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Files from David Benjamin

First Active2015-07-10
Last Active2015-07-27
OpenSSL Alternative Chains Certificate Forgery MITM Proxy
Posted Jul 27, 2015
Authored by Ramon de C Valle, Adam Langley, David Benjamin | Site metasploit.com

This Metasploit module exploits a logic error in OpenSSL by impersonating the server and sending a specially-crafted chain of certificates, resulting in certain checks on untrusted certificates to be bypassed on the client, allowing it to use a valid leaf certificate as a CA certificate to sign a fake certificate. The SSL/TLS session is then proxied to the server allowing the session to continue normally and application data transmitted between the peers to be saved. The valid leaf certificate must not contain the keyUsage extension or it must have at least the keyCertSign bit set (see X509_check_issued function in crypto/x509v3/v3_purp.c); otherwise; X509_verify_cert fails with X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY. This Metasploit module requires an active man-in-the-middle attack.

tags | exploit, crypto
advisories | CVE-2015-1793
MD5 | 244abcb9001d9746e6846f9785dab572
FreeBSD Security Advisory - OpenSSL Certificate Forgery
Posted Jul 10, 2015
Authored by Adam Langley, David Benjamin | Site security.freebsd.org

FreeBSD Security Advisory - During certificate verification, OpenSSL will attempt to find an alternative certificate chain if the first attempt to build such a chain fails, unless the application explicitly specifies X509_V_FLAG_NO_ALT_CHAINS. An error in the implementation of this logic could erroneously mark certificate as trusted when they should not. An attacker could cause certain checks on untrusted certificates, such as the CA (certificate authority) flag, to be bypassed, which would enable them to use a valid leaf certificate to act as a CA and issue an invalid certificate.

tags | advisory
systems | freebsd
advisories | CVE-2015-1793
MD5 | 26ed640fe93813ad02963f1321eb4af2
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