Bug 1871702 (CVE-2020-15811)

Summary:	CVE-2020-15811 squid: HTTP Request Splitting could result in cache poisoning
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	anon.amish, code, jonathansteffan, luhliari, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 4.13, squid 5.0.4	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in squid. Due to incorrect data validation, an HTTP Request Splitting attack against HTTP and HTTPS traffic is possible leading to cache poisoning. The highest threat from this vulnerability is to data confidentiality and integrity.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-03 19:17:46 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1871704, 1872342, 1872343, 1872344, 1872345, 1872346
Bug Blocks:	1871707

Description Michael Kaplan 2020-08-24 04:59:06 UTC

Due to incorrect data validation Squid is vulnerable to HTTP Request Splitting
attacks against HTTP and HTTPS traffic. This leads to cache poisoning.

Upstream Advisory:

https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wv

Affected Versions: 2.7-3.5.28, 4.0-4.12, 5.0.1-5.0.3 
Fixed Versions: 4.13, 5.0.4

Comment 1 Michael Kaplan 2020-08-24 05:01:17 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1871704]

Comment 3 Cedric Buissart 2020-08-27 07:31:24 UTC

Upstream commit:
https://github.com/squid-cache/squid/commit/fd68382860633aca92065e6c343cfd1b12b126e7

Comment 4 Cedric Buissart 2020-08-27 07:33:25 UTC

Mitigation:

Disable the relaxed HTTP parser in `squid.conf`:

```
relaxed_header_parser off
```

Comment 6 errata-xmlrpc 2020-09-03 13:00:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.1 Extended Update Support
  Red Hat Enterprise Linux 8

Via RHSA-2020:3623 https://access.redhat.com/errata/RHSA-2020:3623

Comment 7 Product Security DevOps Team 2020-09-03 19:17:46 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-2020-15811

Comment 9 errata-xmlrpc 2020-09-30 07:01:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4082 https://access.redhat.com/errata/RHSA-2020:4082