GLSA 201408-14: stunnel: Information disclosure

http://security.gentoo.org/

Severity:	normal
Title:	stunnel: Information disclosure
Date:	08/29/2014
Bugs:	#503506
ID:	201408-14

Synopsis

A vulnerability in stunnel might allow remote attackers to gain access to private key information.

Background

The stunnel program is designed to work as an SSL encryption wrapper between a client and a local or remote server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/stunnel	< 5.02	>= 5.02	All supported architectures

Description

stunnel does not properly update the state of the pseudo-random generator after fork-threading which causes subsequent children with the same process ID to use the same entropy pool. ECDSA and DSA keys, when not used in deterministic mode (RFC6979), rely on random data for its k parameter to not leak private key information.

Impact

A remote attacker may gain access to private key information from ECDSA or DSA keys.

Workaround

There is no known workaround at this time.

Resolution

All stunnel users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.02"

References

CVE-2014-0016

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201408-14.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.