Description (CNA)
A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns a different context to SSLSocket.context (the documented way to select a certificate per server name) and nothing else keeps the original ssl.SSLContext alive. Typical cases are servers that create an SSLContext per connection or replace it while connections are open; servers that wrap their listening socket with it are not affected. Mitigation: keep a reference to every SSLContext that sets sni_callback for the lifetime of the server. TLS clients are not affected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Python Software Foundation / CPython | affected 0 before 3.10.22; affected 3.11.0 before 3.11.17; affected 3.12.0 before 3.12.15; affected 3.13.0 before 3.13.16; affected 3.14.0 before 3.14.8; affected 3.15.0a1 before 3.15.0rc3 |
CWE
CWE-416
References
- https://github.com/python/cpython/pull/158504
- https://mail.python.org/archives/list/security-announce@python.org/thread/QMQIUQB6WGGC3MI7I3WKQXOYOBDSPPS3/
- https://github.com/python/cpython/issues/156293
- https://github.com/python/cpython/commit/34a53dce8174da2fceb12fe084a4def02a10053d
- https://github.com/python/cpython/commit/46133cd57d309652139ada74014aca7665ac552b
- https://github.com/python/cpython/commit/63fab143d94cafae71850831acfb52041ba44af7
- https://github.com/python/cpython/commit/cd7e51e7d4563866fbaa1e2521ae69b45daf3698
- https://github.com/python/cpython/commit/d8717ed01717a9641686e6e6f83f0ab8af235e2c
- https://github.com/python/cpython/commit/b12968cefe69ca1dcb8606c832ff73ee7dbf4ba8
- https://github.com/python/cpython/commit/ec44b5a3258cbda947d5e07242ee562ed05ef24b
ADP enrichment
No English description supplied.