CVE-2021-33879

Tencent GameLoop before 4.1.21.90 downloaded updates over an insecure HTTP connection. A malicious attacker in an MITM position could spoof the contents of an XML document describing an update package, replacing a download URL with one pointing to an arbitrary Windows executable. Because the only integrity check would be 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.

CVSS v3.1

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS

1.02% chance of exploitation in the next 30 days, 61th percentile

Published

2021-06-06

Updated

2024-08-04

Proof-of-concept exploits (1)

• mmiszczyk/cve-2021-338790★ · 2021-06-06

References

• CVE Record
• NVD entry

Related

• CVE-2021-33851
• CVE-2021-33887
• CVE-2021-33839
• CVE-2021-33904
• CVE-2021-33833
• CVE-2021-33909