Vulnerability · Published Aug 1, 2022 · Assigned by GitHub_M
CVE-2022-31180Insufficient escaping of whitespace in shescape
Critical 9.8
In plain English
A critical-severity injection in shescape from ericcornelissen. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Shescape is a simple shell escape package for JavaScript. Affected versions were found to have insufficient escaping of white space when interpolating output. This issue only impacts users that use the `escape` or `escapeAll` functions with the `interpolation` option set to `true`. The result is that if an attacker is able to include whitespace in their input they can: 1. Invoke shell-specific behaviour through shell-specific special characters inserted directly after whitespace. 2. Invoke shell-specific behaviour through shell-specific special characters inserted or appearing after line terminating characters. 3. Invoke arbitrary commands by inserting a line feed character. 4. Invoke arbitrary commands by inserting a carriage return character. Behaviour number 1 has been patched in [v1.5.7] which you can upgrade to now. No further changes are required. Behaviour number 2, 3, and 4 have been patched in [v1.5.8] which you can upgrade to now. No further changes are required. The best workaround is to avoid having to use the `interpolation: true` option - in most cases using an alternative is possible, see [the recipes](https://github.com/ericcornelissen/shescape#recipes) for recommendations. Alternatively, users may strip all whitespace from user input. Note that this is error prone, for example: for PowerShell this requires stripping `'\u0085'` which is not included in JavaScript's definition of `\s` for Regular Expressions.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | shescape | 1.5.8 | GHSA-44vr-rwwj-p88h |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ericcornelissen | shescape | >=1.4.0 < 1.5.8 |
Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-44vr-rwwj-p88h x_refsource_CONFIRM
- https://github.com/ericcornelissen/shescape/pull/322 x_refsource_MISC
- https://github.com/ericcornelissen/shescape/pull/324 x_refsource_MISC
- https://github.com/ericcornelissen/shescape/releases/tag/v1.5.7 x_refsource_MISC
- https://github.com/ericcornelissen/shescape/releases/tag/v1.5.8 x_refsource_MISC