13775 : OpenPGP CFB Module Quick Check Feature Information Disclosure
Printer | http://osvdb.org/13775 | Email This | Edit Vulnerability

Views This Week
3

Views All Time
114

Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
Feb 11, 2005

Discovery
Unknown

Dates

Exploit
Unknown

Solution
Unknown

Keywords

 Mister/Zuccherato CFB attack

Description

 OpenPGP protocol contains a flaw that may allow a malicious user to recover part of the plaintext via a chosen-ciphertext attack when the first 2 bytes of a message block are known, and an oracle or other mechanism is available to determine whether an integrity check failed. The issue is triggered when handling a message that was encrypted using cipher feedback (CFB) mode. It is possible that the flaw may result in a loss of confidentiality.

Classification

 Location: Remote/Network Access Required
Attack Type: Cryptographic, Information Disclosure
Impact: Loss of Confidentiality
Exploit: Exploit Unknown
Disclosure: OSVDB Verified

Technical

 You are effected only if you have your OpenPGP program set up as part of an automated system to accept encrypted messages, decrypt them, and then provide a response to the submitter.

Solution

 Upgrade to GNU Privacy Guard version 1.4.1 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
Other vendors of OpenPGP-based products (PGP Corporation, and Hush Communications) plan to disable the quick check feature for all public key-encrypted messages and files until the vulnerability can be fully addressed by modifying the OpenPGP standard.

Products
Free Software Foundation
Watch-list
GNU Privacy Guard
Watch-list
 1.4.1
1.4.0
1.2.7
1.2.6
1.2.5

References

Tools & Filters

Nessus

 17334 17616 19349 20577

Credit
  • Serge Mister - serge.misterBrand New Doo Dooentrust.com - Entrust, Inc.
  • Robert Zuccherato - robert.zuccheratoBrand New Doo Dooentrust.com - Entrust, Inc.

Blogs

Provided by Technorati

 None found at this time

Comments

Add Comment

No Comments.

DONATE NOW!

User Status

Quick Searches

Advertisements

The database information may change without any notice. Use of the information constitutes acceptance for use in an AS IS condition, and there are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the copyright holder or distributor (OSVDB or OSF) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

© Copyright 2008 Open Source Vulnerability Database (OSVDB), All Rights Reserved.
Privacy Statement - Terms of Use