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Amazon Linux AMI : (ALAS-2023-1679)

critical Nessus Plugin ID 171055

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Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1679 advisory.

 - Git is distributed revision control system. gitattributes are a mechanism to allow defining attributes for paths. These attributes can be defined by adding a `.gitattributes` file to the repository, which contains a set of file patterns and the attributes that should be set for paths matching this pattern. When parsing gitattributes, multiple integer overflows can occur when there is a huge number of path patterns, a huge number of attributes for a single pattern, or when the declared attribute names are huge. These overflows can be triggered via a crafted `.gitattributes` file that may be part of the commit history. Git silently splits lines longer than 2KB when parsing gitattributes from a file, but not when parsing them from the index. Consequentially, the failure mode depends on whether the file exists in the working tree, the index or both. This integer overflow can result in arbitrary heap reads and writes, which may result in remote code execution. The problem has been patched in the versions published on 2023-01-17, going back to v2.30.7. Users are advised to upgrade. There are no known workarounds for this issue. (CVE-2022-23521)

 - Git is distributed revision control system. `git log` can display commits in an arbitrary format using its `--format` specifiers. This functionality is also exposed to `git archive` via the `export-subst` gitattribute. When processing the padding operators, there is a integer overflow in `pretty.c::format_and_pad_commit()` where a `size_t` is stored improperly as an `int`, and then added as an offset to a `memcpy()`. This overflow can be triggered directly by a user running a command which invokes the commit formatting machinery (e.g., `git log --format=...`). It may also be triggered indirectly through git archive via the export-subst mechanism, which expands format specifiers inside of files within the repository during a git archive. This integer overflow can result in arbitrary heap writes, which may result in arbitrary code execution. The problem has been patched in the versions published on 2023-01-17, going back to v2.30.7. Users are advised to upgrade. Users who are unable to upgrade should disable `git archive` in untrusted repositories. If you expose git archive via `git daemon`, disable it by running `git config --global daemon.uploadArch false`. (CVE-2022-41903)

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

Solution

pkg_manager = 'yum'Run ' update git' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2023-1679.html

https://alas.aws.amazon.com/cve/html/CVE-2022-23521.html

https://alas.aws.amazon.com/cve/html/CVE-2022-41903.html

Plugin Details

Severity: Critical

ID: 171055

File Name: ala_ALAS-2023-1679.nasl

Version: 1.0

Type: local

Agent: unix

Published: 2/6/2023

Updated: 2/6/2023

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, 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-2022-41903

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: p-cpe:/a:amazon:linux:emacs-git, p-cpe:/a:amazon:linux:emacs-git-el, p-cpe:/a:amazon:linux:git, p-cpe:/a:amazon:linux:git-all, p-cpe:/a:amazon:linux:git-bzr, p-cpe:/a:amazon:linux:git-core, p-cpe:/a:amazon:linux:git-core-doc, p-cpe:/a:amazon:linux:git-cvs, p-cpe:/a:amazon:linux:git-daemon, p-cpe:/a:amazon:linux:git-debuginfo, p-cpe:/a:amazon:linux:git-email, p-cpe:/a:amazon:linux:git-hg, p-cpe:/a:amazon:linux:git-instaweb, p-cpe:/a:amazon:linux:git-p4, p-cpe:/a:amazon:linux:git-subtree, p-cpe:/a:amazon:linux:git-svn, p-cpe:/a:amazon:linux:gitweb, p-cpe:/a:amazon:linux:perl-git, p-cpe:/a:amazon:linux:perl-git-svn, cpe:/o:amazon:linux

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/31/2023

Vulnerability Publication Date: 1/17/2023

Reference Information

CVE: CVE-2022-23521, CVE-2022-41903