Nokogiri is an open source XML and HTML library for Ruby. Nokogiri < v1.13.4 contains an inefficient regular expression that is susceptible to excessive backtracking when attempting to detect encoding in HTML documents. Users are advised to upgrade to Nokogiri >= 1.13.4. There are no known workarounds for this issue.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nokogiri | Nokogiri | * | 1.13.4 (excluding) |
| Red Hat Satellite 6.12 for RHEL 8 | RedHat | rubygem-nokogiri-0:1.13.8-1.el8sat | * |
| Red Hat Satellite 6.12 for RHEL 8 | RedHat | rubygem-nokogiri-0:1.13.8-1.el8sat | * |
| Ruby-nokogiri | Ubuntu | bionic | * |
| Ruby-nokogiri | Ubuntu | esm-apps/bionic | * |
| Ruby-nokogiri | Ubuntu | esm-apps/focal | * |
| Ruby-nokogiri | Ubuntu | esm-apps/jammy | * |
| Ruby-nokogiri | Ubuntu | esm-apps/xenial | * |
| Ruby-nokogiri | Ubuntu | esm-infra-legacy/trusty | * |
| Ruby-nokogiri | Ubuntu | focal | * |
| Ruby-nokogiri | Ubuntu | impish | * |
| Ruby-nokogiri | Ubuntu | jammy | * |
| Ruby-nokogiri | Ubuntu | kinetic | * |
| Ruby-nokogiri | Ubuntu | trusty | * |
| Ruby-nokogiri | Ubuntu | trusty/esm | * |
| Ruby-nokogiri | Ubuntu | upstream | * |
| Ruby-nokogiri | Ubuntu | xenial | * |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.