CVE-2022-25918: Regular Expression Denial of Service (ReDoS)
First published: Tue Oct 25 2022(Updated: )
### Impact This impacts users that use shescape to escape arguments: - for the Unix shell Bash, or any not-officially-supported Unix shell; - using the `escape` or `escapeAll` functions with the `interpolation` option set to `true`. An attacker can cause polynomial backtracking in terms of the input string length due to a Regular Expression in shescape that is vulnerable to Regular Expression Denial of Service (ReDoS). Example: ```javascript import * as shescape from "shescape"; /* 1. Prerequisites */ const options = { interpolation: true, // and shell: "/bin/bash", // or shell: "some-not-officially-supported-shell", // or shell: undefined, // Only if the system's default shell is bash or an unsupported shell. }; /* 2. Attack */ let userInput = '{,'.repeat(150_000); // polynomial backtracking /* 3. Usage */ shescape.escape(userInput, options); // or shescape.escapeAll([userInput], options); ``` ### Patches This bug has been patched in [v1.6.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.6.1) which you can upgrade to now. No further changes required. ### Workarounds Alternatively, a maximum length can be enforced on input strings to shescape to reduce the impact of the vulnerability. It is not recommended to try and detect vulnerable input strings, as the logic for this may end up being vulnerable to ReDoS itself. ### References - Shescape commit [552e8ea](https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9) - Shescape Release [v1.6.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.6.1) ### For more information - Comment on commit [552e8ea](https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9) - Open an issue at [https://github.com/ericcornelissen/shescape/issues](https://github.com/ericcornelissen/shescape/issues?q=is%3Aissue+is%3Aopen) (New issue > Question > Get started)
Credit: report@snyk.io report@snyk.io
| Affected Software | Affected Version | How to fix |
|---|---|---|
| npm/shescape | >=1.5.10<1.6.1 | 1.6.1 |
| Shescape Project Shescape Node.js | =1.5.10 | |
| Shescape Project Shescape Node.js | =1.6.0 |
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Reference Links
- https://github.com/ericcornelissen/shescape/blob/main/src/unix.js%23L52
- https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9
- https://github.com/ericcornelissen/shescape/releases/tag/v1.6.1
- https://security.snyk.io/vuln/SNYK-JS-SHESCAPE-3061108
- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-cr84-xvw4-qx3c
- https://nvd.nist.gov/vuln/detail/CVE-2022-25918
- https://github.com/advisories/GHSA-cr84-xvw4-qx3c (Advisory)
Frequently Asked Questions
What is the impact of CVE-2022-25918?
The vulnerability allows an attacker to cause polynomial backtracking, leading to Denial of Service (DoS).
Which versions of shescape are affected by CVE-2022-25918?
Versions 1.5.10 to 1.6.0 of shescape are vulnerable.
How can I fix CVE-2022-25918?
Upgrade to version 1.6.1 of shescape to fix the vulnerability.
Where can I find more information about CVE-2022-25918?
You can find more information about CVE-2022-25918 in the following references: [GitHub Advisory](https://github.com/ericcornelissen/shescape/security/advisories/GHSA-cr84-xvw4-qx3c), [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-25918), [GitHub Commit](https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9).
- collector/github-advisory-latest
- alias/GHSA-cr84-xvw4-qx3c
- alias/CVE-2022-25918
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- version/shescape project shescape node.js/1.6.0