Description

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.

Classification

CVE ID: CVE-2024-0397

CVSS Base Severity: HIGH

CVSS Base Score: 7.4

Affected Products

Vendor: Python Software Foundation

Product: CPython

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.39% (probability of being exploited)

EPSS Percentile: 59.19% (scored less or equal to compared to others)

EPSS Date: 2025-04-20 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: total

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-0397
https://github.com/python/cpython/issues/114572
https://github.com/python/cpython/pull/114573
https://mail.python.org/archives/list/[email protected]/thread/BMAK5BCGKYWNJOACVUSLUF6SFGBIM4VP/
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
http://www.openwall.com/lists/oss-security/2024/06/17/2

Timeline