Vulnerability-Lookup

GHSA-G2MQ-5MGX-WG6W

Vulnerability from github – Published: 2025-10-15 03:30 – Updated: 2025-10-15 03:30

Details

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

9.2 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2017-20205"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-15T02:15:31Z",
    "severity": "CRITICAL"
  },
  "details": "Valve\u0027s Source SDK (source-sdk-2013)\u0027s 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.",
  "id": "GHSA-g2mq-5mgx-wg6w",
  "modified": "2025-10-15T03:30:40Z",
  "published": "2025-10-15T03:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-20205"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ValveSoftware/source-sdk-2013"
    },
    {
      "type": "WEB",
      "url": "https://www.oneupsecurity.com/research/remote-code-execution-in-source-games"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/valve-source-sdk-stack-based-buffer-overflow-rce"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2017-20205 (GCVE-0-2017-20205)

Vulnerability from cvelistv5 – Published: 2025-10-15 01:23 – Updated: 2025-11-21 14:19

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

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck

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

One Up Security, LLC

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-G2MQ-5MGX-WG6W

CVE-2017-20205 (GCVE-0-2017-20205)

Tags

Sightings

Nomenclature