Remote code execution in Valve Counter-Strike: Global Offensive

1) Input validation error

EUVDB-ID: #VU21234

Risk: High

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2019-15943

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the "vphysics.dll". A remote attacker can create a gaming server, invite a victim to this server, because a crafted map is mishandled during a memset call and execute arbitrary code or cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Counter-Strike Global Offensive: 1.34.9.8 - 1.37.1.0

CPE2.3

• cpe:2.3:a:valve_software:counter-strike_global_offensive:1.34.9.8:*:*:*:*:*:*:*
• cpe:2.3:a:valve_software:counter-strike_global_offensive:1.35.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:valve_software:counter-strike_global_offensive:1.35.0.4:*:*:*:*:*:*:*

External links

https://blog.counter-strike.net/index.php/category/updates/
https://github.com/bi7s/CVE/blob/master/CVE-2019-15943/README.md

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

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.