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.
CVSS
No CVSS.
References
Configurations
No configuration.
History
15 Oct 2025, 02:15
| Type | Values Removed | Values Added |
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Information
Published : 2025-10-15 02:15
Updated : 2025-10-16 15:29
NVD link : CVE-2017-20205
Mitre link : CVE-2017-20205
CVE.ORG link : CVE-2017-20205
JSON object : View
Products Affected
No product.
CWE
CWE-121
Stack-based Buffer Overflow