tarfile `data`/`tar` filter bypass via hard link to a symlink
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@StanFromIreland 已經在處理了。
開始於 2026年9月8日。
3.10
3.11
3.12
3.13
stdlib
type-security
- 主要語言
- Python
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- PR 合併指標
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描述
On CPython 3.13.15 for Linux, an attacker-controlled tar archive extracted with the tar or data filter can make tarfile change the permissions and modification time of an existing file outside the extraction directory. The archive also leaves a path inside the extracted tree that resolves to the outside file. Opening that path returns the outside file's content.
This was incidentally fixed by https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca for 3.14+ which changed os.link to use AT_SYMLINK_FOLLOW.
Linked PRs
- gh-157191
- gh-157192
- gh-157261
- gh-157262
- gh-157454
貢獻指南
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