Bug 1015946 (CVE-2013-5915)

Summary:	CVE-2013-5915 polarssl: Information disclosure of RSA private keys
Product:	[Other] Security Response	Reporter:	Ratul Gupta <ratulg>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mads
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	polarssl 1.2.9, polarssl 1.3.0	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:30:36 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:	1015947
Bug Blocks:

Description Ratul Gupta 2013-10-07 05:41:54 UTC

PolarSSL's RSA implementation was found to have a bias in the implementation of Montgomery multiplication. It can be used to mount an attack on RSA key.

Here, a third party can send arbitrary handshake messages to the server. If correctly executed, this attack could reveal the entire private RSA key after a large number of attack messages are sent to show the timing differences.

There is a known workaround to Disable CRT (#define POLARSSL_RSA_NO_CRT) in config.h. The code will be much slower, but unaffected by this attack, but best is to upgrade to either 1.2.9 or 1.3.0.

References:
https://bugs.gentoo.org/show_bug.cgi?id=487170
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-5915
https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-05

Comment 1 Ratul Gupta 2013-10-07 05:42:38 UTC

Created polarssl tracking bugs for this issue:

Affects: fedora-all [bug 1015947]

Comment 2 Tomas Hoger 2013-10-08 07:05:02 UTC

Upstream fix:
https://github.com/polarssl/polarssl/commit/43f9799ce61c6392a014d0a2ea136b4b3a9ee194

Further improved in 1.2.10 to make it thread-safe:
https://github.com/polarssl/polarssl/commit/6b06502c4b19ce40a88faca3528b9f3f0c87a755

Comment 3 Mads Kiilerich 2013-10-09 00:36:03 UTC

All fedora versions already had 1.2.9 in testing when this was filed. It would be nice if your automatic tools were a bit smarter.

Comment 5 Fedora Update System 2014-06-19 22:55:02 UTC

polarssl-1.2.10-2.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-06-19 22:57:40 UTC

polarssl-1.2.10-2.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Product Security DevOps Team 2019-06-08 02:30:36 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.