CVE-2018-18688 Information

Description

The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently an Incremental Saving vulnerability exists in multiple products. When an attacker uses the Incremental Saving feature to add pages or annotations Body Updates are displayed to the user without any action by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects LibreOffice Master PDF Editor Nitro Pro Nitro Reader Nuance Power PDF Standard PDF Editor 6 Pro PDFelement6 Pro PDF Studio Viewer 2018 PDF Studio Pro Perfect PDF 10 Premium and Perfect PDF Reader.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://www.foxitsoftware.com/support/security-bulletins.php https://pdf-insecurity.org/signature/evaluation_2018.html https://pdf-insecurity.org/signature/signature.html https://www.pdfa.org/recently-identified-pdf-digital-signature-vulnerabilities/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3