CVE-2021-21300

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.

References

https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592

https://git-scm.com/docs/gitattributes#_filter

https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm

https://lore.kernel.org/git/[email protected]/

https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks

http://www.openwall.com/lists/oss-security/2021/03/09/3

https://lists.fedoraproject.org/archives/list/[email protected]/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/

https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/

https://lists.fedoraproject.org/archives/list/[email protected]/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/

https://support.apple.com/kb/HT212320

http://seclists.org/fulldisclosure/2021/Apr/60

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

http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html

Details

Source: MITRE

Published: 2021-03-09

Updated: 2021-09-23

Type: CWE-59

Risk Information

CVSS v2

Base Score: 5.1

Vector: AV:N/AC:H/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 4.9

Severity: MEDIUM

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.6

Severity: HIGH

Tenable Plugins

View all (23 total)

IDNameProductFamilySeverity
152157SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2021:2555-1)NessusSuSE Local Security Checks
high
152154openSUSE 15 Security Update : git (openSUSE-SU-2021:2555-1)NessusSuSE Local Security Checks
high
151242EulerOS Virtualization 3.0.6.6 : git (EulerOS-SA-2021-2033)NessusHuawei Local Security Checks
high
151172EulerOS Virtualization for ARM 64 3.0.6.0 : git (EulerOS-SA-2021-1998)NessusHuawei Local Security Checks
high
150227EulerOS 2.0 SP9 : git (EulerOS-SA-2021-1923)NessusHuawei Local Security Checks
high
150179EulerOS 2.0 SP9 : git (EulerOS-SA-2021-1944)NessusHuawei Local Security Checks
high
149563EulerOS 2.0 SP8 : git (EulerOS-SA-2021-1870)NessusHuawei Local Security Checks
high
149540EulerOS 2.0 SP5 : git (EulerOS-SA-2021-1897)NessusHuawei Local Security Checks
high
149221GLSA-202104-01 : Git: User-assisted execution of arbitrary codeNessusGentoo Local Security Checks
high
148193Amazon Linux 2 : git (ALAS-2021-1621)NessusAmazon Linux Local Security Checks
high
148131Amazon Linux AMI : git (ALAS-2021-1490)NessusAmazon Linux Local Security Checks
high
148030Photon OS 4.0: Git PHSA-2021-4.0-0004NessusPhotonOS Local Security Checks
high
148010Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Git vulnerability (USN-4761-1)NessusUbuntu Local Security Checks
high
147825Photon OS 1.0: Git PHSA-2021-1.0-0369NessusPhotonOS Local Security Checks
high
147824Photon OS 2.0: Git PHSA-2021-2.0-0327NessusPhotonOS Local Security Checks
high
147821Photon OS 3.0: Git PHSA-2021-3.0-0207NessusPhotonOS Local Security Checks
high
147815Fedora 32 : git (2021-ffd0b2108d)NessusFedora Local Security Checks
high
147799openSUSE Security Update : git (openSUSE-2021-405)NessusSuSE Local Security Checks
high
147749Security Updates for Microsoft Visual Studio Products (March 2021)NessusWindows : Microsoft Bulletins
high
147742Fedora 33 : git (2021-63fcbd126e)NessusFedora Local Security Checks
high
147737Slackware 14.0 / 14.1 / 14.2 / current : git (SSA:2021-070-01)NessusSlackware Local Security Checks
high
147564SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2021:0757-1)NessusSuSE Local Security Checks
high
147436SUSE SLES12 Security Update : git (SUSE-SU-2021:0756-1)NessusSuSE Local Security Checks
high