Heap-based buffer overflow in rsyslog - CVE-2011-4623

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Integer overflow in the rsCStrExtendBuf function in runtime/stringbuf.c in the imfile module in rsyslog 4.x before 4.6.6, 5.x before 5.7.4, and 6.x before 6.1.4. A remote attacker can use a large file to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

How to mitigate CVE-2011-4623

External References

• http://bugzilla.adiscon.com/show_bug.cgi?id=221
• http://git.adiscon.com/?p=rsyslog.git;a=commit;h=6bad782f154b7f838c7371bf99c13f6dc4ec4101
• http://rsyslog.com/changelog-for-4-6-6-v4-stable/
• http://rsyslog.com/changelog-for-5-7-4-v5-beta/
• http://rsyslog.com/changelog-for-6-1-4-devel/
• http://secunia.com/advisories/45848
• http://secunia.com/advisories/47698
• http://www.openwall.com/lists/oss-security/2011/12/22/2
• http://www.securityfocus.com/bid/51171
• http://www.securitytracker.com/id?1026556
• http://www.ubuntu.com/usn/USN-1338-1
• https://bugzilla.redhat.com/show_bug.cgi?id=769822

Related Security Bulletins

• Heap-based buffer overflow in rsyslog.com rsyslog
• Amazon Linux AMI update for rsyslog
• Gentoo update for RSYSLOG