Bug 1635877 (CVE-2018-17540)

Summary:	CVE-2018-17540 strongswan: heap buffer overflow using crafted certificates
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	avagarwa, code, mikhail.zabaluev, sspreitz
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:	2018-11-12 06:51:43 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:	1635878, 1635879
Bug Blocks:	1635880

Description Laura Pardo 2018-10-03 20:09:24 UTC

A flaw was found in Strongswan caused by the patch that fixes CVE-2018-16151 and CVE-2018-16151 (DSA-4305-1). An attacker could trigger it using crafted certificates with RSA keys with very small moduli. Verifying signatures with such keys would cause an integer underflow and subsequent heap buffer overflow resulting in a crash of the daemon.


References:
https://packetstormsecurity.com/files/149640/dsa-4309-1.txt

Comment 1 Laura Pardo 2018-10-03 20:10:01 UTC

Created strongswan tracking bugs for this issue:

Affects: epel-all [bug 1635878]
Affects: fedora-all [bug 1635879]

Comment 2 Huzaifa S. Sidhpurwala 2018-11-12 06:50:00 UTC

This is a flaw, which is caused by the patch applied to fix CVE-2018-16151 in the gmp plugin. Strongswan in Red Hat Enterprise Linux 7 does not enable the gmp plugin.