Detections
Analytics

Amazon Linux 2 : git (ALAS-2022-1886)

high Nessus Plugin ID 168442

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of git installed on the remote host is prior to 2.38.1-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2022-1886 advisory.

 - Git is an open source, scalable, distributed revision control system. Versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 are subject to exposure of sensitive information to a malicious actor. When performing a local clone (where the source and target of the clone are on the same volume), Git copies the contents of the source's `$GIT_DIR/objects` directory into the destination by either creating hardlinks to the source contents, or copying them (if hardlinks are disabled via `--no- hardlinks`). A malicious actor could convince a victim to clone a repository with a symbolic link pointing at sensitive information on the victim's machine. This can be done either by having the victim clone a malicious repository on the same machine, or having them clone a malicious repository embedded as a bare repository via a submodule from any source, provided they clone with the `--recurse-submodules` option.
 Git does not create symbolic links in the `$GIT_DIR/objects` directory. The problem has been patched in the versions published on 2022-10-18, and backported to v2.30.x. Potential workarounds: Avoid cloning untrusted repositories using the `--local` optimization when on a shared machine, either by passing the `--no-local` option to `git clone` or cloning from a URL that uses the `file://` scheme. Alternatively, avoid cloning repositories from untrusted sources with `--recurse-submodules` or run `git config --global protocol.file.allow user`. (CVE-2022-39253)

 - Git is an open source, scalable, distributed revision control system. `git shell` is a restricted login shell that can be used to implement Git's push/pull functionality via SSH. In versions prior to 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4, the function that splits the command arguments into an array improperly uses an `int` to represent the number of entries in the array, allowing a malicious actor to intentionally overflow the return value, leading to arbitrary heap writes. Because the resulting array is then passed to `execv()`, it is possible to leverage this attack to gain remote code execution on a victim machine. Note that a victim must first allow access to `git shell` as a login shell in order to be vulnerable to this attack. This problem is patched in versions 2.30.6, 2.31.5, 2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 and users are advised to upgrade to the latest version.
 Disabling `git shell` access via remote logins is a viable short-term workaround. (CVE-2022-39260)

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

Solution

Run 'yum update git' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2022-1886.html

https://alas.aws.amazon.com/cve/html/CVE-2022-39253.html

https://alas.aws.amazon.com/cve/html/CVE-2022-39260.html

Plugin Details

Severity: High

ID: 168442

File Name: al2_ALAS-2022-1886.nasl

Version: 1.2

Type: local

Agent: unix

Published: 12/7/2022

Updated: 12/7/2022

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2022-39260

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:git-subtree, p-cpe:/a:amazon:linux:git-svn, p-cpe:/a:amazon:linux:gitweb, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:gitk, p-cpe:/a:amazon:linux:git-instaweb, p-cpe:/a:amazon:linux:git-credential-libsecret, p-cpe:/a:amazon:linux:git-daemon, p-cpe:/a:amazon:linux:git-all, p-cpe:/a:amazon:linux:git-debuginfo, p-cpe:/a:amazon:linux:git-p4, p-cpe:/a:amazon:linux:git-core-doc, p-cpe:/a:amazon:linux:perl-git, p-cpe:/a:amazon:linux:git-cvs, p-cpe:/a:amazon:linux:git-core, p-cpe:/a:amazon:linux:git-email, p-cpe:/a:amazon:linux:git, p-cpe:/a:amazon:linux:git-gui, p-cpe:/a:amazon:linux:perl-git-svn

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 12/1/2022

Vulnerability Publication Date: 10/18/2022

Reference Information

CVE: CVE-2022-39253, CVE-2022-39260