Red Hat Bugzilla – Bug 543153
CVE-2009-4128 grub2: Improper password checking
Last modified: 2011-06-17 16:01:55 EDT
Common Vulnerabilities and Exposures assigned an identifier CVE-2009-4128 to the following vulnerability: GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1. References: ----------- [1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4128 [2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555195 [3] http://www.securityfocus.com/bid/36968 [4] http://xforce.iss.net/xforce/xfdb/54210
While Debian bug report [2] speaks about following commit: * New upstream snapshot. - Fix security problem with password checking. (Closes: #555195) The only relevant auth.c commit I was able to find: bzr branch http://bzr.savannah.gnu.org/r/grub/trunk/grub/ bzr log > /tmp/grub2_bzr.log is this one: <quote> revno: 1805 committer: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com> branch nick: trunk timestamp: Mon 2009-11-09 00:16:17 +0100 message: 2009-11-09 Vladimir Serbinenko <phcoder@gmail.com> * normal/auth.c (grub_auth_strcmp): Fix bug which resulted in function being insecure. </quote> The relevant patch can be retrieved as: bzr diff -r 1804..1805 Also, looks it will need to be tuned up a little bit, as the definition of grub_auth_strcmp() between grub-1.97.1 and trunk has changed.
Created attachment 375176 [details] Local copy of above mentioned bzr diff
Lubomir, Dennis, could you please check above issue and confirm patch mentioned in comment c#2 is the proper one? Once this is confirmed, grub2 package updates should be prepared for Fedora 12 and Fedora Rawhide. Thanks, Jan. -- Jan iankko Lieskovsky / Red Hat Security Response Team
This is fixed in upstream 1.98, which we have in all supported versions of Fedora.