Bug 1968074 (CVE-2021-33503) - CVE-2021-33503 python-urllib3: ReDoS in the parsing of authority part of URL
Summary: CVE-2021-33503 python-urllib3: ReDoS in the parsing of authority part of URL
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-33503
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1973656 1968075 1968076 1968077 1968487 1970176 1970952 1970953 1970954 1970955 1970956 1972639 1973653 1973654 1973655 1973657 1973658 1974305
Blocks: 1968078
TreeView+ depends on / blocked
 
Reported: 2021-06-04 21:09 UTC by Pedro Sampaio
Modified: 2022-04-17 21:26 UTC (History)
70 users (show)

Fixed In Version: urllib3 1.26.5
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in python-urllib3. When provided with a URL containing many @ characters in the authority component, the authority's regular expression exhibits catastrophic backtracking. This flaw causes a denial of service if a URL is passed as a parameter or redirected via an HTTP redirect. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-09-09 00:21:21 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:3254 0 None None None 2021-08-24 08:09:24 UTC
Red Hat Product Errata RHSA-2021:3473 0 None None None 2021-09-08 19:23:27 UTC
Red Hat Product Errata RHSA-2021:4160 0 None None None 2021-11-09 17:27:20 UTC
Red Hat Product Errata RHSA-2021:4162 0 None None None 2021-11-09 17:28:31 UTC
Red Hat Product Errata RHSA-2021:4702 0 None None None 2021-11-16 14:08:21 UTC

Description Pedro Sampaio 2021-06-04 21:09:18 UTC 
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 were passed as a parameter or redirected to via an HTTP redirect.

References:

https://github.com/advisories/GHSA-q2q7-5pp4-w6pg
Comment 1 Pedro Sampaio 2021-06-04 21:12:33 UTC 
Created mingw-python-urllib3 tracking bugs for this issue:

Affects: fedora-34 [bug 1968077]


Created python-urllib3 tracking bugs for this issue:

Affects: fedora-all [bug 1968076]
Affects: openstack-rdo [bug 1968075]
Comment 2 Yadnyawalk Tale 2021-06-07 12:56:52 UTC 
Upstream commit (1.26.x):
https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec
Comment 4 Tapas Jena 2021-06-10 01:38:38 UTC 
Analysis is complete for AAP 1.2 and its found that Ansible Tower (urllib3 v1.24.1) and Pulp Core (urllib3 v1.25.11)are using affected version of urllib3 along with vulnerable functionality. However, directly manipulating auth of url here in Pulp may not be possible. Hence, creating trackers as "affected" -> "delegated".
Comment 17 errata-xmlrpc 2021-08-24 08:09:21 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

Via RHSA-2021:3254 https://access.redhat.com/errata/RHSA-2021:3254
Comment 18 errata-xmlrpc 2021-09-08 19:23:24 UTC 
This issue has been addressed in the following products:

  Red Hat Automation Hub 4.2 for RHEL 7
  Red Hat Automation Hub 4.2 for RHEL 8

Via RHSA-2021:3473 https://access.redhat.com/errata/RHSA-2021:3473
Comment 19 Product Security DevOps Team 2021-09-09 00:21:21 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-33503
Comment 20 errata-xmlrpc 2021-11-09 17:27:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4160 https://access.redhat.com/errata/RHSA-2021:4160
Comment 21 errata-xmlrpc 2021-11-09 17:28:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4162 https://access.redhat.com/errata/RHSA-2021:4162
Comment 22 errata-xmlrpc 2021-11-16 14:08:18 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 6.10 for RHEL 7

Via RHSA-2021:4702 https://access.redhat.com/errata/RHSA-2021:4702
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