Bug 1386109 (CVE-2016-1245)

Summary:	CVE-2016-1245 quagga: Buffer Overflow in IPv6 RA handling
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	balajig81, fweimer, mruprich, msekleta, vincent.jardin
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Quagga 1.0.20161017	Doc Type:	If docs needed, set a value
Doc Text:	A stack-based buffer overflow flaw was found in the way Quagga handled IPv6 router advertisement messages. A remote attacker could use this flaw to crash the zebra daemon resulting in denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:00:20 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:	1386110, 1391914
Bug Blocks:	1386080, 1386111

Description Andrej Nemec 2016-10-18 07:58:56 UTC

A buffer overflow exists in the IPv6 (Router Advertisement) code in Zebra. The issue can be triggered on an IPv6 address where the Quagga daemon is reachable by a RA (Router Advertisement or IPv6 ICMP message. The issue leads to a crash of the zebra daemon. In specific circumstances this vulnerability may allow remote code execution.

Upstream patch:

https://github.com/Quagga/quagga/commit/cfb1fae25f8c092e0d17073eaf7bd428ce1cd546

References:

http://www.gossamer-threads.com/lists/quagga/users/31952

Workarounds:

Disable IPv6 neighbor discovery announcements on all interfaces ("ipv6 nd suppress-ra" configured under all interfaces).  Make sure to have it disabled on ALL interfaces.

Comment 1 Andrej Nemec 2016-10-18 07:59:19 UTC

Created quagga tracking bugs for this issue:

Affects: fedora-all [bug 1386110]

Comment 7 Dhiru Kholia 2016-10-21 08:18:19 UTC

On RHEL (and Fedora), the usage of -fstack-protector compilation flag limits the impact of this stack-based buffer overflow to a crash (denial-of-service) in the zebra daemon. Our CVSS scores reflect this fact.

Comment 11 errata-xmlrpc 2017-03-21 11:56:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0794 https://rhn.redhat.com/errata/RHSA-2017-0794.html