A Regular Expression Denial of Service (ReDoS) issue was discovered in Puppet Server 7.9.2 certificate validation. An issue related to specifically crafted certificate names significantly slowed down server operations.
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 |
|---|---|---|---|
| Puppet_enterprise | Puppet | 2021.7.1 (including) | 2021.7.1 (including) |
| Puppet_enterprise | Puppet | 2023.0 (including) | 2023.0 (including) |
| Puppet_server | Puppet | 7.9.2 (including) | 7.9.2 (including) |
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.