GLSA 201408-10: Libgcrypt: Side-channel attack

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

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.

License

Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!