2021-34838 | Foxit PDF Reader Annotation Object use after free

By Max On Aug 8, 2021

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6.7	$0-$5k	0.19

A vulnerability was found in Foxit PDF Reader 11.0.0.49893 (Document Reader Software). It has been classified as critical. Affected is an unknown function of the component Annotation Object Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-416. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 11.0.0.49893. 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 validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-14019.

The weakness was released 08/05/2021. The advisory is shared for download at zerodayinitiative.com. This vulnerability is traded as CVE-2021-34838 since 06/17/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn’t require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading eliminates this vulnerability.

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