Bug 1509291 (CVE-2017-16227)

Summary:	CVE-2017-16227 quagga: Incorrect AS_PATH size calculation for long paths
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	balajig81, bennie.joubert, jaskalnik, mruprich, msekleta
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	quagga 1.2.2	Doc Type:	If docs needed, set a value
Doc Text:	A denial of service flaw was found in the way the bgpd daemon in Quagga handled the processing of large BGP update messages. A remote, previously trusted attacker could potentially use this flaw to cause bgpd to terminate existing BGP sessions, thereby leading to denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-11-14 08:20:24 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:	1509292
Bug Blocks:	1509296

Description Adam Mariš 2017-11-03 13:39:06 UTC

The aspath_put function in bgpd/bgp_aspath.c in Quagga before 1.2.2 allows remote attackers to cause a denial of service (session drop) via BGP UPDATE messages, because AS_PATH size calculation for long paths counts certain bytes twice and consequently constructs an invalid message.

Affected versions: 0.99.10 - 0.99.24.1, 1.0.*, 1.1.0, 1.1.1, 1.2.0, 1.2.1

Upstream patch:

https://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7a42b78be9a4108d98833069a88e6fddb9285008

Reference:

https://lists.quagga.net/pipermail/quagga-dev/2017-September/033284.html

Comment 1 Adam Mariš 2017-11-03 13:39:37 UTC

Created quagga tracking bugs for this issue:

Affects: fedora-all [bug 1509292]