rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Certain configurations of rails-html-sanitizer < 1.4.4 use an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption. This issue has been patched in version 1.4.4.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Rails_html_sanitizers | Rubyonrails | * | 1.4.4 (excluding) |
| Red Hat Satellite 6.13 for RHEL 8 | RedHat | rubygem-rails-html-sanitizer-0:1.4.4-1.el8sat | * |
| Ruby-rails-html-sanitizer | Ubuntu | bionic | * |
| Ruby-rails-html-sanitizer | Ubuntu | kinetic | * |
| Ruby-rails-html-sanitizer | Ubuntu | lunar | * |
| Ruby-rails-html-sanitizer | Ubuntu | mantic | * |
| Ruby-rails-html-sanitizer | Ubuntu | trusty | * |
| Ruby-rails-html-sanitizer | Ubuntu | xenial | * |
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.