Vulnerability identifier: #VU33452

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-20179

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: Yes

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

rdesktop versions up to and including v1.8.3 contain an Integer Underflow that leads to a Heap-Based Buffer Overflow in the function lspci_process() and results in memory corruption and probably even a remote code execution.

Mitigation
Install update from vendor's website.

External links
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00040.html
http://www.securityfocus.com/bid/106938
http://github.com/rdesktop/rdesktop/commit/4dca546d04321a610c1835010b5dad85163b65e1
http://lists.debian.org/debian-lts-announce/2019/02/msg00030.html
http://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/
http://security.gentoo.org/glsa/201903-06
http://www.debian.org/security/2019/dsa-4394

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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.