8.0
HIGH
CVE-2021-21300
Git Symbolic Link Execution Vulnerability
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.

INFO

Published Date :

March 9, 2021, 8:15 p.m.

Last Modified :

Nov. 7, 2023, 3:29 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.8

Exploitability Score :

1.6
Public PoC/Exploit Available at Github

CVE-2021-21300 has a 37 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-21300 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Debian debian_linux
1 Git git
1 Apple xcode
1 Git-scm git
: Total Affected Vendor : 5 | Products : 5
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-21300.

URL Resource
http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html Exploit Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2021/Apr/60 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/03/09/3 Exploit Mailing List Third Party Advisory
https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks Vendor Advisory
https://git-scm.com/docs/gitattributes#_filter Vendor Advisory
https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592 Patch Third Party Advisory
https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/
https://security.gentoo.org/glsa/202104-01 Third Party Advisory
https://support.apple.com/kb/HT212320 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 3 weeks ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 6 months ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
lions2012/Penetration_Testing_POC

渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypass oa-getshell cve-cms

Assembly Python Shell PHP C++ C Go Ruby HTML Java

Updated: 1 month, 2 weeks ago
4 stars 0 fork 0 watcher
Born at : Feb. 7, 2024, 2:08 p.m. This repo has been linked 305 different CVEs too.
Profile Photo
d4n-sec/d4n-sec.github.io

None

CSS HTML JavaScript

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 2, 2024, 2:11 p.m. This repo has been linked 494 different CVEs too.
Profile Photo
Saboor-Hakimi-23/CVE-2021-21300

None

Shell

Updated: 10 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Oct. 28, 2023, 10:17 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
ArrestX/--POC

poc集合(持续更新ing)

Updated: 4 months, 1 week ago
4 stars 0 fork 0 watcher
Born at : July 30, 2023, 1:30 a.m. This repo has been linked 154 different CVEs too.
Profile Photo
0day404/vulnerability-poc

A Common Vulnerability PoC Knowledge Base一个普遍漏洞POC知识库

vulnerability

Updated: 2 months ago
17 stars 6 fork 6 watcher
Born at : June 24, 2023, 3:12 p.m. This repo has been linked 232 different CVEs too.
Profile Photo
9069332997/session-1-full-stack

zomotoa food app

Updated: 1 year, 3 months ago
0 stars 0 fork 0 watcher
Born at : June 9, 2023, 7:24 a.m. This repo has been linked 39 different CVEs too.
Profile Photo
henry861010/Network_Security_NYCU

CVE-2021-21300

Shell

Updated: 1 year, 3 months ago
0 stars 0 fork 0 watcher
Born at : May 4, 2023, 7:46 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
whoforget/CVE-POC

None

Updated: 1 year, 5 months ago
0 stars 2 fork 2 watcher
Born at : April 8, 2023, 6:19 a.m. This repo has been linked 923 different CVEs too.
Profile Photo
k0mi-tg/CVE-POC

None

Updated: 7 months ago
20 stars 3 fork 3 watcher
Born at : Feb. 14, 2023, 6:10 p.m. This repo has been linked 921 different CVEs too.
Profile Photo
teresaweber685/book_list

工具书单

Perl Shell

Updated: 1 year, 7 months ago
0 stars 0 fork 0 watcher
Born at : Feb. 7, 2023, 6:29 a.m. This repo has been linked 20 different CVEs too.
Profile Photo
WhooAmii/POC_to_review

None

Updated: 6 months, 4 weeks ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
xuetusummer/Penetration_Testing_POC

None

Assembly Python Shell PHP C++ C Go Ruby HTML Java

Updated: 1 month, 4 weeks ago
6 stars 3 fork 3 watcher
Born at : Nov. 25, 2022, 2:30 a.m. This repo has been linked 270 different CVEs too.
Profile Photo
Roboterh/CVE-2021-21300

the payload of CVE-2021-21300

Shell Perl

Updated: 2 years, 1 month ago
0 stars 0 fork 0 watcher
Born at : Aug. 13, 2022, 1 p.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-21300 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-21300 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference GitHub, Inc. https://lore.kernel.org/git/xmqqim6019yd.fsf%40gitster.c.googlers.com/ [No types assigned]
    Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/ [No types assigned]
    Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ [No types assigned]
    Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/ [No types assigned]
    Removed Reference GitHub, Inc. https://lore.kernel.org/git/[email protected]/
    Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/
    Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/
    Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/
  • Modified Analysis by [email protected]

    Dec. 06, 2022

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html Mailing List, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Oct. 11, 2022

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html [No Types Assigned]
  • Modified Analysis by [email protected]

    Sep. 23, 2021

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html No Types Assigned http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html Exploit, Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Aug. 31, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html [No Types Assigned]
  • Modified Analysis by [email protected]

    May. 05, 2021

    Action Type Old Value New Value
    Changed Reference Type http://seclists.org/fulldisclosure/2021/Apr/60 No Types Assigned http://seclists.org/fulldisclosure/2021/Apr/60 Mailing List, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202104-01 No Types Assigned https://security.gentoo.org/glsa/202104-01 Third Party Advisory
  • CVE Modified by [email protected]

    May. 01, 2021

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202104-01 [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 27, 2021

    Action Type Old Value New Value
    Added Reference http://seclists.org/fulldisclosure/2021/Apr/60 [No Types Assigned]
  • Modified Analysis by [email protected]

    Apr. 27, 2021

    Action Type Old Value New Value
    Changed Reference Type https://support.apple.com/kb/HT212320 No Types Assigned https://support.apple.com/kb/HT212320 Third Party Advisory
    Added CPE Configuration AND OR *cpe:2.3:a:apple:xcode:*:*:*:*:*:*:*:* versions up to (excluding) 12.5 OR cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0
  • CVE Modified by [email protected]

    Apr. 26, 2021

    Action Type Old Value New Value
    Added Reference https://support.apple.com/kb/HT212320 [No Types Assigned]
  • Modified Analysis by [email protected]

    Mar. 26, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ Third Party Advisory https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ Mailing List, Third Party Advisory
    Changed CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 19, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/BBPNGLQSYJHLZZ37BO42YY6S5OTIF4L4/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Mar. 16, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:H/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/03/09/3 No Types Assigned http://www.openwall.com/lists/oss-security/2021/03/09/3 Exploit, Mailing List, Third Party Advisory
    Changed Reference Type https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592 No Types Assigned https://github.com/git/git/commit/684dd4c2b414bcf648505e74498a608f28de4592 Patch, Third Party Advisory
    Changed Reference Type https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm No Types Assigned https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm Third Party Advisory
    Changed Reference Type https://git-scm.com/docs/gitattributes#_filter No Types Assigned https://git-scm.com/docs/gitattributes#_filter Vendor Advisory
    Changed Reference Type https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks No Types Assigned https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks Vendor Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/ Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ Third Party Advisory
    Changed Reference Type https://lore.kernel.org/git/[email protected]/ No Types Assigned https://lore.kernel.org/git/[email protected]/ Release Notes, Third Party Advisory
    Added CWE NIST CWE-59
    Added CPE Configuration OR *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions up to (including) 2.14.2 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.17.0 up to (excluding) 2.17.6 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.18.0 up to (excluding) 2.18.5 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.19.0 up to (excluding) 2.19.6 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.20.0 up to (excluding) 2.20.5 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.21.0 up to (excluding) 2.21.4 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.22.0 up to (excluding) 2.22.5 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.23.0 up to (excluding) 2.23.4 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.24.0 up to (excluding) 2.24.4 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.25.0 up to (excluding) 2.25.5 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.26.0 up to (excluding) 2.26.3 *cpe:2.3:a:git-scm:git:2.27.0:*:*:*:*:*:*:* *cpe:2.3:a:git-scm:git:2.28.0:*:*:*:*:*:*:* *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.29.0 up to (excluding) 2.29.3 *cpe:2.3:a:git-scm:git:*:*:*:*:*:*:*:* versions from (including) 2.30.0 up to (excluding) 2.30.2
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 15, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/LMXX2POK5X576BSDWSXGU7EIK6I72ERU/ [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 12, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/LCLJJLKKMS5WRFO6C475AOUZTWQLIARX/ [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 10, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/03/09/3 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-21300 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-21300 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

89.54 }} -0.03%

score

0.98834

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: