CVE-2021-41159: Improper client input validation for FreeRDP gateway connections allows to overwrite memory
First published: Thu Oct 21 2021(Updated: )
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. All FreeRDP clients prior to version 2.4.1 using gateway connections (`/gt:rpc`) fail to validate input data. A malicious gateway might allow client memory to be written out of bounds. This issue has been resolved in version 2.4.1. If you are unable to update then use `/gt:http` rather than /gt:rdp connections if possible or use a direct connection without a gateway.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeRDP FreeRDP | <2.4.1 | |
| Fedoraproject Fedora | =35 |
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Reference Links
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vh34-m9h7-95xq
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DWJXQOWKNR7O5HM2HFJOM4GBUFPTE3RG/
- https://security.gentoo.org/glsa/202210-24
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DWJXQOWKNR7O5HM2HFJOM4GBUFPTE3RG/
Frequently Asked Questions
What is CVE-2021-41159?
CVE-2021-41159 is a vulnerability that affects all FreeRDP clients prior to version 2.4.1.
What is FreeRDP?
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP) released under the Apache license.
How does CVE-2021-41159 impact FreeRDP?
CVE-2021-41159 allows a malicious gateway to write client memory out of bounds in FreeRDP clients using gateway connections (`/gt:rpc`).
What is the severity of CVE-2021-41159?
CVE-2021-41159 has a severity rating of 8.8 (high).
How do I fix CVE-2021-41159?
To fix CVE-2021-41159, users should update their FreeRDP clients to version 2.4.1 or later.
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