Squid before 4.9, when certain web browsers are used, mishandles HTML in the host (aka hostname) parameter to cachemgr.cgi.
Weakness
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Squid | Squid-cache | * | 4.9 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | squid:4-8030020200828070549.30b713e6 | * |
| Squid | Ubuntu | eoan | * |
| Squid | Ubuntu | trusty | * |
| Squid3 | Ubuntu | bionic | * |
| Squid3 | Ubuntu | esm-infra/bionic | * |
| Squid3 | Ubuntu | esm-infra/xenial | * |
| Squid3 | Ubuntu | precise/esm | * |
| Squid3 | Ubuntu | trusty | * |
| Squid3 | Ubuntu | xenial | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/10.html
- https://cwe.mitre.org/data/definitions/101.html
- https://cwe.mitre.org/data/definitions/105.html
- https://cwe.mitre.org/data/definitions/108.html
- https://cwe.mitre.org/data/definitions/120.html
- https://cwe.mitre.org/data/definitions/13.html
- https://cwe.mitre.org/data/definitions/135.html
- https://cwe.mitre.org/data/definitions/14.html
- https://cwe.mitre.org/data/definitions/24.html
- https://cwe.mitre.org/data/definitions/250.html
- https://cwe.mitre.org/data/definitions/267.html
- https://cwe.mitre.org/data/definitions/273.html
- https://cwe.mitre.org/data/definitions/28.html
- https://cwe.mitre.org/data/definitions/3.html
- https://cwe.mitre.org/data/definitions/34.html
- https://cwe.mitre.org/data/definitions/42.html
- https://cwe.mitre.org/data/definitions/43.html
- https://cwe.mitre.org/data/definitions/45.html
- https://cwe.mitre.org/data/definitions/46.html
- https://cwe.mitre.org/data/definitions/47.html
- https://cwe.mitre.org/data/definitions/51.html
- https://cwe.mitre.org/data/definitions/52.html
- https://cwe.mitre.org/data/definitions/53.html
- https://cwe.mitre.org/data/definitions/6.html
- https://cwe.mitre.org/data/definitions/64.html
- https://cwe.mitre.org/data/definitions/67.html
- https://cwe.mitre.org/data/definitions/7.html
- https://cwe.mitre.org/data/definitions/71.html
- https://cwe.mitre.org/data/definitions/72.html
- https://cwe.mitre.org/data/definitions/76.html
- https://cwe.mitre.org/data/definitions/78.html
- https://cwe.mitre.org/data/definitions/79.html
- https://cwe.mitre.org/data/definitions/8.html
- https://cwe.mitre.org/data/definitions/80.html
- https://cwe.mitre.org/data/definitions/83.html
- https://cwe.mitre.org/data/definitions/84.html
- https://cwe.mitre.org/data/definitions/9.html
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- https://github.com/squid-cache/squid/pull/504
- https://github.com/squid-cache/squid/pull/505
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://usn.ubuntu.com/4356-1/
- https://www.debian.org/security/2020/dsa-4732
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- http://www.openwall.com/lists/oss-security/2025/11/04/7
- http://www.openwall.com/lists/oss-security/2025/11/05/1
- http://www.openwall.com/lists/oss-security/2025/11/05/7
- https://github.com/squid-cache/squid/pull/504
- https://github.com/squid-cache/squid/pull/505
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://usn.ubuntu.com/4356-1/
- https://www.debian.org/security/2020/dsa-4732