PT-2021-11436 · Tencent · Tencent Wechat

Wen Guang Jiao · Published 2021-01-22 · Updated 2021-10-18 · CVE-2020-27874

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Tencent WeChat version 7.0.18

Description: This issue allows remote attackers to execute arbitrary code on affected installations. User interaction is required, where the target must visit a malicious page or open a malicious file. The flaw exists within the WXAM Decoder due to the lack of proper validation of user-supplied data, resulting in a memory access past the end of an allocated object. An attacker can leverage this to execute code in the context of the current process.

Recommendations: For Tencent WeChat version 7.0.18, as a temporary workaround, consider disabling the WXAM Decoder until a patch is available. Restrict access to potentially malicious pages or files to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2020-27874

ZDI-21-084

Affected Products

Tencent Wechat

References · 6

• https://zerodayinitiative.com/advisories/ZDI-21-084 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-27874 · Security Note
• https://osv.dev/vulnerability/CVE-2020-27874 · Vendor Advisory
• https://t.me/cvenotify/9992 · Telegram Post
• https://t.me/cvenotify/9768 · Telegram Post
• https://t.me/cibsecurity/23423 · Telegram Post