CVE-2024-0397

Advisory

A defect was discovered in the Python “ssl” module where there is a memory race condition with the ssl.SSLContext methods “cert_store_stats()” and “get_ca_certs()”. The race condition can be triggered if the methods are called at the same time as certificates are loaded into the SSLContext, such as during the TLS handshake with a certificate directory configured.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

A defect was discovered in the Python “ssl” module where there is a memory race condition with the ssl.SSLContext methods “cert_store_stats()” and “get_ca_certs()”. The race condition can be triggered if the methods are called at the same time as certificates are loaded into the SSLContext, such as during the TLS handshake with a certificate directory configured. This issue is fixed in CPython 3.10.14, 3.11.9, 3.12.3, and 3.13.0a5. See CVE-2024-0397.


MISC:https://github.com/python/cpython/commit/01c37f1d0714f5822d34063ca7180b595abf589d: https://github.com/python/cpython/commit/01c37f1d0714f5822d34063ca7180b595abf589d
MISC:https://github.com/python/cpython/commit/29c97287d205bf2f410f4895ebce3f43b5160524: https://github.com/python/cpython/commit/29c97287d205bf2f410f4895ebce3f43b5160524
MISC:https://github.com/python/cpython/commit/37324b421b72b7bc9934e27aba85d48d4773002e: https://github.com/python/cpython/commit/37324b421b72b7bc9934e27aba85d48d4773002e
MISC:https://github.com/python/cpython/commit/542f3272f56f31ed04e74c40635a913fbc12d286: https://github.com/python/cpython/commit/542f3272f56f31ed04e74c40635a913fbc12d286
MISC:https://github.com/python/cpython/commit/b228655c227b2ca298a8ffac44d14ce3d22f6faa: https://github.com/python/cpython/commit/b228655c227b2ca298a8ffac44d14ce3d22f6faa
MISC:https://github.com/python/cpython/commit/bce693111bff906ccf9281c22371331aaff766ab: https://github.com/python/cpython/commit/bce693111bff906ccf9281c22371331aaff766ab
MISC:https://github.com/python/cpython/issues/114572: https://github.com/python/cpython/issues/114572
MISC:https://github.com/python/cpython/pull/114573: https://github.com/python/cpython/pull/114573
MISC:https://mail.python.org/archives/list/[email protected]/thread/BMAK5BCGKYWNJOACVUSLUF6SFGBIM4VP/: https://mail.python.org/archives/list/[email protected]/thread/BMAK5BCGKYWNJOACVUSLUF6SFGBIM4VP/
MLIST:[oss-security] 20240617 Fwd: [Security-announce][CVE-2024-0397] Memory race condition in ssl.SSLContext certificate store methods: http://www.openwall.com/lists/oss-security/2024/06/17/2

Resources

• https://github.com/python/cpython/commit/01c37f1d0714f5822d34063ca7180b595abf589d
• https://github.com/python/cpython/commit/29c97287d205bf2f410f4895ebce3f43b5160524
• https://github.com/python/cpython/commit/37324b421b72b7bc9934e27aba85d48d4773002e
• https://github.com/python/cpython/commit/542f3272f56f31ed04e74c40635a913fbc12d286
• https://github.com/python/cpython/commit/b228655c227b2ca298a8ffac44d14ce3d22f6faa
• https://github.com/python/cpython/commit/bce693111bff906ccf9281c22371331aaff766ab
• https://github.com/python/cpython/issues/114572
• https://github.com/python/cpython/pull/114573
• https://mail.python.org/archives/list/[email protected]/thread/BMAK5BCGKYWNJOACVUSLUF6SFGBIM4VP/
• http://www.openwall.com/lists/oss-security/2024/06/17/2
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0397