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[ GLSA 200503-29 ] GnuPG: OpenPGP protocol attack
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GLSA
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Joined: 13 Jun 2003
Posts: 4079
Location: Dresden, Germany

PostPosted: Thu Mar 24, 2005 10:06 pm    Post subject: [ GLSA 200503-29 ] GnuPG: OpenPGP protocol attack Reply with quote

Gentoo Linux Security Advisory

Title: GnuPG: OpenPGP protocol attack (GLSA 200503-29)
Severity: low
Exploitable: remote
Date: March 24, 2005
Bug(s): #85547
ID: 200503-29

Synopsis

Automated systems using GnuPG may leak plaintext portions of an encrypted message.

Background

GnuPG is complete and free replacement for PGP, a tool for secure communication and data storage.

Affected Packages

Package: app-crypt/gnupg
Vulnerable: < 1.4.1
Unaffected: >= 1.4.1
Architectures: All supported architectures


Description

A flaw has been identified in an integrity checking mechanism of the OpenPGP protocol.

Impact

An automated system using GnuPG that allows an attacker to repeatedly discover the outcome of an integrity check (perhaps by observing the time required to return a response, or via overly verbose error messages) could theoretically reveal a small portion of plaintext.

Workaround

There is no known workaround at this time.

Resolution

All GnuPG users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.1"


References

CERT VU#303094
CAN-2005-0366


Last edited by GLSA on Sun May 07, 2006 4:55 pm; edited 1 time in total
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