Bug 1658874 (CVE-2018-20102)

Summary:	CVE-2018-20102 haproxy: Out-of-bounds read in dns.c:dns_validate_dns_response() allows for memory disclosure
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, ahardin, bleanhar, bperkins, carl, ccoleman, dbaker, dedgar, eparis, hhorak, jeremy, jgoulding, jokerman, jorton, mchappel, pasik, rohara, sfowler, sthangav, trankin
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	haproxy 1.8.15	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-07-12 13:06:23 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:	1658882, 1659016, 1659017, 1660104, 1660105, 1660106, 1660107
Bug Blocks:	1658879

Description Sam Fowler 2018-12-13 04:58:10 UTC

An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.


Upstream Patch:

http://git.haproxy.org/?p=haproxy.git;a=commit;h=efbbdf72

Comment 1 Sam Fowler 2018-12-13 05:15:13 UTC

Created haproxy tracking bugs for this issue:

Affects: fedora-all [bug 1658882]

Comment 2 Sam Fowler 2018-12-13 05:34:29 UTC

External Reference:

https://www.mail-archive.com/haproxy@formilux.org/msg32055.html

Comment 3 Stefan Cornelius 2018-12-13 11:00:41 UTC

Statement:

This issue did not affect the versions of haproxy as shipped with Red Hat Enterprise Linux 6 and 7.

Comment 6 errata-xmlrpc 2019-06-11 12:01:30 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2019:1436 https://access.redhat.com/errata/RHSA-2019:1436

Comment 7 Product Security DevOps Team 2019-07-12 13:06:23 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-2018-20102