Vulnerability identifier: #VU48929

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-6019

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Game Networking Sockets
Client/Desktop applications / Games

Vendor: Valve Software

Description

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

The vulnerability exists due to insufficient validation of inlined statistic messages within the CConnectionTransportUDPBase::Received_Data() function. A remote attacker can pass specially crafted input to the gaming server and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Game Networking Sockets: 1.0.0 - 1.1.0

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External links
http://github.com/ValveSoftware/GameNetworkingSockets/commit/d944a10808891d202bb1d5e1998de6e0423af678
http://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/

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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.