Bug 1959537 (CVE-2021-33620) - CVE-2021-33620 squid: denial of service in HTTP response processing
Summary: CVE-2021-33620 squid: denial of service in HTTP response processing
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-33620
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: 1959538 Red Hat1960215 Red Hat1960216
Blocks: Embargoed1959539
TreeView+ depends on / blocked
 
Reported: 2021-05-11 18:04 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-04-17 21:23 UTC (History)
6 users (show)

Fixed In Version: squid 4.15, squid 5.0.6
Doc Type: If docs needed, set a value
Doc Text:
An input validation flaw was found in Squid. This issue could allow a remote server to perform a denial of service against all clients using the proxy when delivering HTTP response messages. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-11-09 18:54:44 UTC

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:4292 0 None None None 2021-11-09 18:05:42 UTC

Description Guilherme de Almeida Suckevicz 2021-05-11 18:04:54 UTC 
Due to an input validation bug Squid is vulnerable to a Denial of Service against all clients using the proxy. This problem allows a remote server to perform Denial of Service when delivering HTTP Response messages. The issue trigger is a header which can be expected to exist in HTTP traffic without any malicious intent by the server.

Reference:
https://github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7f/
Comment 1 Guilherme de Almeida Suckevicz 2021-05-11 18:05:11 UTC 
Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1959538]
Comment 3 Mauro Matteo Cascella 2021-05-13 10:23:16 UTC 
Upstream pull request:
https://github.com/squid-cache/squid/pull/791

Upstream commits:
https://github.com/squid-cache/squid/commit/6c9c44d0e9cf7b72bb233360c5308aa063af3d69 [master]
https://github.com/squid-cache/squid/commit/8af775ed98bfd610f9ce762fe177e01b2675588c [v5]
https://github.com/squid-cache/squid/commit/1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c [v4]
Comment 10 errata-xmlrpc 2021-11-09 18:05:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4292 https://access.redhat.com/errata/RHSA-2021:4292
Comment 11 Product Security DevOps Team 2021-11-09 18:54:41 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-2021-33620
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