Remote code execution in Valve Counter-Strike: Global Offensive

Published: 2019-09-20 | Updated: 2019-09-20
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-15943
CWE ID CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software Counter-Strike Global Offensive Subscribe
Vendor Valve Software

Security Advisory

This security advisory describes one high risk vulnerability.

1) Input validation error

Severity: High

CVSSv3: 7.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-15943

CWE-ID: CWE-20 - Improper Input Validation

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, 1.35.0.1, 1.35.0.4, 1.35.0.6, 1.35.2.0, 1.35.2.1, 1.35.2.2, 1.35.2.3, 1.35.2.4, 1.35.2.6, 1.35.2.7, 1.35.2.8, 1.35.2.9, 1.35.3.0, 1.35.3.1, 1.35.3.2, 1.35.3.3, 1.35.3.4, 1.35.3.5, 1.35.4.1, 1.35.4.2, 1.35.4.3, 1.35.4.4, 1.35.4.5, 1.35.4.6, 1.35.5.2, 1.35.5.4, 1.35.5.5, 1.35.5.6, 1.35.5.7, 1.35.5.8, 1.35.5.9, 1.35.6.0, 1.35.6.1, 1.35.6.2, 1.35.6.3, 1.35.6.4, 1.35.6.5, 1.35.6.6, 1.35.6.7, 1.35.6.8, 1.35.6.9, 1.35.7.0, 1.35.7.1, 1.35.7.2, 1.35.7.3, 1.35.7.4, 1.35.7.5, 1.35.7.6, 1.35.7.7, 1.35.7.8, 1.35.7.9, 1.35.8.0, 1.35.8.1, 1.35.8.2, 1.35.8.3, 1.35.8.4, 1.35.8.8, 1.35.8.9, 1.35.9.5, 1.35.9.6, 1.35.9.7, 1.36.0.6, 1.36.0.8, 1.36.0.9, 1.36.1.0, 1.36.1.1, 1.36.1.2, 1.36.1.3, 1.36.1.4, 1.36.1.5, 1.36.1.6, 1.36.1.7, 1.36.1.8, 1.36.1.9, 1.36.2.0, 1.36.2.1, 1.36.2.2, 1.36.2.3, 1.36.2.5, 1.36.2.6, 1.36.2.7, 1.36.2.8, 1.36.2.9, 1.36.3.0, 1.36.3.1, 1.36.3.2, 1.36.3.3, 1.36.3.4, 1.36.3.6, 1.36.3.7, 1.36.3.8, 1.36.4.0, 1.36.4.1, 1.36.4.2, 1.36.4.3, 1.36.4.4, 1.36.4.5, 1.36.4.6, 1.36.4.7, 1.36.4.8, 1.36.4.9, 1.36.5.0, 1.36.5.1, 1.36.5.2, 1.36.5.3, 1.36.5.4, 1.36.5.5, 1.36.5.6, 1.36.5.7, 1.36.5.8, 1.36.5.9, 1.36.6.0, 1.36.6.1, 1.36.6.2, 1.36.6.3, 1.36.6.4, 1.36.6.6, 1.36.6.7, 1.36.6.8, 1.36.6.9, 1.36.7.0, 1.36.7.1, 1.36.7.3, 1.36.7.4, 1.36.7.5, 1.36.7.6, 1.36.7.7, 1.36.7.8, 1.36.7.9, 1.36.8.0, 1.36.8.1, 1.36.8.2, 1.36.8.3, 1.36.8.4, 1.36.8.6, 1.36.8.7, 1.36.8.8, 1.36.8.9, 1.36.9.0, 1.36.9.2, 1.36.9.3, 1.36.9.4, 1.36.9.5, 1.36.9.6, 1.36.9.7, 1.36.9.8, 1.36.9.9, 1.37.0.0, 1.37.0.1, 1.37.0.2, 1.37.0.3, 1.37.0.4, 1.37.0.5, 1.37.0.6, 1.37.0.7, 1.37.0.8, 1.37.0.9, 1.37.1.0

CPE 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.