Bug 1871700 (CVE-2020-15810)

Summary:	CVE-2020-15810 squid: HTTP Request Smuggling 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, a HTTP Request Smuggling 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 19:17:43 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:	1871701, 1872327, 1872328, 1872329, 1872330, 1872331
Bug Blocks:	1871707

Description Michael Kaplan 2020-08-24 04:53:32 UTC

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

Upstream Advisory:

https://github.com/squid-cache/squid/security/advisories/GHSA-3365-q9qx-f98m

Affected Versions: 2.5-3.5.28, 4.0-4.12, 5.0.1-5.0.3
Fixed Versions: 4.13, 5.0.4

Comment 1 Michael Kaplan 2020-08-24 04:55:19 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1871701]

Comment 3 Cedric Buissart 2020-08-26 15:08:59 UTC

Upstream fix:
https://github.com/squid-cache/squid/commit/9c8e2a71aa1d3c159a319d9365c346c48dc783a5

Comment 4 Cedric Buissart 2020-08-27 07:33:40 UTC

Mitigation:

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

```
relaxed_header_parser off
```

Comment 6 errata-xmlrpc 2020-09-03 13:00:55 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 19:17:43 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-2020-15810

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