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Gentoo Linux Security Advisory                           GLSA 202104-01
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: Git: User-assisted execution of arbitrary code
      Date: April 30, 2021
      Bugs: #774678
        ID: 202104-01

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Synopsis
=======
A vulnerability has been found in Git that could allow a remote
attacker to execute arbitrary code.

Background
=========
Git is a distributed version control system designed.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  dev-vcs/git                  < 2.26.3                  >= 2.26.3

Description
==========
It was discovered that Git could be fooled into running remote code
during a clone on case-insensitive file systems with support for
symbolic links, if Git is configured globally to apply delay-capable
clean/smudge filters (such as Git LFS).

Impact
=====
A remote attacker could entice a user to clone a specially crafted
repository, possibly resulting in the remote execution of arbitrary
code with the privileges of the user running the application.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Git users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=dev-vcs/git-2.26.3"

References
=========
[ 1 ] CVE-2021-21300
       https://nvd.nist.gov/vuln/detail/CVE-2021-21300

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202104-01

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/