Vulnerability identifier: #VU32854

Vulnerability risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C]

CVE-ID: CVE-2011-3200

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
rsyslog
Server applications / Other server solutions

Vendor: rsyslog.com

Description

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

The vulnerability exists due to a boundary error when processing a long TAG in a legacy syslog message. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Mitigation
Update to version 4.6.8.

Vulnerable software versions

rsyslog: 4.6.0 - 4.6.7

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External links
http://git.adiscon.com/?p=rsyslog.git;a=commit;h=1ca6cc236d1dabf1633238b873fb1c057e52f95e
http://lists.fedoraproject.org/pipermail/package-announce/2011-September/065837.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-September/065941.html
http://lists.opensuse.org/opensuse-updates/2011-09/msg00013.html
http://secunia.com/advisories/45922
http://secunia.com/advisories/46027
http://securitytracker.com/id?1026000
http://www.mandriva.com/security/advisories?name=MDVSA-2011:134
http://www.redhat.com/support/errata/RHSA-2011-1247.html
http://www.rsyslog.com/potential-dos-with-malformed-tag/
http://www.securityfocus.com/bid/49413
http://bugzilla.redhat.com/show_bug.cgi?id=727644

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.