Bug 1418611 (CVE-2016-10196)

Summary:	CVE-2016-10196 libevent: Stack-buffer overflow in evutil_parse_sockaddr_port()
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	cschalle, gecko-bugs-nobody, jfeeney, jhorak, rdma-dev-team, steved, stransky, tpopela
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in libevent with the parsing of IPv6 addresses. If an attacker could cause an application using libevent to parse a malformed address in IPv6 notation of more than 2GiB in length, a stack overflow would occur leading to a crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-03-24 04:59:34 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:	1418616
Bug Blocks:	1418615

Description Andrej Nemec 2017-02-02 10:33:59 UTC

A vulnerability was found in libevent. There is a stack-buffer overflow in evutil.c.

Upstream bug:

https://github.com/libevent/libevent/issues/318

Upstream patch:

https://github.com/libevent/libevent/commit/329acc18a0768c21ba22522f01a5c7f46cacc4d5

Comment 1 Andrej Nemec 2017-02-02 10:41:23 UTC

Created libevent tracking bugs for this issue:

Affects: fedora-all [bug 1418616]

Comment 3 Doran Moppert 2017-02-10 05:48:09 UTC

nfs-utils since rhel-5 does not use embedded libevent

Comment 4 Doran Moppert 2017-02-21 03:01:24 UTC

libevent.1.4 does not include support for IPv6.

openmpi does not use or expose any functions in libevent which expose this vulnerability.

Stack canaries prevent exploitation of this flaw for arbitrary code execution, limiting the potential impact to only a crash.

Comment 5 errata-xmlrpc 2017-05-08 06:46:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2017:1201 https://access.redhat.com/errata/RHSA-2017:1201