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2 vulnerabilities by Valve Software
CVE-2017-20205 (GCVE-0-2017-20205)
Vulnerability from cvelistv5 – Published: 2025-10-15 01:23 – Updated: 2025-11-21 14:19
VLAI
Title
Valve Source SDK Stack-Based Buffer Overflow RCE
Summary
Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function `nexttoken` copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When `ParseKeyValue` processes a collisionpair rule longer than the destination buffer (256 bytes), an overflow of the stack buffer `szToken` can occur and overwrite the function return address. A remote attacker can trigger the vulnerable code by supplying a specially crafted ragdoll model which causes the oversized collisionpair rule to be parsed, resulting in remote code execution on affected clients or servers. Valve has addressed this issue in many of their Source games, but independently-developed games must manually apply patch.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.oneupsecurity.com/research/remote-cod… | technical-descriptionpatch |
| https://github.com/ValveSoftware/source-sdk-2013 | product |
| https://www.vulncheck.com/advisories/valve-source… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Valve Software | Source SDK (source-sdk-2013) |
Affected:
source-sdk-2013
|
Credits
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CVE-2017-20205 (GCVE-0-2017-20205)
Vulnerability from nvd – Published: 2025-10-15 01:23 – Updated: 2025-11-21 14:19
VLAI
Title
Valve Source SDK Stack-Based Buffer Overflow RCE
Summary
Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function `nexttoken` copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When `ParseKeyValue` processes a collisionpair rule longer than the destination buffer (256 bytes), an overflow of the stack buffer `szToken` can occur and overwrite the function return address. A remote attacker can trigger the vulnerable code by supplying a specially crafted ragdoll model which causes the oversized collisionpair rule to be parsed, resulting in remote code execution on affected clients or servers. Valve has addressed this issue in many of their Source games, but independently-developed games must manually apply patch.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.oneupsecurity.com/research/remote-cod… | technical-descriptionpatch |
| https://github.com/ValveSoftware/source-sdk-2013 | product |
| https://www.vulncheck.com/advisories/valve-source… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Valve Software | Source SDK (source-sdk-2013) |
Affected:
source-sdk-2013
|
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