C:12:A5:C8:
                                6D:EE:31:E3:D6:E3:1F
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment
            X509v3 Extended Key Usage: 
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 CRL Distribution Points: 

                Full Name:
                  URI:http://crl.entrust.net/level1k.crl

            X509v3 Certificate Policies: 
                Policy: 2.16.840.1.114028.10.1.5
                  CPS: http://www.entrust.net/rpa
                Policy: 2.23.140.1.2.2

            Authority Information Access: 
                OCSP - URI:http://ocsp.entrust.net
                CA Issuers - URI:http://aia.entrust.net/l1k-chain256.cer

            X509v3 Authority Key Identifier: 
                keyid:82:A2:70:74:DD:BC:53:3F:CF:7B:D4:F7:CD:7F:A7:60:C6:0A:4C:BF

            X509v3 Subject Key Identifier: 
                5D:17:F2:BC:F7:B8:2D:0B:B8:4C:E8:EA:A2:79:E9:10:65:29:62:9D
            X509v3 Basic Constraints: 
                CA:FALSE
    Signature Algorithm: sha256WithRSAEncryption
         21:36:ac:a8:3a:e8:47:17:90:dd:d8:5c:e0:27:78:f1:d6:f9:
         b8:94:29:64:76:8f:79:4c:51:7b:c6:2c:e7:78:4f:6c:c3:3c:
         18:55:3e:48:ba:0d:65:2f:5c:0c:7a:8c:8b:cd:7e:d9:fc:e3:
         89:54:07:41:2c:e9:f6:7f:bc:eb:22:e0:45:20:5c:5b:1d:87:
         9c:19:38:76:fd:65:67:57:43:8e:eb:5d:1d:4e:81:bd:7e:53:
         0a:7b:85:aa:13:ba:7e:bc:eb:87:2d:51:44:3e:5b:54:71:82:
         b0:a4:69:4a:7d:f9:ea:df:51:f2:f8:53:a8:5c:6e:34:71:8c:
         1d:d5:16:57:cc:80:37:4d:2c:8d:5c:79:2d:4e:22:d0:ef:42:
         ea:f9:21:4f:e9:b2:95:1a:4d:cc:0c:e2:87:2c:a4:1a:ed:a0:
         55:0f:52:0c:24:b3:dc:1e:fd:f8:cf:df:91:3c:98:a7:8f:9f:
         e6:da:92:f7:13:d4:91:c2:cb:0a:40:12:fa:a0:db:57:4c:30:
         ae:65:47:5a:25:a5:40:7c:98:1e:2d:51:40:82:cc:5d:5c:34:
         d1:01:8d:e3:29:55:b1:f5:59:59:7c:55:72:e2:59:99:87:64:
         3d:2b:9f:56:e9:53:13:73:af:ab:4c:e1:d8:26:be:73:7c:78:
         d7:0a:12:42

According to the above output, this certificate, which is signed by EnTrust, is valid for the following DNS host names:

The corresponding private key for this certificate is:

-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----

These files were found respectively at /etc/uhttpd.crt and /etc/uphttpd.key in the aforementioned firmware image.

mini-app.funjsq.com

In the same firmware image was an additional valid TLS Certificate and its corresponding private key.

The files were found at the paths /data/funjsq/config/httpd/cert.pem and /data/funjsq/config/httpd/key.pem.

The openssl output for this certificate is:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            bf:c0:c9:fd:2e:8c:92:ec:4e:bf:10:d8:c1:28:3d:0b
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Domain Validation Secure Server CA
        Validity
            Not Before: Jul 26 00:00:00 2018 GMT
            Not After : Jul 25 23:59:59 2020 GMT
        Subject: OU = Domain Control Validated, OU = PositiveSSL, CN = mini-app.funjsq.com
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                RSA Public-Key: (2048 bit)
                Modulus:
                    00:cc:57:d5:45:ad:bd:60:c8:af:6f:50:97:ef:df:
                    67:b0:1d:69:1d:a3:75:e9:ba:08:8d:4c:54:2e:b6:
                    83:1c:2e:e1:1f:66:0c:fb:7a:d0:9a:ce:52:a4:3f:
                    75:70:f4:39:73:f3:f5:86:2e:96:59:e6:a5:54:62:
                    17:52:15:ad:6f:22:bd:7d:84:36:14:7a:3b:1c:60:
                    61:7a:7d:86:d8:e2:99:49:d4:06:e9:7a:00:f2:43:
                    f9:11:87:06:c8:20:0e:fc:15:51:bb:13:9d:ed:27:
                    39:df:cd:ec:46:6f:ed:a7:56:4f:71:a3:46:d7:25:
                    f2:5a:38:a9:23:a1:89:0e:6e:f1:3d:6b:04:05:0e:
                    8b:32:bc:f1:1c:0e:f8:6c:95:e2:cd:6c:38:1a:e6:
                    a6:3f:3b:22:41:f7:23:45:36:82:58:3c:a5:89:aa:
                    6e:16:e0:32:c2:38:a8:42:ba:de:ae:b4:03:f3:0b:
                    a4:9e:6b:a6:31:68:14:da:20:93:aa:a7:a7:49:f4:
                    6d:3e:c8:39:72:e1:62:35:cc:67:3f:08:2e:ae:8b:
                    ac:fc:14:3b:9d:b8:c7:5b:9b:db:08:3a:2b:98:aa:
                    0e:3e:92:5c:e7:e6:db:13:bb:47:e0:3b:3d:60:e5:
                    f3:22:e8:8f:01:04:cf:e3:c3:fc:7e:e2:6c:23:2c:
                    48:17
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Authority Key Identifier: 
                keyid:90:AF:6A:3A:94:5A:0B:D8:90:EA:12:56:73:DF:43:B4:3A:28:DA:E7

            X509v3 Subject Key Identifier: 
                27:B5:A2:32:E3:84:92:C6:D3:38:A3:83:6A:61:B2:C0:E7:43:53:1D
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Extended Key Usage: 
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 Certificate Policies: 
                Policy: 1.3.6.1.4.1.6449.1.2.2.7
                  CPS: https://secure.comodo.com/CPS
                Policy: 2.23.140.1.2.1

            X509v3 CRL Distribution Points: 

                Full Name:
                  URI:http://crl.comodoca.com/COMODORSADomainValidationSecureServerCA.crl

            Authority Information Access: 
                CA Issuers - URI:http://crt.comodoca.com/COMODORSADomainValidationSecureServerCA.crt
                OCSP - URI:http://ocsp.comodoca.com

            X509v3 Subject Alternative Name: 
                DNS:mini-app.funjsq.com, DNS:www.mini-app.funjsq.com
            CT Precertificate SCTs: 
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : EE:4B:BD:B7:75:CE:60:BA:E1:42:69:1F:AB:E1:9E:66:
                                A3:0F:7E:5F:B0:72:D8:83:00:C4:7B:89:7A:A8:FD:CB
                    Timestamp : Jul 26 14:44:17.854 2018 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:46:02:21:00:94:5A:FE:A8:70:93:59:E5:0A:F1:B5:
                                29:FE:2E:0D:91:34:D5:A8:A9:1D:C1:63:77:16:F3:75:
                                67:16:6C:25:33:02:21:00:93:66:BA:D6:27:57:D8:59:
                                A5:C7:73:87:23:AB:F9:84:D9:DD:BA:50:A7:FC:5E:8E:
                                40:74:A0:DD:9C:BA:CF:BD
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 5E:A7:73:F9:DF:56:C0:E7:B5:36:48:7D:D0:49:E0:32:
                                7A:91:9A:0C:84:A1:12:12:84:18:75:96:81:71:45:58
                    Timestamp : Jul 26 14:44:18.391 2018 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:21:00:F1:07:91:63:03:B7:51:60:5F:ED:FD:
                                72:43:E7:8F:98:34:A8:9E:85:CF:C1:33:AB:AF:7C:C1:
                                B3:16:75:A8:79:02:20:30:F7:DB:8E:C7:D3:9F:86:42:
                                80:B7:C6:6B:0D:D5:14:85:99:BC:3F:99:79:D3:43:24:
                                3C:17:4F:2E:BE:A6:6A
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 55:81:D4:C2:16:90:36:01:4A:EA:0B:9B:57:3C:53:F0:
                                C0:E4:38:78:70:25:08:17:2F:A3:AA:1D:07:13:D3:0C
                    Timestamp : Jul 26 14:44:17.893 2018 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:21:00:F8:DF:94:32:61:C5:71:5F:D5:84:87:
                                15:58:57:B8:9E:9F:81:88:A5:3A:4E:C1:8A:6E:73:38:
                                19:FD:33:9B:D4:02:20:73:80:2E:EE:4F:1D:F0:08:9A:
                                1D:85:FB:51:D8:66:7A:96:2F:C0:12:4E:EF:AD:2E:1D:
                                6E:B7:FC:3D:7D:DB:B8
    Signature Algorithm: sha256WithRSAEncryption
         61:da:c4:80:ee:eb:f7:67:95:31:b8:55:7f:27:64:30:68:9f:
         5e:2d:5c:40:cc:a7:12:f9:74:a6:e8:b1:d2:10:b7:c8:99:80:
         05:25:56:d1:51:59:5d:54:d9:a5:bd:c5:d4:ac:da:16:73:d9:
         8d:97:cc:f5:64:85:3d:1f:02:c4:37:b5:7b:9a:06:fb:a0:bf:
         d4:27:11:c0:98:f0:28:aa:84:bc:3b:bf:67:18:cc:3d:13:46:
         4d:18:9b:ca:62:09:52:2d:df:df:b2:4b:ac:fb:b2:7d:58:16:
         39:87:20:d6:c9:82:cf:e5:2a:9d:e9:6d:7f:6f:56:6d:b7:a4:
         be:54:c4:ed:4a:73:74:10:b4:a2:94:e9:10:4a:69:9d:60:0d:
         ec:45:4c:e4:12:d9:ab:ce:28:fc:da:4e:e7:d6:90:3e:87:2b:
         2d:24:de:79:84:10:95:c7:be:4a:9f:c7:b2:64:0e:b3:0d:3e:
         15:7c:32:c4:84:3a:d7:b5:67:96:0e:cc:3c:5e:e3:a0:cb:31:
         d0:81:85:af:1e:bc:a6:fd:84:ec:76:e9:31:95:6a:dc:de:49:
         59:24:14:66:a7:69:6b:f0:4d:14:1f:e2:31:f9:42:1d:d8:76:
         9f:08:0a:2b:5c:53:8f:86:60:5a:65:ce:6a:dc:56:ef:b7:30:
         69:f3:37:ec
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

The corresponding private key is:

-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----

The DNS host name for the certificate is mini-app.funjsq.com.

Rationale for Full Disclosure

We are aware that Netgear has public bug bounty programs. However, at current date those programs do not allow public disclosure under any circumstances.

We as researchers felt that the public should know about these certificate leaks in order to adequately protect themselves and that the certificates in question should be revoked so that major browsers do not trust them any longer. We could not guarantee either if we had used the existing bug bounty programs.

Disclosure Timeline

  • Tuesday, January 14th 2020 - Initial Discovery
  • Tuesday, January 14 2020 - Tweet sent attempting to establish communications with Netgear
  • Wednesday, January 15 2020 - Reached out to Bugcrowd to attempt to establish communications.
  • Thursday, January 16 - Bugcrowd responds, but we are unable to establish a communications channel outside of the Netgear bug bounty programs.
  • Friday, Jaunary 17th - Conversation with bugcrowd proves inconclusive
  • Sunday, January 19th - Feeling we have exhausted our disclosure avenues, we decide to publish

Credits

  • Tom Pohl (@tompohl)
  • Nick Starke (@nstarke)
@vogsphar
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It's better than HTTP because it requires active MitM
It's worse than HTTP because it gives the user a false sense of security.
It's better than TOFU/self signed because the user is not presented with a browser warning (and thus can use the device)
It's worse than TOFU/self signed because the user is not presented with a browser warning (and thus does not know about attacks)
It's a solution to an unsolved problem...
Thanks for sharing :)

This is the best explainaition of this complicated topic i have ever read. How can embedded device manufacturers provide browser based configuration without scaring away users?

p.s. They are not the only vendor doing this.

@jsonn
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jsonn commented Jan 20, 2020

@vogsphar By embedding a device-specific directly in the hardware and shipping a matching certificate. But that would increase the cost and therefore most vendors are not willing to do it. Snom phones for example all have their own certificate/key pair for a (private) Snom CA. This can be used when securing access to configuration files for network deployment, e.g. to not leak the SIP passwords. Works the other way around too, only downside is that the certificate itself needs to have a life time matching the hardware.

@bradfa
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bradfa commented Jan 20, 2020

How can embedded device manufacturers provide browser based configuration without scaring away users?

Have each device use a unique certificate and keys. Ideally, the device will generate and store the private key in a piece of protected hardware which will allow for the device to generate a certificate signing request which the manufacturer can then sign and push back into the device on the assembly line.

Then, when a new firmware comes out, it doesn't have any keys in it, the keys are already in each device secured in a hardware "vault." When the device nears the expiration of the keys/certificates, it can generate a new private key and signing request and send it over the Internet to the manufacturer. Because each device has a unique set of keys and certificate, the manufacturer can verify that the device which is making the new certificate signing request over the Internet is the same one which they signed on the manufacturing line, and so can sign this new request too. Some privacy or manufacturer expected life concerns may arise here.

In Netgear's case, it seems like their router needs to be your DNS server when you connect, so that they can use the routerlogin.net name in their certificate. For devices which will be accessed using a name which the device doesn't know at manufacturing time, then a slightly different procedure may be needed, although the device likely can reach the Internet most of the time if it is a non-router consumer network device, so could simply figure out what name the customer will access it by and perform the certificate signing request as above during setup rather than waiting until the original cert expires.

@paragonie-security
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There's no need to ruminate over how to solve this problem. It's fairly straightforward.

From https://twitter.com/CiPHPerCoder/status/1219228544548720640

Things to do instead of shipping TLS certs and static private keys to consumer-grade routers you sell by the thousand:

  1. Generate a unique keypair per device.
  2. Use this keypair to communicate upstream, in a similar fashion to CloudFlare's Keyless SSL.
  3. ????
  4. Profit!

This keypair you generate on the device would need to be preloaded at the factory, unique per device, and the public key would need to be stored in a database.

When a TLS handshake comes in, you verify the entire request is signed by that keypair before signing it.

Delegated online signing for a TLS handshake isn't even in the top 10 engineering challenges for cryptography in the 2020s.

Oh, and, if you don't have connectivity to upstream and your need users to connect to configure something?
Fallback to HTTP reachable via port 80 on the private IP for the server.

These are solved problems. Netgear just has to care about implementing the solutions. (They don't care.)

@nicholasknight
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@ThiefMaster In addition to what was already said, CAs are stewards of the public trust and have invested substantial time and resources - including in legal threats against browsers - to try and keep it that way. The web PKI is widely acknowledged as broken and the only reason it hasn’t changed is because a few powerful companies have stood in the way and insisted they can be trusted to maintain its integrity anyway so that they can continue bilking unwary customers out of money. It’s their cash cow. Incidents like this are clear and objective evidence they are poor stewards undeserving of that trust.

@jsonn
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jsonn commented Jan 20, 2020

There's no need to ruminate over how to solve this problem. It's fairly straightforward.

It is not that straightforward. Using a router as wireless access point without network access is a perfectly reasonable use case. Heck, on first use Internet access is often not available because the router hasn't been configured appropriately yet. As so often, the devil is in the details. Just shipping a 2k RSA certificate with 10a life time per device can't be that costly though.

@synapt
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synapt commented Jan 20, 2020

Possibly worthy note, if I recall correctly netgear routers will literally MitM DNS requests for those domains (baring any form of encrypted DNS of course) and explicitly return a value of the gateway IP configured.

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ghost commented Jan 20, 2020

This is intentional on Netgear's part, and does not in any way degrade security compared to the alternative (an untrusted cert or no HTTPS). It is neither a bug nor a security issue.

@marcan
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marcan commented Jan 20, 2020

It is a bug because they aren't allowed to do this per the WebPKI requirements, and their CA must and will revoke the certificate now, which means the feature will stop working.

It doesn't matter whether you think the way the feature works is acceptable; the rules are the rules and as soon as they get caught doing this, as they have now, the certificate will be revoked, so they can't do this unless they want to have features that only work until someone discovers how they work.

@Flamefire
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In defence of netgear: You failed to determine the use case and problem:
The "URL" used here is a pseudo-URL used to configure a router. While Netgear owns the actual domain, nothing is there and you are redirected to Netgear instead.

For configuring the router you may assume that there is NO way to connect to the internet at the point where the user connects to this pseudo-URL with content served by the router. Browsers like Chrome have chosen to show scary warning signs if a website is used which does not use HTTPS. @theckman provides good reasoning: Avoid users calling support over this expected non-issue.

So "Use this keypair to communicate upstream" is not possible, and "generate a new private key and signing request and send it over the Internet" is similarly not possible. Having a router specific certificate incurs high cost and certificates expire. So not a solution either.

@yakatz
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yakatz commented Jan 20, 2020

The proper solution is what Verizon does. They have every gateway use a self-signed certificate. When you go to the IP address with http, it shows a message warning you that it will redirect to https and you will get a certificate error. If you don't understand that, you probably shouldn't be accessing the router interface.

@olmari
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olmari commented Jan 20, 2020

80 -> 443 rediction with warning like Verzon is very acceptable approach, as long as http is not considered totally "red" method by browsers, which it is moving towards to.

@grandamp
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Network devices have been at the forefront of bad/weak/improper certificates in the past:

https://factorable.net/

This issue is an interesting find, and I'm curious what Netgear, Entrust, and Comodo will do to mitigate

@gnuheidix
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I bet there are definitely more than the mentioned certificates affected. Certificate Transparency: https://crt.sh/?q=routerlogin.net

@grandamp
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Clearly, the private key is compromised for at least 2 of them: https://crt.sh/?ski=5d17f2bcf7b82d0bb84ce8eaa279e9106529629d

@gnuheidix
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It seems Netgear is already patching this stuff out of some of their devices. In this firmware 2.5.1.8 it's self-signed and in its predecessor 2.2.1.212 it's an Entrust certificate which is expired by now. In the release notes of 2.5.1.8 it is noted as "Update the web server certification of RBR50/RBS50."

In my opinion Netgear was very well aware of this screw-up prior to this bug report.

@acohn
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acohn commented Jan 20, 2020

Sectigo/Comodo has revoked the mini-app.funjsq.com certificate as of about eight hours ago. The routerlogin.net one is still currently valid.

@IanBP
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IanBP commented Jan 21, 2020 •
edited
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Netgear uses another domain, mywifiext.net, for their wireless range extenders. I'd wager that the same issue exists for those devices as well.

@ringdan
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ringdan commented Jan 21, 2020

Aside from the certificate issue, Netgear probably should improve their bug report and bug bounty process.

@gnuheidix
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Netgear has published a security advisory. https://kb.netgear.com/000061582/

@Celestial-intelligence
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You should also look at Aruba Access Points. Saw same private shit out there. (Aruba AP-225 https://support.arubanetworks.com/Default.aspx?TabId=121&DMXModule=661&EntryId=33599)
By the way, they don't have open bug bounty program.
And they are the main contractor of the US Army.

@domenukk
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Netgear has published a security advisory. https://kb.netgear.com/000061582/

Under "Workarounds":
Instead of using HTTPS, log in to your router’s web browser interface using HTTP: http://routerlogin.com.

Instead of allowing active attackers to decrypt, send decrypted. Makes you wonder.

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ghost commented Jun 13, 2020

@marcan I'm not sure how you came to the conclusion that it being someone else's bug makes it Netgear's bug.

And who even is "WebPKI"? 🤣 An abstract concept can't have rules nor requirements

@marcan
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marcan commented Jun 14, 2020

And who even is "WebPKI"? An abstract concept can't have rules nor requirements

The WebPKI is managed by the CA/Browser forum, an organization with actual rules and requirements that they all agree to uphold.

@minanagehsalalma
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minanagehsalalma commented Sep 3, 2020 •
edited
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@marcan is it possible to decrypt the encrypted packets after capturing them using airodump ?

if so how can that be possible ?

edit : i think i found it
https://accedian.com/blog/how-to-decrypt-an-https-exchange-with-wireshark/

@marcan
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marcan commented Sep 4, 2020

Only if the session is not using a ciphersuite with perfect forward secrecy, otherwise you need an active attack.

@minanagehsalalma
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minanagehsalalma commented Sep 4, 2020 •
edited
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Only if the session is not using a ciphersuite with perfect forward secrecy, otherwise you need an active attack.

@marcan what about this one ?

the cert file exported from the copy to file option when clicking on the cert info in google chrome https://ufile.io/w1v256rd

and this what shows up when i open the page with fiddler on.

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.3 (TLS/1.2)
Random: 33 36 29 0C 1F C3 CA 3E D6 C7 D2 9E F3 17 5A C0 EE 89 4B 85 EE 61 2D BD 31 D5 61 EB 9C 8A D9 F5
"Time": 6/19/1976 1:17:23 PM
SessionID: F6 5F 76 F3 EA DD 0E 14 AD 52 05 2C A9 F1 96 6C FB 7D 0D D7 3A FC 47 D0 DC A8 26 35 C1 40 94 1F
Extensions:

also here is the pcap file from wireshark

https://ufile.io/yaid56oe

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