A vulnerability was found in Mercurial up to 4.6.0. It has been declared as very critical. Affected by this vulnerability is an unknown code of the file mpatch.c. The manipulation as part of a Integer leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

mpatch.c in Mercurial before 4.6.1 mishandles integer addition and subtraction, aka OVE-20180430-0002.

The bug was discovered 06/06/2018. The weakness was released 07/06/2018 (Website). The advisory is shared at mercurial-scm.org. This vulnerability is known as CVE-2018-13347 since 07/05/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/03/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 29 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111192 (openSUSE Security Update : mercurial (openSUSE-2018-734)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171278 (SUSE Enterprise Linux Security Update for mercurial (SUSE-SU-2018:1990-1)).

Upgrading to version 4.6.1 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 (111192). Entries connected to this vulnerability are available at 120480 and 120482.

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• Mercurial

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6

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