Advisory Details

February 11th, 2020

Foxit PhantomPDF AcroForm addWatermarkFromText Use-After-Free Remote Code Execution Vulnerability

ZDI-20-201
ZDI-CAN-9358

CVE ID CVE-2020-8845
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Foxit
AFFECTED PRODUCTS PhantomPDF
VULNERABILITY DETAILS

This vulnerability allows remote atackers to execute arbitrary code on affected installations of Foxit PhantomPDF. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of watermarks in AcroForms. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Foxit has issued an update to correct this vulnerability. More details can be found at:
https://www.foxitsoftware.com/support/security-bulletins.php
DISCLOSURE TIMELINE
  • 2019-09-17 - Vulnerability reported to vendor
  • 2020-02-11 - Coordinated public release of advisory
CREDIT Mat Powell of Trend Micro Zero Day Initiative
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