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Alerts This Week
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Gentoo Libgcrypt GLSA-201408-10 Normal: ElGamal Key Extraction Risk

gentoo
Calendar Grey August 29, 2014
Scroller Gentoo
A vulnerability in Libgcrypt allows side-channel attacks to unveil ElGamal keys. It is critical to update to version 1.5.4 or later without delay to ensure system security.
A vulnerability in Libgcrypt could allow a remote attacker to extract ElGamal private key information.

Summary

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

Topics%20covered

Topics Covered

security advisory gentoo normal side-channel key extraction libgcrypt elgamal

Resolution

All Libgcrypt users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-libs/libgcrypt-1.5.4"

References

[ 1 ] CVE-2014-5270 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5270

Availability

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

Severity: Normal
Title: Libgcrypt: Side-channel attack
Date: August 29, 2014
Bugs: #519396
ID: 201408-10

Topics%20covered

Topics Covered

security advisory gentoo normal side-channel key extraction libgcrypt elgamal

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-libs/libgcrypt < 1.5.4 >= 1.5.4

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.