Advisory Details

November 14th, 2017

Foxit Reader FormCalc app Type Confusion Remote Code Execution Vulnerability

ZDI-17-882
ZDI-CAN-5072

CVE ID CVE-2017-16571
CVSS SCORE 6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS Foxit
AFFECTED PRODUCTS Reader
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit 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 references to the app object from FormCalc. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this 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
  • 2017-08-07 - Vulnerability reported to vendor
  • 2017-11-14 - Coordinated public release of advisory
CREDIT Steven Seeley (mr_me) of Offensive Security
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