#VU33450 Integer overflow - CVE-2018-20177

Vulnerability identifier: #VU33450

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-20177

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in function rdp_in_unistr(). A remote attacker can send a crafted request to the affected application, trigger memory corruption and possibly even a remote code execution.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

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