CPython 3.9 and earlier doesnt disallow configuring an empty list ([]) for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | RedHat | python39:3.9-8100020251126112422.d47b87a4 | * |
| Red Hat Enterprise Linux 8 | RedHat | python39-devel:3.9-8100020251126112422.d47b87a4 | * |
| Red Hat Enterprise Linux 9 | RedHat | python3.9-0:3.9.25-2.el9_7 | * |
| Red Hat Enterprise Linux 9 | RedHat | python3.9-0:3.9.25-2.el9_7 | * |
| Red Hat Ceph Storage 8 | RedHat | rhceph/rhceph-8-rhel9:1769512383 | * |
| Red Hat Discovery 2 | RedHat | discovery/discovery-server-rhel9:1767888970 | * |
| Red Hat Discovery 2 | RedHat | discovery/discovery-ui-rhel9:1767904573 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/cds-rhel9:1768221107 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/haproxy-rhel9:1768221100 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/installer-rhel9:1768296285 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/rhua-rhel9:1768377012 | * |
| Python2.7 | Ubuntu | esm-infra/xenial | * |
| Python2.7 | Ubuntu | focal | * |
| Python2.7 | Ubuntu | trusty/esm | * |
| Python3.11 | Ubuntu | mantic | * |
| Python3.12 | Ubuntu | mantic | * |
| Python3.4 | Ubuntu | trusty/esm | * |
| Python3.5 | Ubuntu | esm-infra-legacy/xenial | * |
| Python3.5 | Ubuntu | esm-infra/xenial | * |
| Python3.5 | Ubuntu | trusty/esm | * |
| Python3.8 | Ubuntu | upstream | * |
| Python3.9 | Ubuntu | focal | * |
References
- http://www.openwall.com/lists/oss-security/2024/06/28/4
- https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
- https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31
- https://github.com/python/cpython/issues/121227
- https://github.com/python/cpython/pull/23014
- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
- https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
- https://security.netapp.com/advisory/ntap-20240726-0005/
- http://www.openwall.com/lists/oss-security/2024/06/28/4
- https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
- https://github.com/python/cpython/issues/121227
- https://github.com/python/cpython/pull/23014
- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html
- https://mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
- https://security.netapp.com/advisory/ntap-20240726-0005/