Vulnerability identifier: #VU11306

Vulnerability risk: High

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-1000140

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
librelp
Universal components / Libraries / Libraries used by multiple products

Vendor: Rainer Gerhards

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

The weakness exists in the relpTcpChkPeerName function due to insufficient validation of X.509 certificates and improper checks on the return value. A remote attacker can send a specially crafted X.509 certificate, trigger stack-based buffer overflow and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 1.2.15.

Vulnerable software versions

librelp: 0.1.0 - 1.2.14

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External links
http://github.com/rsyslog/librelp/commit/2cfe657672636aa5d7d2a14cfcb0a6ab9d1f00cf

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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?

Yes. This vulnerability is being exploited in the wild.