Advisory Details

May 7th, 2021

Foxit Reader XFA leadDigits Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-31454
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	Reader
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected 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 the Decimal element. A crafted leadDigits value in a Decimal element can trigger an overflow of a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute arbitrary 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	2021-03-03 - Vulnerability reported to vendor 2021-05-07 - Coordinated public release of advisory 2021-05-07 - Advisory Updated
CREDIT	Yongil Lee(@intellee) and Wonyoung Jung(@nonetype) of Diffense

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