[Bug 1322] pam_end() is not called if authentication fails, which breaks pam-abl

bugzilla-daemon at bugzilla.mindrot.org bugzilla-daemon at bugzilla.mindrot.org
Mon Jun 18 10:07:57 EST 2007


Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
                 CC|                            |djm at mindrot.org

--- Comment #2 from Damien Miller <djm at mindrot.org>  2007-06-18 10:07:54 ---
DO NOT apply the patch in the Debian bug. It will expose your system to
the signal handler vulnerability fixed in openssh-4.4

This is the "difficult to fix" SIGALRM handler. We could make
sshpam_cleanup() fire if do_cleanup was not called in signal context,
but that would just open a different workaround for password guessers:
make max_auth_tries-1 guesses and keep the connection open until it
times out. 

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