Bug 1319052 (CVE-2016-3099)

Summary:	CVE-2016-3099 mod_nss: Invalid handling of +CIPHER operator
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	alee, cfu, dpal, huzaifas, jmagne, mharmsen, nkinder, rcritten, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way mod_nss parsed certain OpenSSL-style cipher strings. As a result, mod_nss could potentially use ciphers that were not intended to be enabled.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:49:52 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:	1323913, 1323914
Bug Blocks:	1319056, 1323912

Description Adam Mariš 2016-03-18 14:30:28 UTC

It was reported that +CIPHER operator in OpenSSL changes the order of a cipher. Since cipher ordering isn't supported in NSS, the mod_nss code was supposed to return an error. Instead it returned the result of processing up to that point. Default OpenSSL cipher string:

!SSLv2:kEECDH:kRSA:kEDH:kPSK:+3DES:!aNULL:!eNULL:!MD5:!EXP:!RC4:!SEED:!IDEA:!DES

Would not properly exclude anything because only the first 5 elements would be examined.

Comment 1 Adam Mariš 2016-03-18 14:30:35 UTC

Acknowledgments:

Name: Rob Crittenden (Red Hat)

Comment 4 Huzaifa S. Sidhpurwala 2016-04-05 04:49:23 UTC

Created mod_nss tracking bugs for this issue:

Affects: fedora-all [bug 1323914]

Comment 5 errata-xmlrpc 2016-11-03 21:20:27 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2602 https://rhn.redhat.com/errata/RHSA-2016-2602.html