GLSA 201408-10: Libgcrypt: Side-channel attack

http://security.gentoo.org/

Severity:	normal
Title:	Libgcrypt: Side-channel attack
Date:	08/29/2014
Bugs:	#519396
ID:	201408-10

Synopsis

A vulnerability in Libgcrypt could allow a remote attacker to extract ElGamal private key information.

Background

Libgcrypt is a general purpose cryptographic library derived out of GnuPG.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/libgcrypt	< 1.5.4	>= 1.5.4	All supported architectures

Description

A vulnerability in the implementation of ElGamal decryption procedures of Libgcrypt leaks information to various side-channels.

Impact

A physical side-channel attack allows a remote attacker to fully extract decryption keys during the decryption of a chosen ciphertext.

Workaround

There is no known workaround at this time.

Resolution

All Libgcrypt users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/libgcrypt-1.5.4"

References

CVE-2014-5270

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201408-10.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.