libgit2 up to 0.26.1 index.c read_entry double free

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in libgit2 up to 0.26.1. This issue affects the function read_entry of the file index.c. The manipulation results in double free. This vulnerability is reported as CVE-2018-8099. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in libgit2 up to 0.26.1. Affected is the function read_entry of the file index.c. The manipulation with an unknown input leads to a double free vulnerability. CWE is classifying the issue as CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. This is going to have an impact on availability. CVE summarizes:

Incorrect returning of an error code in the index.c:read_entry() function leads to a double free in libgit2 before v0.26.2, which allows an attacker to cause a denial of service via a crafted repository index file.

The bug was discovered 03/08/2018. The weakness was disclosed 03/14/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2018-8099 since 03/13/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118486 (openSUSE Security Update : libgit2 (openSUSE-2018-1314)), 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 171683 (SUSE Enterprise Linux Security Update for libgit2 (SUSE-SU-2018:3440-1)).

Upgrading to version 0.26.2 eliminates this vulnerability. A possible mitigation has been published 9 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (118486) and SecurityFocus (BID 104345†). The entries VDB-118361, VDB-121131, VDB-121132 and VDB-123017 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 3.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118486
Nessus Name: openSUSE Security Update : libgit2 (openSUSE-2018-1314)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: libgit2 0.26.2
Patch: github.com

Timelineinfo

03/08/2018 🔍
03/13/2018 +5 days 🔍
03/13/2018 +0 days 🔍
03/14/2018 +1 days 🔍
03/14/2018 +0 days 🔍
05/30/2018 +77 days 🔍
10/26/2018 +149 days 🔍
10/29/2018 +3 days 🔍
02/21/2023 +1576 days 🔍

Sourcesinfo

Product: github.com

Advisory: 58a6fe94cb851f71214dbefac3f9bffee437d6fe
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-8099 (🔍)
GCVE (CVE): GCVE-0-2018-8099
GCVE (VulDB): GCVE-100-114492
SecurityFocus: 104345 - Git CVE-2018-11235 Arbitrary Code Execution Vulnerability

See also: 🔍

Entryinfo

Created: 03/14/2018 09:38
Updated: 02/21/2023 17:31
Changes: 03/14/2018 09:38 (68), 01/13/2020 09:56 (12), 02/21/2023 17:23 (5), 02/21/2023 17:31 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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