Bug 928011 (CVE-2013-2494)

Summary:	CVE-2013-2494 dhcp: bind/libdns CVE-2013-2266 regular expressions excessive resource consumption DoS
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	atkac, jpopelka, thozza
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-03-27 10:36:35 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:
Bug Blocks:	928048

Description Jan Lieskovsky 2013-03-26 17:03:56 UTC

A denial of service flaw was found in the way libdns library implementation of BIND processed certain requests. A DHCP client could issue a specially-crafted DHCP protocol request that, when processed would lead to excessive memory consumption (memory exhaustion) at the side of the DHCP server process, possibly leading to its crash.

References:
[1] https://kb.isc.org/article/AA-00880
[2] ftp://ftp.isc.org/isc/dhcp/4.2.5-P1/dhcp-4.2.5-P1-RELNOTES

Comment 6 Tomas Hoger 2013-03-26 19:31:53 UTC

Release notes indicate:

- A security issue in Bind9 was found and fixed.  This release includes the
  fixed Bind9 code.  There have been no code changes to the DHCP code.
  [ISC-Bugs #32688]
  CVE: CVE-2013-2266

DHCP update upgrades used Bind version to fix CVE-2013-2266 (bug 928027).  There should be no separate CVE id assigned for DHCP just because it's different application that uses/embeds vulnerable Bind code.

Comment 7 Tomas Hoger 2013-03-26 19:46:40 UTC

Fedora dhcp builds remove embed bind source and link against system libdns:

http://pkgs.fedoraproject.org/cgit/dhcp.git/tree/dhcp.spec?id=4a364d130b918caed6d357fd5a1fcc2c35926851#n176

Comment 12 Huzaifa S. Sidhpurwala 2013-03-27 10:36:13 UTC

Statement:

Not Vulnerable. This issue does not affect the version of dhcp as shipped with Red Hat Enterprise Linux 5 and 6.

Comment 13 Huzaifa S. Sidhpurwala 2013-03-27 10:36:35 UTC


*** This bug has been marked as a duplicate of bug 928027 ***

Comment 14 Huzaifa S. Sidhpurwala 2013-03-27 10:37:36 UTC

This issue does not affect the version of dhcp as shipped with Fedora 17 and Fedora 18. More details in comment #7