Bug 1319052 – CVE-2016-3099 mod_nss: Invalid handling of +CIPHER operator

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Bug 1319052 - (CVE-2016-3099) CVE-2016-3099 mod_nss: Invalid handling of +CIPHER operator

Summary:	CVE-2016-3099 mod_nss: Invalid handling of +CIPHER operator

Status:	NEW

Aliases:	CVE-2016-3099

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20160405,reported=2...
Keywords:	Security

Depends On:	1323913 1323914
Blocks:	1319056 1323912
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Reported:	2016-03-18 10:30 EDT by Adam Mariš
Modified:	2016-11-04 03:59 EDT (History)
CC List:	9 users (show)

See Also:
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:	---
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Last Closed:
Type:	---
Regression:	---
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CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2602	normal	SHIPPED_LIVE	Low: mod_nss security, bug fix, and enhancement update	2016-11-03 08:12:49 EDT

Groups: None (edit)

Description Adam Mariš 2016-03-18 10:30:28 EDT

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 10:30:35 EDT

Acknowledgments:

Name: Rob Crittenden (Red Hat)

Comment 4 Huzaifa S. Sidhpurwala 2016-04-05 00:49:23 EDT

Created mod_nss tracking bugs for this issue:

Affects: fedora-all [bug 1323914]

Comment 5 errata-xmlrpc 2016-11-03 17:20:27 EDT

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

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