A vulnerability, which was classified as critical, was found in rsyslog up to 8.27.x. Affected is some unknown processing of the component zmq3 Input Handler. The manipulation with an unknown input leads to a format string vulnerability. CWE is classifying the issue as CWE-134. The software uses a function that accepts a format string as an argument, but the format string originates from an external source. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 06/01/2017. The weakness was published 08/06/2017 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2017-12588 since 08/06/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 66 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111879 (Photon OS 1.0: Rsyslog / Shadow PHSA-2017-0030 (deprecated)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family PhotonOS Local Security Checks and running in the context local.

Upgrading to version 8.28.0 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111879).

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• rsyslog

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• open-source

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