An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libecap-develUpgrade libecap | May 4, 2022 | Nov 26, 2019 |
| Alpine Linux | — | Upgrade squid | Jan 19, 2021 | Nov 26, 2019 |
| Amazon Linux Ami 2 | — | Upgrade squidUpgrade squid-sysvinitUpgrade squid-debuginfoUpgrade squid-migration-script | Sep 28, 2023 | Nov 26, 2019 |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Nov 26, 2019 | |
| Centos_linux | — | Upgrade squid-debugsourceUpgrade libecap-debugsourceUpgrade libecap-debuginfoUpgrade squid-debuginfoUpgrade squidUpgrade libecap-develUpgrade libecap | Nov 5, 2020 | Nov 26, 2019 |
| Debian | — | Upgrade squid | Dec 12, 2019 | Nov 26, 2019 |
| Gentoo Linux | — | Upgrade net-proxy/squid. | Mar 17, 2020 | Nov 26, 2019 |
| Huawei Euleros 2_0_sp5 | — | Upgrade squid | Feb 24, 2020 | Nov 26, 2019 |
| Huawei Euleros 2_0_sp8 | — | Upgrade squid | Jan 3, 2020 | Nov 26, 2019 |
| Oracle Solaris | — | Upgrade web/proxy/squid to version 4.10-11.4.21.0.1.69.0 on Solaris 11.4 | Jan 19, 2021 | Nov 26, 2019 |
| Oracle_linux | — | Upgrade libecap-develUpgrade squidUpgrade libecap | Jul 22, 2024 | Nov 5, 2019 |
| Redhat_linux | — | Upgrade libecap-develUpgrade libecap-debuginfoUpgrade libecapUpgrade squid-debuginfoUpgrade libecap-debugsourceUpgrade squid-debugsourceUpgrade squidNo solution exists | Nov 5, 2020 | Nov 26, 2019 |
| Rocky_linux | rocky-upgrade-libecaprocky-upgrade-libecap-debuginforocky-upgrade-libecap-debugsourcerocky-upgrade-libecap-devel | Mar 12, 2024 | Nov 26, 2019 | |
| Suse | — | suse-upgrade-squidsuse-upgrade-squid3 | Nov 22, 2019 | Nov 14, 2019 |
| Ubuntu | ubuntu-upgrade-squidubuntu-upgrade-squid3 | Dec 5, 2019 | Nov 14, 2019 |
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