Mercurial up to 4.6.0 mpatch.c mpatch_decode input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

A vulnerability was found in Mercurial up to 4.6.0. It has been rated as critical. Affected by this issue is the function mpatch_decode of the file mpatch.c. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity. CVE summarizes:

The mpatch_decode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001.

The bug was discovered 06/06/2018. The weakness was disclosed 07/06/2018 (Website). The advisory is available at mercurial-scm.org. This vulnerability is handled as CVE-2018-13348 since 07/05/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

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). The entries 120480 and 120481 are pretty similar.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111192
Nessus Name: openSUSE Security Update : mercurial (openSUSE-2018-734)
Nessus File: 🔍
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Qualys ID: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Upgrade: Mercurial 4.6.1

Timelineinfo

06/06/2018 🔍
07/05/2018 +28 days 🔍
07/05/2018 +0 days 🔍
07/06/2018 +1 days 🔍
07/06/2018 +0 days 🔍
07/19/2018 +13 days 🔍
07/20/2018 +1 days 🔍
04/03/2023 +1718 days 🔍

Sourcesinfo

Advisory: DLA 2293-1
Status: Not defined

CVE: CVE-2018-13348 (🔍)
See also: 🔍

Entryinfo

Created: 07/06/2018 22:12
Updated: 04/03/2023 19:46
Changes: 07/06/2018 22:12 (73), 02/26/2020 09:36 (2), 04/03/2023 19:46 (4)
Complete: 🔍

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