Multiple vulnerabilities in Valve Game Networking Sockets
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2020-6016 CVE-2020-6017 CVE-2020-6018 CVE-2020-6019 |
| CWE-ID | CWE-787 CWE-121 CWE-20 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Public exploit code for vulnerability #4 is available. |
| Vulnerable software Subscribe |
Game Networking Sockets Client/Desktop applications / Games |
| Vendor | Valve Software |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU48926
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-2020-6016
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input within the SNP_ReceiveUnreliableSegment() function. A remote attacker can send specially crafted packets to the application, trigger an out-of-bounds write and execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsGame Networking Sockets: 1.0.0 - 1.1.0
External linkshttp://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
http://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
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.
2) Out-of-bounds write
EUVDB-ID: #VU48927
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-6017
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input within the SNP_ReceiveUnreliableSegment(), when configured to support plain-text messages. A remote attacker can send specially crafted packets to the application, trigger out-of-bounds write and execute arbitrary code on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsGame Networking Sockets: 1.0.0 - 1.1.0
External linkshttp://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
http://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
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.
3) Stack-based buffer overflow
EUVDB-ID: #VU48928
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-6018
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing long encrypted messages within the AES_GCM_DecryptContext::Decrypt() function. A remote unauthenticated attacker can send specially crafted messages to the application, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsGame Networking Sockets: 1.0.0 - 1.1.0
External linkshttp://github.com/ValveSoftware/GameNetworkingSockets/commit/bea84e2844b647532a9b7fbc3a6a8989d66e49e3
http://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
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.
4) Input validation error
EUVDB-ID: #VU48929
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-6019
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsGame Networking Sockets: 1.0.0 - 1.1.0
External linkshttp://github.com/ValveSoftware/GameNetworkingSockets/commit/d944a10808891d202bb1d5e1998de6e0423af678
http://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
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.
