PT-2021-20347 · Tencent · Tencent Gameloop

Mmiszczyk · Published 2021-06-06 · Updated 2021-06-15 · CVE-2021-33879

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Tencent GameLoop versions prior to 4.1.21.90

Description: The issue allows a malicious attacker in a man-in-the-middle (MITM) position to spoof the contents of an XML document describing an update package. This can replace a download URL with one pointing to an arbitrary Windows executable. Since the only integrity check is a comparison of the downloaded file's MD5 checksum to the one contained within the XML document, the downloaded executable would then be executed on the victim's machine.

Recommendations: For versions prior to 4.1.21.90, update to version 4.1.21.90 or later to resolve the issue. As a temporary workaround, consider restricting access to the update mechanism to minimize the risk of exploitation. Avoid using insecure HTTP connections for downloading updates until the issue is resolved.

Exploit

Fix

Weakness Enumeration

CWE-494

Related Identifiers

CVE-2021-33879

Affected Products

Tencent Gameloop

References · 5

• 🔥 https://github.com/mmiszczyk/cve-2021-33879 · Exploit
• https://osv.dev/vulnerability/CVE-2021-33879 · Vendor Advisory
• https://gameloop.com · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33879 · Security Note
• https://t.me/cvenotify/15659 · Telegram Post