🚨 Inefficient Regular Expression Complexity in moment

Impact

• using string-to-date parsing in moment (more specifically rfc2822 parsing, which is tried by default) has quadratic (N^2) complexity on specific inputs
• noticeable slowdown is observed with inputs above 10k characters
• users who pass user-provided strings without sanity length checks to moment constructor are vulnerable to (Re)DoS attacks

Patches

The problem is patched in 2.29.4, the patch can be applied to all affected versions with minimal tweaking.

Workarounds

In general, given the proliferation of ReDoS attacks, it makes sense to limit the length of the user input to something sane, like 200 characters or less. I haven't seen legitimate cases of date-time strings longer than that, so all moment users who do pass a user-originating string to constructor are encouraged to apply such a rudimentary filter, that would help with this but also most future ReDoS vulnerabilities.

References

There is an excellent writeup of the issue here: #6015 (comment)

Details

The issue is rooted in the code that removes legacy comments (stuff inside parenthesis) from strings during rfc2822 parsing. moment("(".repeat(500000)) will take a few minutes to process, which is unacceptable.

🚨 Path Traversal: 'dir/../../filename' in moment.locale

Impact

This vulnerability impacts npm (server) users of moment.js, especially if user provided locale string, eg fr is directly used to switch moment locale.

Patches

This problem is patched in 2.29.2, and the patch can be applied to all affected versions (from 1.0.1 up until 2.29.1, inclusive).

Workarounds

Sanitize user-provided locale name before passing it to moment.js.

References

Are there any links users can visit to find out more?

For more information

If you have any questions or comments about this advisory:

• Open an issue in moment repo

2.30.1 (from changelog)

• Release Dec 27, 2023
• Revert #5827, because it's breaking a lot of TS code.

2.30.0 (from changelog)

• Release Dec 26, 2023

2.29.4 (from changelog)

• Release Jul 6, 2022
  • #6015 [bugfix] Fix ReDoS in preprocessRFC2822 regex

2.29.2 (from changelog)

• Release Apr 3 2022

Address https://github.com/advisories/GHSA-8hfj-j24r-96c4

Does any of this look wrong? Please let us know.

See the full diff on Github. The new version differs by more commits than we can show here.

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