An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade squid | Jan 4, 2021 | Sep 2, 2020 |
| Amazon Linux Ami 2 | — | Upgrade squid-sysvinitUpgrade squid-debuginfoUpgrade squid-migration-scriptUpgrade squid | Oct 28, 2020 | Sep 2, 2020 |
| Amazon_linux | — | Upgrade squid | Nov 18, 2020 | Aug 27, 2020 |
| Centos_linux | — | Upgrade squidUpgrade libecap-develUpgrade squid-debugsourceUpgrade libecap-debugsourceUpgrade squid-migration-scriptUpgrade squid-debuginfoUpgrade libecap-debuginfoUpgrade libecapUpgrade squid-sysvinit | Sep 4, 2020 | Sep 2, 2020 |
| Debian | — | Upgrade squid | Aug 31, 2020 | Aug 31, 2020 |
| Huawei Euleros 2_0_sp2 | — | Upgrade squidUpgrade squid-migration-script | Feb 22, 2021 | Sep 2, 2020 |
| Huawei Euleros 2_0_sp3 | — | Upgrade squidUpgrade squid-migration-script | Jan 20, 2021 | Sep 2, 2020 |
| Huawei Euleros 2_0_sp5 | — | Upgrade squid | Nov 2, 2020 | Sep 2, 2020 |
| Huawei Euleros 2_0_sp8 | — | Upgrade squid | Nov 3, 2020 | Sep 2, 2020 |
| Oracle_linux | — | Upgrade libecap-develUpgrade squid-migration-scriptUpgrade squidUpgrade squid-sysvinitUpgrade libecap | Sep 5, 2020 | Aug 23, 2020 |
| Redhat_linux | — | Upgrade libecap-debugsourceUpgrade squid-migration-scriptUpgrade squidUpgrade libecap-debuginfoUpgrade squid-debugsourceUpgrade squid-debuginfoUpgrade libecap-develUpgrade libecapUpgrade squid-sysvinitNo solution exists | Sep 4, 2020 | Sep 2, 2020 |
| Rocky_linux | — | Upgrade libecap-debugsourceUpgrade libecap-develUpgrade libecap-debuginfoUpgrade libecap | Mar 12, 2024 | Sep 2, 2020 |
| Suse | — | Upgrade squidUpgrade squid3 | Sep 4, 2020 | Aug 27, 2020 |
| Ubuntu | — | Upgrade squid | Aug 28, 2020 | Aug 27, 2020 |
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