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PGP Desktop unsigned data injection vulnerability

Vulnerability Note VU#300785

Original Release Date: 2010-11-18 | Last Revised: 2010-11-19

Overview

PGP Desktop 10.0.3 and earlier versions as well as 10.1.0 are vulnerable to an unsigned data injection attack. PGP Command Line versions 9.6 and greater are not affected by this vulnerability.

Description

The PGP Desktop user interface incorrectly displays messages with unsigned data as signed. A user will not be able to distinguish the legitimate signed part from the malicious unsigned parts. Additional details may be found in PGP's KnowledgeBase article 2290, Symantec's Security Advisory SYM10-012, and Eric R. Verheul's Pretty Good Piggy-backing paper.

Impact

An attacker could add a message part (attachment) to a valid, signed PGP message and the entire message, including the attacker's message part, would be reported to the reader as having a valid signature.

Solution

Apply an Update

Users should upgrade to version 10.0.3 SP2 or 10.1.0 SP1.

PGP recommends the following workaround:


If you use PGP Desktop for Windows, do not use the Decrypt & Verify shortcut menu available when you right-click an OpenPGP message file. Instead, launch PGP Desktop, select File->Open, browse to the file name, and open the file. Alternately, double-click the file icon to have it opened in PGP Desktop automatically.

Vendor Information

300785
 
Affected   Unknown   Unaffected

Symantec

Notified:  November 15, 2010 Updated:  November 18, 2010

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

Concerned customers are encouraged to upgrade to version 10.0.3 SP2, which is now available by contacting PGP Technical Support, or 10.1.0 SP1 when it is released.

Vendor References


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

Thanks to Eric R. Verheul for reporting this vulnerability.

This document was written by Jared Allar.

Other Information

CVE IDs: CVE-2010-3618
Severity Metric: 0.41
Date Public: 2010-11-16
Date First Published: 2010-11-18
Date Last Updated: 2010-11-19 16:34 UTC
Document Revision: 25

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