Bug 460476 - (CVE-2008-4192) CVE-2008-4192 cman/fence: insecure temporary file usage in the egenera fence agent
CVE-2008-4192 cman/fence: insecure temporary file usage in the egenera fence ...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 469338 519682 519689
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Reported: 2008-08-28 07:13 EDT by Jan Lieskovsky
Modified: 2016-03-04 07:22 EST (History)
8 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2012-05-02 18:38:06 EDT
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Jan Lieskovsky 2008-08-28 07:13:28 EDT
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 10:20:29 EDT
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 08:33:28 EDT
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 12:36:05 EDT
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 11:14:13 EST
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 18:38:06 EDT
This was correct in RHEL5 via RHBA-2010:0266.

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