Bug 1470232 (CVE-2016-10396)

Summary:	CVE-2016-10396 ipsec-tools: Parsing and storing ISAKMP fragments in malicious order can exhaust resources
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:	bloch, pwouters, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-07-12 14:43:15 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:	1470233, 1470234
Bug Blocks:

Description Andrej Nemec 2017-07-12 14:39:29 UTC

The racoon daemon in IPsec-Tools 0.8.2 contains a remotely exploitable
computational-complexity attack when parsing and storing ISAKMP
fragments. The implementation permits a remote attacker to exhaust
computational resources on the remote endpoint by repeatedly sending
ISAKMP fragment packets in a particular order such that the worst-case
computational complexity is realized in the algorithm utilized to
determine if reassembly of the fragments can take place.

References:

https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=51682

Upstream patch:

http://cvsweb.netbsd.org/bsdweb.cgi/src/crypto/dist/ipsec-tools/src/racoon/isakmp_frag.c.diff?r1=1.5&r2=1.5.36.1

Comment 1 Andrej Nemec 2017-07-12 14:39:51 UTC

Created ipsec-tools tracking bugs for this issue:

Affects: epel-all [bug 1470233]
Affects: fedora-all [bug 1470234]