Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem _cannot_ be mitigated by denying ICP queries using `icp_access` rules. This bug is fixed in Squid version 7.5.
| Vendor | Product | Versions |
|---|---|---|
| squid-cache | squid | < 7.5, 3.x -> 3.5.28, 4.x -> 4.17, 5.x -> 5.9, 6.x -> 6.14, 7.x -> 7.4 |
Updated exploit availability to true, marked as actively exploited, and confirmed patch version 7.5.
Updated affected versions to include Squid 3.x to 7.x, marked exploit as available and actively exploited, and confirmed patch available in version 7.5.
Initial creation
