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Category:   Application (Security)  >   OpenPGP Vendors:
OpenPGP CFB Mode Is Subject to Adaptive Chosen-Plaintext Attacks
SecurityTracker Alert ID:  1013166
SecurityTracker URL:
CVE Reference:   CVE-2005-0366   (Links to External Site)
Updated:  Mar 16 2005
Original Entry Date:  Feb 11 2005
Impact:   Disclosure of system information, Disclosure of user information
Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in OpenPGP. A remote user can conduct an adaptive-chosen-ciphertext attack against OpenPGP's cipher feedback mode.

A particular variation of cipher feedback (CFB) used by OpenPGP is affected. The flaw is due to an ad-hoc integrity check feature in OpenPGP. The 'quick check' feature when OpenPGP encrypts bulk data may leak some data that can be used in the attack.

The original report is available at:

Serge Mister and Robert Zuccherato of Entrust reported this vulnerability.

Impact:   A remote user may be able to determine a small amount of plaintext.
Solution:   Vendor's of OpenPGP-based products (PGP Corporation, GnuPG, and Hush Communications) plan to disable the quick check feature for all public key-encrypted messages and files. This will be available in the next release of the product.
Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 16 2005 (Mandrake Issues Fix for GnuPG) OpenPGP CFB Mode Is Subject to Adaptive Chosen-Plaintext Attacks
Mandrake has released a fix for GnuPG.

 Source Message Contents

[Original Message Not Available for Viewing]

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