CVE-2022-25918

描述

### 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)

如何修補 CVE-2022-25918

要修補 CVE-2022-25918,請將受影響套件升級到下列已修補版本。

• —升級至 1.6.1 或更新版本

CVE-2022-25918 正在被利用嗎?

低 — EPSS 為 1.2%,目前沒有觀察到大規模利用活動。

受影響套件(1)