Tarfile infinite loop during parsing with negative member offset
Vulnerability Description
There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Alexander Urieles
- Seth Larson
- Ethan Furman
- Steve Dower
References
- https://github.com/python/cpython/issues/130577
- https://github.com/python/cpython/pull/137027
- https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/
- https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
- https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe
- https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
- https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f
- https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227
- https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2
- https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19
- https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb
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