Advisory Details

December 7th, 2021

Tencent WeChat WAXM Decoder Use-After-Free Remote Code Execution Vulnerability

ZDI-21-1446
ZDI-CAN-13336

CVE ID
CVSS SCORE 8.8, AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Tencent
AFFECTED PRODUCTS WeChat
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Tencent WeChat. 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 WXAM Decoder. 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.

ADDITIONAL DETAILS

Fixed in version 8.0.10


DISCLOSURE TIMELINE
  • 2021-03-31 - Vulnerability reported to vendor
  • 2021-12-07 - Coordinated public release of advisory
CREDIT Anonymous
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