Advisory Details

April 20th, 2018

Foxit Reader XFA Button resetData Use-After-Free Remote Code Execution Vulnerability

ZDI-18-341
ZDI-CAN-5618

CVE ID CVE-2018-9957
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 XFA Button elements. When parsing arguments passed to the resetData method, the process does not properly validate the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code under the context of the current process.

VENDOR RESPONSE 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
  • 2018-01-30 - Vulnerability reported to vendor
  • 2018-04-20 - Coordinated public release of advisory
  • 2018-04-20 - Advisory Updated
CREDIT Steven Seeley (mr_me) of Source Incite
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