#VU22771 Buffer overflow in rsyslog - CVE-2019-17042

Vulnerability identifier: #VU22771

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-17042

CWE-ID: CWE-119

Exploitation vector: Network

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 in "contrib/pmcisconames/pmcisconames.c" due to a boundary error in the parser for Cisco log messages. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

rsyslog: 8.1908.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-11/msg00031.html
https://github.com/rsyslog/rsyslog/blob/v8-stable/ChangeLog
https://github.com/rsyslog/rsyslog/pull/3883

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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.