search for: openssh_rsa_verify

https://bugzilla.mindrot.org/show_bug.cgi?id=2460 Bug ID: 2460 Summary: Non-zero return values are not properly returned from openssh_RSA_verify Product: Portable OpenSSH Version: 7.1p1 Hardware: All OS: All Status: NEW Severity: normal Priority: P5 Component: sshd Assignee: unassigned-bugs at mindrot.org Reporter: me at basilcrow.co...

...N.1 and buffer code that can be exploited to cause a heap overflow: http://lists.grok.org.uk/pipermail/full-disclosure/2012-April/086585.html Fortunately OpenSSH's sshd is not vulnerable - it has avoided the use of ASN.1 parsing since 2002 when Markus wrote a custom RSA verification function (openssh_RSA_verify): http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/ssh-rsa.c?rev=HEAD;content-type=text%2Fplain That's now eight exploitable bugs that this change has saved us from. It's a good lesson in how excising even a relatively small amount of complex attack surface can make a substantial dif...

Functionality request for supporting Digital Signatures for RSA and DSS Public Key Algorithms in alignment with NIST SP800-131A. I assume this has been asked before, but I could not find in the archives. Support of "ssh-rsa-sha256" and "ssh-dss-sha256" public key algorithms for OpenSSH? I know Suite B Algorithms and x509 SSH Extension Algorithms are supported, but not a

...pubkey in authorized_keys etc However, certificates are verified before such checks: userauth_pubkey() -> sshkey_from_blob() -> sshkey_from_blob_internal() -> cert_parse() -> sshkey_verify(key->cert->signature_key) -> ssh_rsa_verify() (or others, depending on cert type) -> openssh_RSA_verify() -> RSA_public_decrypt() The signature algorithm *is* subsequently checked, but of course RSA_public_decrypt has already been called by that point. Outside of CVE-2024-3094, which is not openssh's reponsibility, that is not a correctness issue. But doing verification of signatures with a...

...ts doesn't exist. * sshd(8): correct packet format for tcpip-forward replies for requests that don't allocate a port bz#2509 * ssh(1), sshd(8): fix possible hang on closed output. bz#2469 * ssh(1): expand %i in ControlPath to UID. bz#2449 * ssh(1), sshd(8): fix return type of openssh_RSA_verify. bz#2460 * ssh(1), sshd(8): fix some option parsing memory leaks. bz#2182 * ssh(1): add a some debug output before DNS resolution; it's a place where ssh could previously silently stall in cases of unresponsive DNS servers. bz#2433 * ssh(1): remove spurious newline in visual ho...

...ts doesn't exist. * sshd(8): correct packet format for tcpip-forward replies for requests that don't allocate a port bz#2509 * ssh(1), sshd(8): fix possible hang on closed output. bz#2469 * ssh(1): expand %i in ControlPath to UID. bz#2449 * ssh(1), sshd(8): fix return type of openssh_RSA_verify. bz#2460 * ssh(1), sshd(8): fix some option parsing memory leaks. bz#2182 * ssh(1): add a some debug output before DNS resolution; it's a place where ssh could previously silently stall in cases of unresponsive DNS servers. bz#2433 * ssh(1): remove spurious newline in visual ho...

...ts doesn't exist. * sshd(8): correct packet format for tcpip-forward replies for requests that don't allocate a port bz#2509 * ssh(1), sshd(8): fix possible hang on closed output. bz#2469 * ssh(1): expand %i in ControlPath to UID. bz#2449 * ssh(1), sshd(8): fix return type of openssh_RSA_verify. bz#2460 * ssh(1), sshd(8): fix some option parsing memory leaks. bz#2182 * ssh(1): add a some debug output before DNS resolution; it's a place where ssh could previously silently stall in cases of unresponsive DNS servers. bz#2433 * ssh(1): remove spurious newline in visual ho...

https://bugzilla.mindrot.org/show_bug.cgi?id=2451 Bug ID: 2451 Summary: Bugs intended to be fixed in 7.2 Product: Portable OpenSSH Version: -current Hardware: All OS: All Status: NEW Severity: trivial Priority: P5 Component: Miscellaneous Assignee: unassigned-bugs at