ASA-202106-25 log generated external raw
[ASA-202106-25] python-urllib3: denial of service |
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Arch Linux Security Advisory ASA-202106-25
==========================================
Severity: Medium
Date : 2021-06-09
CVE-ID : CVE-2021-33503
Package : python-urllib3
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-2038
Summary
=======
The package python-urllib3 before version 1.26.5-1 is vulnerable to
denial of service.
Resolution
==========
Upgrade to 1.26.5-1.
# pacman -Syu "python-urllib3>=1.26.5-1"
The problem has been fixed upstream in version 1.26.5.
Workaround
==========
None.
Description
===========
A security issue has been found in python-urllib3 before version
1.26.5. When provided with a URL containing many @ characters in the
authority component, the authority regular expression exhibits
catastrophic backtracking, causing a denial of service if a URL was
passed as a parameter or redirected to via an HTTP redirect.
Impact
======
A remote attacker could exhaust CPU resources, leading to denial of
service, using a crafted URL.
References
==========
https://github.com/urllib3/urllib3/security/advisories/GHSA-q2q7-5pp4-w6pg
https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec
https://security.archlinux.org/CVE-2021-33503
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