Bug 1730533 (CVE-2019-12527)

Summary:	CVE-2019-12527 squid: heap-based buffer overflow in HttpHeader::getAuth
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, kyoshida, luhliari, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 4.8	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was discovered in Squid versions 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data but does not check that the decoded length is not greater than the buffer. This flaw leads to a heap-based buffer overflow with user-controlled data.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-09-03 07:07:19 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:	1730534, 1738485, 1744672
Bug Blocks:	1730537

Description Dhananjay Arunesh 2019-07-17 04:22:04 UTC

An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic
Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the
decoded data. Squid does not check that the decoded length isn't greater than
the buffer, leading to a heap-based buffer overflow with user controlled data.

Reference:
https://github.com/squid-cache/squid/commits/v4
http://www.squid-cache.org/Versions/v4/changesets/

Upstream Patch:
http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch

Comment 1 Dhananjay Arunesh 2019-07-17 04:22:21 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1730534]

Comment 2 Dhananjay Arunesh 2019-07-17 04:23:02 UTC

External References:

http://www.squid-cache.org/Advisories/SQUID-2019_5.txt

Comment 4 Cedric Buissart 2019-08-07 14:09:25 UTC

Mitigation:

Deny ftp:// protocol URLs being proxied and Cache Manager report access to all clients:

    acl FTP proto FTP
    http_access deny FTP
    http_access deny manager

Comment 8 errata-xmlrpc 2019-09-02 10:34:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:2593 https://access.redhat.com/errata/RHSA-2019:2593

Comment 9 Product Security DevOps Team 2019-09-03 07:07:19 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-2019-12527