CVE-2023-6597

An issue was found in the CPython tempfile.TemporaryDirectory class affecting versions 3.12.1, 3.11.7, 3.10.13, 3.9.18, and 3.8.18 and prior.

The tempfile.TemporaryDirectory class would dereference symlinks during cleanup of permissions-related errors. This means users which can run privileged programs are potentially able to modify permissions of files referenced by symlinks in some circumstances.

References

• http://www.openwall.com/lists/oss-security/2024/03/20/5
• https://github.com/python/cpython/commit/02a9259c717738dfe6b463c44d7e17f2b6d2cb3a
• https://github.com/python/cpython/commit/5585334d772b253a01a6730e8202ffb1607c3d25
• https://github.com/python/cpython/commit/6ceb8aeda504b079fef7a57b8d81472f15cdd9a5
• https://github.com/python/cpython/commit/81c16cd94ec38d61aa478b9a452436dc3b1b524d
• https://github.com/python/cpython/commit/8eaeefe49d179ca4908d052745e3bb8b6f238f82
• https://github.com/python/cpython/commit/d54e22a669ae6e987199bb5d2c69bb5a46b0083b
• https://github.com/python/cpython/issues/91133
• https://lists.debian.org/debian-lts-announce/2024/03/msg00025.html
• https://mail.python.org/archives/list/security-announce@python.org/thread/Q5C6ATFC67K53XFV4KE45325S7NS62LD/