[Security] Bump color-string from 1.5.4 to 1.5.5

Bumps color-string from 1.5.4 to 1.5.5. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Regular Expression Denial of Service (ReDOS) A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the application is provided and checks a crafted invalid HWB string.

Affected versions: < 1.5.5

Release notes

Sourced from color-string's releases.

1.5.5 (Patch/Security Release) - hwb() ReDos patch (low-severity)

Release notes copied verbatim from the commit message, which can be found here: 0789e21284c33d89ebc4ab4ca6f759b9375ac9d3

Discovered by Yeting Li, c/o Colin Ife via Snyk.io. A ReDos (Regular Expression Denial of Service) vulnerability was responsibly disclosed to me via email by Colin on Mar 5 2021 regarding an exponential time complexity for linearly increasing input lengths for hwb() color strings. Strings reaching more than 5000 characters would see several milliseconds of processing time; strings reaching more than 50,000 characters began seeing 1500ms (1.5s) of processing time. The cause was due to a the regular expression that parses hwb() strings - specifically, the hue value - where the integer portion of the hue value used a 0-or-more quantifier shortly thereafter followed by a 1-or-more quantifier. This caused excessive backtracking and a cartesian scan, resulting in exponential time complexity given a linear increase in input length. Thank you Yeting Li and Colin Ife for bringing this to my attention in a secure, responsible and professional manner.

A CVE will not be assigned for this vulnerability.

Commits

966ae4d 1.5.5
0789e21 fix ReDos in hwb() parser (low-severity)
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concordnow / tinymce-ember

[Security] Bump color-string from 1.5.4 to 1.5.5 #100

1.5.5 (Patch/Security Release) - hwb() ReDos patch (low-severity)