Portable Document Format Specification Signature Collision Vulnerability

Bugtraq ID:	42377
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Aug 11 2010 12:00AM
Updated:	Aug 11 2010 12:00AM
Credit:	Florian Zumbiehl
Vulnerable:	Adobe Reader 9.3.3 Adobe Reader 9.3.2 Adobe Reader 9.3.1 Adobe Reader 9.1.3 Adobe Reader 9.1.2 Adobe Reader 9.1.1 Adobe Reader 8.2.3 Adobe Reader 8.2.2 Adobe Reader 8.2.1 Adobe Reader 8.1.7 Adobe Reader 8.1.6 Adobe Reader 8.1.5 Adobe Reader 8.1.4 Adobe Reader 8.1.3 Adobe Reader 8.1.2 Adobe Reader 8.1.1 Adobe Reader 7.1.4 Adobe Reader 7.1.3 Adobe Reader 7.1.2 Adobe Reader 7.1.1 Adobe Reader 7.0.9 Adobe Reader 7.0.8 Adobe Reader 7.0.7 Adobe Reader 7.0.6 Adobe Reader 7.0.5 Adobe Reader 7.0.4 Adobe Reader 7.0.3 Adobe Reader 7.0.2 Adobe Reader 7.0.1 Adobe Reader 7.0 Adobe Reader 6.0.5 Adobe Reader 6.0.4 Adobe Reader 6.0.3 Adobe Reader 6.0.2 Adobe Reader 6.0.1 Adobe Reader 6.0 Adobe Reader 9.3 Adobe Reader 9.2 Adobe Reader 9.1 Adobe Reader 9.0 Adobe Reader 8.2 Adobe Reader 8.1.2 Security Updat Adobe Reader 8.1 Adobe Reader 8.0 Adobe Reader 7.1 Adobe Acrobat Professional 9.3.3 Adobe Acrobat Professional 9.3.2 Adobe Acrobat Professional 9.3.1 Adobe Acrobat Professional 9.1.3 Adobe Acrobat Professional 9.1.2 Adobe Acrobat Professional 8.2.2 Adobe Acrobat Professional 8.2.1 Adobe Acrobat Professional 8.1.7 Adobe Acrobat Professional 8.1.6 Adobe Acrobat Professional 8.1.4 Adobe Acrobat Professional 8.1.3 Adobe Acrobat Professional 8.1.2 Adobe Acrobat Professional 8.1.1 Adobe Acrobat Professional 7.1.4 Adobe Acrobat Professional 7.1.3 Adobe Acrobat Professional 7.1.1 Adobe Acrobat Professional 7.0.9 Adobe Acrobat Professional 7.0.8 Adobe Acrobat Professional 7.0.7 Adobe Acrobat Professional 7.0.6 Adobe Acrobat Professional 7.0.5 Adobe Acrobat Professional 7.0.4 Adobe Acrobat Professional 7.0.3 Adobe Acrobat Professional 7.0.2 Adobe Acrobat Professional 7.0.1 Adobe Acrobat Professional 7.0 Adobe Acrobat Professional 9.3 Adobe Acrobat Professional 9.2 Adobe Acrobat Professional 9.1 Adobe Acrobat Professional 9 Adobe Acrobat Professional 8.2 Adobe Acrobat Professional 8.1.2 Security Updat Adobe Acrobat Professional 8.1 Adobe Acrobat Professional 8.0 Adobe Acrobat Professional 7.1 Adobe Acrobat Professional 6.0
Not Vulnerable:

Portable Document Format Specification Signature Collision Vulnerability

The Portable Document Format (PDF) specification is prone to a signature-collision attack when signing PDF documents.

An attacker can exploit this issue to create PDF documents containing forged signatures. Successfully exploiting this issue will result in the application accepting the signature of a document as valid when it is not. This may result in a false sense of security; other attacks are also possible.

All products conforming to the specification for signing PDF documents are affected by this issue.

Portable Document Format Specification Signature Collision Vulnerability

The following exploit is available:

• /data/vulnerabilities/exploits/pdfsig-collision.tar.gz

Portable Document Format Specification Signature Collision Vulnerability

Solution:
Currently we are not aware of vendor supplied patches. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Portable Document Format Specification Signature Collision Vulnerability

References:

• Adobe Homepage (Adobe)
  
• Collisions in PDF signatures (Florian Zumbiehl )