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CVE-2021-21300— malicious repositories can execute remote code while cloning

Quick assessment

Affected
git git
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Git是一套免费、开源的分布式版本控制系统。 Git 存在后置链接漏洞，该漏洞允许攻击者利用特别制作的存储库导致just-checked脚本执行而克隆到一个不区分大小写的文件系统。

CVSS 8.0 · High EPSS 88.53% · P100

Public Exploits 1

Metasploit · 1 git_lfs_clone_command_exec.rb [exploit]
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I. Basic Information for CVE-2021-21300

Vulnerability Information
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Vulnerability Title
malicious repositories can execute remote code while cloning
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Git 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Git是一套免费、开源的分布式版本控制系统。 Git 存在后置链接漏洞，该漏洞允许攻击者利用特别制作的存储库导致just-checked脚本执行而克隆到一个不区分大小写的文件系统。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
git git >= 2.14.2, < 2.17.62.17.6 -

II. Public POCs for CVE-2021-21300

# POC Description Source Link Shenlong Link
1 None https://github.com/AlkenePan/CVE-2021-21300 POC Details
2 None https://github.com/Faisal78123/CVE-2021-21300 POC Details
3 None https://github.com/erranfenech/CVE-2021-21300 POC Details
4 None https://github.com/Maskhe/CVE-2021-21300 POC Details
5 remote code exec for git https://github.com/1uanWu/CVE-2021-21300 POC Details
6 None https://github.com/Kirill89/CVE-2021-21300 POC Details
7 None https://github.com/ETOCheney/cve-2021-21300 POC Details
8 None https://github.com/fengzhouc/CVE-2021-21300 POC Details
9 None https://github.com/danshuizhangyu/CVE-2021-21300 POC Details
10 None https://github.com/0ahu/CVE-2021-21300 POC Details
11 None https://github.com/Jiang59991/cve-2021-21300 POC Details
12 None https://github.com/Jiang59991/cve-2021-21300-plus POC Details
13 None https://github.com/macilin/CVE-2021-21300 POC Details
14 the payload of CVE-2021-21300 https://github.com/Roboterh/CVE-2021-21300 POC Details
15 CVE-2021-21300 https://github.com/henry861010/Network_Security_NYCU POC Details
16 None https://github.com/Saboor-Hakimi-23/CVE-2021-21300 POC Details
17 None https://github.com/Threekiii/Awesome-POC/blob/master/%E5%85%B6%E4%BB%96%E6%BC%8F%E6%B4%9E/Git%20for%20Visual%20Studio%E8%BF%9C%E7%A8%8B%E6%89%A7%E8%A1%8C%E4%BB%A3%E7%A0%81%E6%BC%8F%E6%B4%9E%20CVE-2021-21300.md POC Details
18 None https://github.com/Sizvy/CVE-2021-21300 POC Details
19 CVE-2021-21300 test https://github.com/the-chivalrousZ/cve-2021-21300 POC Details
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III. Intelligence Information for CVE-2021-21300

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Patches & Fixes for CVE-2021-21300 (1)

Vendor Advisories for CVE-2021-21300 (3)

Exploits & Public PoCs for CVE-2021-21300 (1)

Mailing List Discussions for CVE-2021-21300 (6)

Other References for CVE-2021-21300 (3)

IV. Related Vulnerabilities

Same product: git
Same vendor: git
Same weakness: CWE-59

V. Comments for CVE-2021-21300

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