Tóm tắt nhanh
- CVE-2022-31129 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng Moment.js, moment (momentjs), moment.
- Xác suất bị khai thác trong 30 ngày tới (EPSS): 5.6%, cao hơn 92.8% các lỗ hổng khác.
- Cách xử lý: cập nhật lên 2.29.4 hoặc mới hơn.
| Gói / sản phẩm | Phiên bản bị ảnh hưởng | Phiên bản đã vá |
|---|
| Moment.js NuGet | ≥ 2.18.0, < 2.29.4
| 2.29.4
|
| moment | ≥ 2.18.0, < 2.29.4
| 2.29.4
|
| moment npm | ≥ 2.18.0, < 2.29.4
| 2.29.4
|
Mô tả
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: https://github.com/moment/moment/pull/6015#issuecomment-1152961973=
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.
Mô tả của NVD
moment is a JavaScript date library for parsing, validating, manipulating, and formatting dates. Affected versions of moment were found to use an inefficient parsing algorithm. Specifically using string-to-date parsing in moment (more specifically rfc2822 parsing, which is tried by default) has quadratic (N^2) complexity on specific inputs. Users may notice a 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. The problem is patched in 2.29.4, the patch can be applied to all affected versions with minimal tweaking. Users are advised to upgrade. Users unable to upgrade should consider limiting date lengths accepted from user input.
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