Vulnerability identifier: #VU80354

Vulnerability risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2023-40181

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeRDP
Universal components / Libraries / Libraries used by multiple products

Vendor: FreeRDP

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer underflow in zgfx_decompress_segment. A remote attacker can send a specially crafted request to the affected application, trigger integer underflow and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRDP: 2.0.0 - 3.0.0 beta2

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External links
http://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mxp4-rx7x-h2g8
http://github.com/FreeRDP/FreeRDP/blob/2252d53001d9ce8a452f0a0a5b1f5ed9db6d57f1/libfreerdp/codec/zgfx.c#L256-L261
http://github.com/FreeRDP/FreeRDP/blob/2252d53001d9ce8a452f0a0a5b1f5ed9db6d57f1/libfreerdp/codec/zgfx.c#L334-L355

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.