REDHAT-BUG-460476
First published: Thu Aug 28 2008(Updated: )
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); 304 305 306 my $status = $_; . . . Description: 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. References: <a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496374">http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496374</a> (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 9. 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.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat cman | >=5 | |
| Fedora | >=9 |
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Reference Links
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496374
- http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=db7da413
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=251358
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=233428
- https://rhn.redhat.com/errata/RHSA-2011-0266.html
- https://bugzilla.redhat.com/show_bug.cgi?id=460476
Frequently Asked Questions
What is the severity of REDHAT-BUG-460476?
The severity of REDHAT-BUG-460476 is deemed to be medium due to the potential for a symlink attack.
How do I fix REDHAT-BUG-460476?
To fix REDHAT-BUG-460476, ensure that you update the cman package to the latest version that addresses the symlink vulnerability.
What systems are affected by REDHAT-BUG-460476?
REDHAT-BUG-460476 affects Red Hat Enterprise Linux 5 and Fedora releases starting from version 9.
What is a symlink attack in the context of REDHAT-BUG-460476?
A symlink attack refers to the exploitation of symbolic links to manipulate filesystem operations, potentially allowing unauthorized access or modifications.
Are there any workarounds for REDHAT-BUG-460476?
As a workaround for REDHAT-BUG-460476, you can restrict permissions on the affected file /sbin/fence_egenera until a patch is applied.
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