CVE-2022-31180 : SHESCAPE UP TO 1.5.7/1.5.8 REGULAR EXPRESSION ESCAPE/ESCAPEALL INJECTION

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 which you can upgrade to now. No further changes are required. Behaviour number 2, 3, and 4 have been patched in 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 (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.

References

https://github.com/ericcornelissen/shescape/security/advisories/GHSA-44vr-rwwj-p88h

https://github.com/ericcornelissen/shescape/pull/322

https://github.com/ericcornelissen/shescape/pull/324

https://github.com/ericcornelissen/shescape/releases/tag/v1.5.7

https://github.com/ericcornelissen/shescape/releases/tag/v1.5.8

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