high
8.8
CWE
787
Advisory Published
Updated

CVE-2021-41160: Improper region checks in FreeRDP allow out of bound write to memory

First published: Thu Oct 21 2021(Updated: )

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. In affected versions a malicious server might trigger out of bound writes in a connected client. Connections using GDI or SurfaceCommands to send graphics updates to the client might send `0` width/height or out of bound rectangles to trigger out of bound writes. With `0` width or heigth the memory allocation will be `0` but the missing bounds checks allow writing to the pointer at this (not allocated) region. This issue has been patched in FreeRDP 2.4.1.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
FreeRDP FreeRDP<2.4.1
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Fedoraproject Fedora=35

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-41160?

    CVE-2021-41160 is a vulnerability in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP), that can be triggered by a malicious server causing out of bound writes in a connected client.

  • How does CVE-2021-41160 affect FreeRDP?

    CVE-2021-41160 affects FreeRDP versions up to and exclusive of 2.4.1.

  • What is the severity of CVE-2021-41160?

    CVE-2021-41160 has a severity rating of 8.8 (high).

  • How can CVE-2021-41160 be exploited?

    CVE-2021-41160 can be exploited by a malicious server sending specific graphics updates to a connected client.

  • How can I fix CVE-2021-41160?

    To fix CVE-2021-41160, users should update to a version of FreeRDP that is greater than or equal to 2.4.1.

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