2021-38563 | Foxit PDF Reader/PDF Editor out-of-bounds write

By Max On Aug 16, 2021

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6.0	$0-$5k	0.18

A vulnerability was found in Foxit PDF Reader and PDF Editor up to 11.0.0 (Document Reader Software) and classified as critical. This issue affects an unknown code. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-787. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size (derived from a /Size entry) is smaller than the maximum indirect object number, and thus there is an attempted incorrect array access (leading to a NULL pointer dereference, or out-of-bounds read or write).

The weakness was presented 08/12/2021. The advisory is shared at foxitsoftware.com. The identification of this vulnerability is CVE-2021-38563 since 08/11/2021. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 11.0.1 eliminates this vulnerability.

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