#VU43478 Heap-based buffer overflow in rsyslog - CVE-2011-4623

Vulnerability identifier: #VU43478

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2011-4623

CWE-ID: CWE-122

Exploitation vector: Local

Exploit availability: No

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 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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

rsyslog: 4.1.0 - 6.1.3

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

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.