Resource Exhaustion Affecting python3-libs package, versions <0:3.6.8-39.el8_4
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Test your applications- Snyk ID SNYK-RHEL8-PYTHON3LIBS-1577475
- published 1 Sep 2021
- disclosed 10 Aug 2021
Introduced: 10 Aug 2021
CVE-2021-3733 Open this link in a new tabHow to fix?
Upgrade RHEL:8 python3-libs to version 0:3.6.8-39.el8_4 or higher.
This issue was patched in RHSA-2021:4057.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python3-libs package and not the python3-libs package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
References
- https://access.redhat.com/security/cve/CVE-2021-3733
- https://access.redhat.com/errata/RHSA-2021:4057
- https://bugs.python.org/issue43075
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
- https://github.com/python/cpython/pull/24391
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://security.netapp.com/advisory/ntap-20220407-0001/
- https://ubuntu.com/security/CVE-2021-3733