Debian dla-3340 : libgit2-27 - security update

critical Nessus Plugin ID 171871

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3340 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-3340-1 [email protected] https://www.debian.org/lts/security/ Tobias Frost February 23, 2023 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : libgit2 Version : 0.27.7+dfsg.1-0.2+deb10u1 CVE ID : CVE-2020-12278 CVE-2020-12279 CVE-2023-22742 Debian Bug : 1029368

A vulnerability have been found in libgit2, a cross-platform, linkable library implementation of Git, which may result in remote code execution when cloning a repository on a NTFS-like filesystem or man-in-the-middle attacks due to improper verification of cryptographic Signature.

CVE-2020-12278

An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. path.c mishandles equivalent filenames that exist because of NTFS Alternate Data Streams. This may allow remote code execution when cloning a repository.

CVE-2020-12279

An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. checkout.c mishandles equivalent filenames that exist because of NTFS short names. This may allow remote code execution when cloning a repository

CVE-2023-22742

libgit2 is a cross-platform, linkable library implementation of Git.
When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack.

For Debian 10 buster, these problems have been fixed in version 0.27.7+dfsg.1-0.2+deb10u1.

We recommend that you upgrade your libgit2 packages.

For the detailed security status of libgit2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libgit2

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libgit2-27 packages.

Plugin Details

Severity: Critical

ID: 171871

File Name: debian_DLA-3340.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 2/24/2023

Updated: 1/22/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-12279

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libgit2-27, p-cpe:/a:debian:debian_linux:libgit2-dev

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/23/2023

Vulnerability Publication Date: 4/27/2020

Reference Information

CVE: CVE-2020-12278, CVE-2020-12279, CVE-2023-22742

Detections

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