FreeRDP up to 2.11.5/3.4.x /gfx integer overflow

Summaryinfo

A vulnerability marked as very critical has been reported in FreeRDP up to 2.11.5/3.4.x. Affected is an unknown function of the file /gfx. The manipulation leads to integer overflow. This vulnerability is referenced as CVE-2024-32039. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in FreeRDP up to 2.11.5/3.4.x. It has been rated as very critical. This issue affects an unknown code of the file /gfx. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FreeRDP is a free implementation of the Remote Desktop Protocol. FreeRDP based clients using a version of FreeRDP prior to 3.5.0 or 2.11.6 are vulnerable to integer overflow and out-of-bounds write. Versions 3.5.0 and 2.11.6 patch the issue. As a workaround, do not use `/gfx` options (e.g. deactivate with `/bpp:32` or `/rfx` as it is on by default).

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-32039 since 04/09/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/20/2024).

The vulnerability scanner Nessus provides a plugin with the ID 211551 (Oracle Linux 9 : freerdp (ELSA-2024-9092)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.11.6 or 3.5.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (211551). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 2.11.0
• 2.11.1
• 2.11.2
• 2.11.3
• 2.11.4
• 2.11.5
• 3.0
• 3.1
• 3.2
• 3.3
• 3.4

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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