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Vigil@nce - GnuPG: infinite loop of Truncated zlib

July 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can send an encrypted message with truncated compressed data, to generate an infinite loop in GnuPG, in order to trigger a denial of service.

Impacted products: Debian, Fedora, GnuPG, openSUSE, Slackware, Ubuntu

Severity: 2/4

Creation date: 24/06/2014

DESCRIPTION OF THE VULNERABILITY

The OpenPGP format compresses (zlib algorithm) the message before encrypting it.

The GnuPG product uncompresses the decrypted message. However, if compressed data are too short, the do_uncompress() function of the g10/compress.c file continues indefinitely to wait for these data.

An attacker can therefore send an encrypted message with truncated compressed data, to generate an infinite loop in GnuPG, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/G...




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