Advisory Details

October 15th, 2021

Foxit PDF Reader Annotation Out-Of-Bounds Read Remote Code Execution Vulnerability

ZDI-21-1181
ZDI-CAN-14396

CVE ID CVE-2021-34950
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 PDF Reader
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader. 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 Annotation objects. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated 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.foxit.com/support/security-bulletins.html
DISCLOSURE TIMELINE
  • 2021-07-23 - Vulnerability reported to vendor
  • 2021-10-15 - Coordinated public release of advisory
CREDIT ZhangJiaxing(@r0fm1a) from Codesafe Team of Legendsec at Qi'anxin Group
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