Bug 460476 (CVE-2008-4192)

Summary: CVE-2008-4192 cman/fence: insecure temporary file usage in the egenera fence agent
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: agk, bressers, bstevens, ccaulfie, fdinitto, kreilly, mbroz, mjc
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-05-02 22:38:06 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 469338, 519682, 519689    
Bug Blocks:    

Description Jan Lieskovsky 2008-08-28 11:13:28 UTC
The cman package as shipped with Red Hat Enterprise Linux 5 and within
Fedora release starting from 9 is prone to the symlink attack.

Affected file: /sbin/fence_egenera

Relevant part of the code:

296 sub pserver_shutdown
297 {
298         my $rtrn=1;
299         local *egen_log;
300         open(egen_log,">/tmp/eglog");
301         for (my $trys=0; $trys<20; $trys++)
302         {
303                 last if (pserver_status != 0);
306                 my $status = $_;
. . .


A malicious user could precreate a symlink, pointing to the file /tmp/eglog,
Subsequent run of the '/sbin/egenera' command would destroy / truncate the
target of this link to zero length.


http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496374 (part for cman)

Affected versions:

This issue affects the version of cman package, as shipped with Red Hat
Enteprise Linux 5 and those, shipped within the Fedora release starting from

The cman package as shipped with Red Hat Enteprise Linux 4 Cluster Suite
product and that one, shipped within Fedora release of 8, are not affected
by this issue.

Comment 1 Tomas Hoger 2008-10-13 14:20:29 UTC
This issue also affect Red Hat Cluster Suite for Red Hat Enterprise Linux 4, affected egenera fencing agent is shipped as part of the fence package.

Logging to a file in /tmp was added in following commit:

as part of the fix for bug #251358 / bug #233428.

Comment 2 Fabio Massimo Di Nitto 2008-10-17 12:33:28 UTC
FYI this bug affects also Fedora 9, the all 2.03. stable releases and the 2.99. unstable releases.

A bug fix for 2.99 has been checked in a few minutes ago.

Updates for 2.03 and Fedora will be produced beginning of next week.


Comment 3 Fedora Update System 2008-10-23 16:36:05 UTC
rgmanager-2.03.08-1.fc9, gfs2-utils-2.03.08-1.fc9, cman-2.03.08-1.fc9 has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 errata-xmlrpc 2011-02-16 16:14:13 UTC
This issue has been addressed in following products:

  CLuster Suite for RHEL 4

Via RHSA-2011:0266 https://rhn.redhat.com/errata/RHSA-2011-0266.html

Comment 7 Vincent Danen 2012-05-02 22:38:06 UTC
This was correct in RHEL5 via RHBA-2010:0266.