Bug 1770360 (CVE-2019-18679)

Summary:	CVE-2019-18679 squid: Information Disclosure issue in HTTP Digest Authentication
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anon.amish, code, jonathansteffan, luhliari, uwe.knop
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 4.9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-04 02:23:01 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:	1770361, 1771282, 1771283
Bug Blocks:	1770363

Description Pedro Sampaio 2019-11-08 19:52:57 UTC

Due to incorrect data management Squid is vulnerable to a information disclosure when processing HTTP Digest Authentication.

References:

http://www.squid-cache.org/Advisories/SQUID-2019_11.txt

Comment 1 Pedro Sampaio 2019-11-08 19:53:10 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1770361]

Comment 2 Huzaifa S. Sidhpurwala 2019-11-12 05:56:23 UTC

Upstream patch: http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch

Comment 3 Huzaifa S. Sidhpurwala 2019-11-12 05:56:26 UTC

External References:

http://www.squid-cache.org/Advisories/SQUID-2019_11.txt

Comment 4 Huzaifa S. Sidhpurwala 2019-11-12 05:56:30 UTC

Mitigation:

Remove 'auth_param digest ...' configuration settings from squid.conf.

Comment 5 Huzaifa S. Sidhpurwala 2019-11-12 05:58:50 UTC

As per upstream:  Nonce tokens contain the raw byte value of a pointer which sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.

Comment 7 Product Security DevOps Team 2020-11-04 02:23:01 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-2019-18679

Comment 8 errata-xmlrpc 2020-11-04 03:31:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4743 https://access.redhat.com/errata/RHSA-2020:4743