oss-sec mailing list archives
Re: CVE Request for OpenSSH vulnerability - authentication limits bypass
From: mancha <mancha1 () zoho com>
Date: Wed, 22 Jul 2015 23:07:05 +0000
Attached patch fixes. --mancha On Tue, Jul 21, 2015 at 11:16:35AM +0200, king cope wrote:
Hello list, solar designer, Can you please add a CVE for the mentioned vulnerability in OpenSSH. The OpenSSH server normally wouldn't allow successive authentications that exceed the MaxAuthTries setting in sshd_config, with this vulnerability the allowed login retries can be extended limited only by the LoginGraceTime setting, that can be more than 10000 tries (depends on the network speed), and even more for local attacks. Technically this vulnerability affects OpenSSH. It can be found with FreeBSD installations because these use the keyboard-interactive authentication mechanism (that is the one affected) in combination with pam. I haven't tested skey/bsd auth. To note that this vulnerability looks pretty old, a test against FreeBSD 6.2 (2007 release date) showed it vulnerable. Additionally there is no delay between the authentication retries, but this is another issue that makes this vulnerability more effective. CVE please! Thank you, KC Reference: http://seclists.org/fulldisclosure/2015/Jul/92
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openssl-6.9p1_kbd-interactive.diff
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Current thread:
- CVE Request for OpenSSH vulnerability - authentication limits bypass king cope (Jul 21)
- Re: CVE Request for OpenSSH vulnerability - authentication limits bypass Jason A. Donenfeld (Jul 22)
- Re: CVE Request for OpenSSH vulnerability - authentication limits bypass mancha (Jul 22)
- Re: CVE Request for OpenSSH vulnerability - authentication limits bypass cve-assign (Jul 22)