What is CVE-2021-33879?

CVE-2021-33879 is a vulnerability in Tencent GameLoop before version 4.1.21.90 that allows a malicious attacker in an MITM position to spoof the contents of an XML document describing an update package.

How does CVE-2021-33879 work?

CVE-2021-33879 works by downloading updates over an insecure HTTP connection, allowing an attacker to replace a download URL with one pointing to an arbitrary Windows executable.

What is the severity of CVE-2021-33879?

The severity of CVE-2021-33879 is high, with a CVSS score of 8.1.

How can I fix CVE-2021-33879?

To fix CVE-2021-33879, update Tencent GameLoop to version 4.1.21.90 or higher, which addresses the vulnerability and uses secure HTTPS connections for downloading updates.

Where can I find more information about CVE-2021-33879?

You can find more information about CVE-2021-33879 on the GitHub repository https://github.com/mmiszczyk/cve-2021-33879 and the official GameLoop website https://www.gameloop.com.

Vulnerability/
CVE-2021-33879

high

8.1

CWE

494

6/6/2021

4/8/2024

CVE-2021-33879

First published: Sun Jun 06 2021(Updated: )

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.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Tencent GameLoop	<4.1.21.90

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Frequently Asked Questions

What is CVE-2021-33879?
CVE-2021-33879 is a vulnerability in Tencent GameLoop before version 4.1.21.90 that allows a malicious attacker in an MITM position to spoof the contents of an XML document describing an update package.
How does CVE-2021-33879 work?
CVE-2021-33879 works by downloading updates over an insecure HTTP connection, allowing an attacker to replace a download URL with one pointing to an arbitrary Windows executable.
What is the severity of CVE-2021-33879?
The severity of CVE-2021-33879 is high, with a CVSS score of 8.1.
How can I fix CVE-2021-33879?
To fix CVE-2021-33879, update Tencent GameLoop to version 4.1.21.90 or higher, which addresses the vulnerability and uses secure HTTPS connections for downloading updates.
Where can I find more information about CVE-2021-33879?
You can find more information about CVE-2021-33879 on the GitHub repository https://github.com/mmiszczyk/cve-2021-33879 and the official GameLoop website https://www.gameloop.com.

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