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List:       oss-security
Subject:    [oss-security] CVE-2011-2724 assignment notification -- samba -- incomplete fix
From:       Jan Lieskovsky <jlieskov () redhat ! com>
Date:       2011-07-29 15:09:13
Message-ID: 4E32CD19.6010608 () redhat ! com
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Hello Josh, Steve, vendors,

   during creation of automated test case for samba CVE-2010-0547 issue 
I have noticed still to be possible mount.cifs to succeed to mount Samba 
share to specially-crafted mount point (containing newline character), 
potentially resulting into mtab corruption (on systems, where glibc 
package was not patched against CVE-2010-0296 flaw yet).

The new CVE identifier of CVE-2011-2724 has been assigned to this issue
(as an incomplete fix for CVE-2010-0547 issue).

Kudos to Tomas Hoger and Jeffrey Layton for their analysis of the issue:

check_mtab() calls check_newline() to check device and directory name.
check_newline() returns EX_USAGE (1) when error is detected, while 
check_mtab() expects -1 to indicate an error.

and to Jeffrey Layton again for providing the patch almost immediately:
[1] http://comments.gmane.org/gmane.linux.kernel.cifs/3827

References:
[2] https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-2724

Thank you && Regards, Jan.
--
Jan iankko Lieskovsky / Red Hat Security Response Team
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