oss-sec mailing list archives
Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities
From: Solar Designer <solar () openwall com>
Date: Thu, 13 Aug 2015 19:44:20 +0300
On Thu, Aug 13, 2015 at 12:20:04AM +0200, Moritz Jodeit wrote:
On 12.08.2015 22:48, Solar Designer wrote:Are systems with "keyboard interactive" and "challenge-response" authentication disabled (all of PAMAuthenticationViaKbdInt, KbdInteractiveAuthentication, and ChallengeResponseAuthentication, as applicable to a given sshd version, set to no) affected by these issues as well? The code appears to be specific to this mode, but it isn't immediately clear whether or not these configuration settings prevent the vulnerable code from being reached in the privsep monitor even when the privsep child is compromised. If the settings do not currently prevent the code from being reached (I hope they do), then this should be corrected as a hardening measure.As long as UsePAM is enabled in the configuration, all the PAM-related monitor requests can be send to the monitor. This at least allows triggering the use-after-free even if all the settings you mentioned are set to "no". Not sure if a full authentication is possible in this case though.
Damien, are you reading this? Looks like there's a hardening change for you(?) to implement. Please comment. Thanks! Alexander
Current thread:
- CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Moritz Jodeit (Aug 11)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Adam Maris (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Adam Maris (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Solar Designer (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Moritz Jodeit (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Solar Designer (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Moritz Jodeit (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Solar Designer (Aug 13)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Moritz Jodeit (Aug 12)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities cve-assign (Aug 21)
- Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities Adam Maris (Aug 12)