Amazon Linux 2 : git (ALAS-2020-1416)

high Nessus Plugin ID 136360

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 2.23.3-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2020-1416 advisory.

Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar toCVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker cannot control which one). Git uses external credential helper programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are considered illegal as of the recently published Git versions can cause Git to send a blank pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and will return some unspecified stored password, leaking the password to an attacker's server. The vulnerability can be triggered by feeding a malicious URL to `git clone`. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Git's store helper - Git's cache helper - the osxkeychain helper that ships in Git's contrib directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability. (CVE-2020-11008)

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

Note that Nessus has not tested for this issue 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://access.redhat.com/security/cve/CVE-2020-11008

https://alas.aws.amazon.com/AL2/ALAS-2020-1416.html

Plugin Details

Severity: High

ID: 136360

File Name: al2_ALAS-2020-1416.nasl

Version: 1.4

Type: local

Agent: unix

Published: 5/7/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2020-11008

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/6/2020

Vulnerability Publication Date: 4/21/2020

Reference Information

CVE: CVE-2020-11008

ALAS: 2020-1416