GLSA 201507-15: OpenSSL: Alternate chains certificate forgery

http://security.gentoo.org/

Severity:	normal
Title:	OpenSSL: Alternate chains certificate forgery
Date:	07/10/2015
Bugs:	#554172
ID:	201507-15

Synopsis

Certain checks on untrusted certificates can be bypassed.

Background

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general purpose cryptography library.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/openssl	< 1.0.1p	>= 1.0.1p	All supported architectures

Description

During certificate verification, OpenSSL attempts to find an alternative certificate chain if the first attempt to build such a chain fails.

Impact

A remote attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and “issue” an invalid certificate.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.1p"

References

CVE-2015-1793

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201507-15.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.