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EGI SVG ADVISORY [EGI-SVG-NSS-CVE-2015-7183]
Title: EGI SVG Advisory - 'Critical' risk. Remote arbitrary code execution
vulnerabilities in the core crypto library used by RedHat.
Date: 2015-11-06
Updated:
URL: https://advisories.egi.eu/2015/Advisory-SVG-2015-CVE-2015-7183
Introduction
============
RedHat has released fixes to their core crypto library which they describe as
'critical' [R 1]
The vulnerabilities are CVE-2015-7181, CVE-2015-7182, CVE-2015-7183 and are in
the US National Vulnerability Database (NVD) [R 2] [R 3] and [R 4]
All three may allow remote code execution, which may be as root, for an
unauthenticated attacker.
Despite the fact that full details are not available, and we have not
demonstrated that it is possible to carry out an attack on the EGI
infrastructure, we are asking sites to update urgently.
Details
=======
See [R 1] [R 5] [R 6],
NVD entries are at [R 2], [R 3] and [R 4]
Note that RedHat is using NSS (which originally is the Netscape Secure Sockets
implementation, nowadays used by Firefox and others) as the generic crypt
library for RedHat, used for e.g. TLS (and its predecessor SSL) and other
certificate handling instead of OpenSSL or GnuTLS.
Risk category
=============
This issue has been assessed as 'Critical' risk by the EGI SVG Risk Assessment
Team.
Affected software
=================
All software where the SSL handshaking is based on Mozilla Network security
services which includes RedHat and it's derivatives.
This includes Redhat Linux versions 6 and 7 and their derivatives.
GnuTLS and OpenSSL are not affected.
Mitigation
==========
N/A
Component installation information
==================================
See RH and derivatives own documentations.
For scientific linux see [R 7]
Some services may need to be re-started.
Where possible it is suggested that sites re-boot after installing the updates.
If this is not possible, Site admins MUST check for ALL services that are still
using the libnss libraries, e.g. using
yum ps
(when available via yum-plugin-ps)
or
needs-restarting
(when available via yum-utils)
or this oneliner:
grep -l 'libnss.*deleted' /proc/*/maps | tr -cd 0-9\\n | xargs -r ps u
Recommendations
===============
All running resources based on Red hat and it's derivatives MUST be patched by
2015-11-13 T21:00+01:00.
Sites failing to act and/or failing to respond to requests from the EGI CSIRT
team risk site suspension.
Credit
======
SVG was alerted to this vulnerability by Frederic Schaer.
References
==========
[R 1] https://rhn.redhat.com/errata/RHSA-2015-1981.html
[R 2] https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7181
[R 3] https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7182
[R 4] https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7183
[R 5] https://www.mozilla.org/en-US/security/advisories/mfsa2015-133/
[R 6] https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19.2.1_release_notes#Security_Advisories
[R 7] https://www.scientificlinux.org/sl-errata/slsa-20151981-1/
Comments
========
Comments or questions should be sent to svg-rat at mailman.egi.eu
We are currently revising the vulnerability issue handling procedure so
suggestions and comments are welcome.
Timeline
========
Yyyy-mm-dd
2015-11-04 Redhat released patches for these vulnerabilities
2015-11-04 Frederic Schaer alerted EGI to this announcement
2015-11-05 Acknowledgement from the EGI SVG to the reporter
2015-11-05 Risk Assessment by the EGI Software Vulnerability Group
2015-11-06 Advisory sent to sites.
On behalf of the EGI SVG,