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.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade squid | Jan 4, 2021 | Sep 2, 2020 |
| Amazon Linux Ami 2 | — | Upgrade squidUpgrade squid-debuginfoUpgrade squid-sysvinitUpgrade squid-migration-script | Oct 28, 2020 | Sep 2, 2020 |
| Amazon_linux | — | Upgrade squid | Nov 18, 2020 | Aug 27, 2020 |
| Centos_linux | — | Upgrade squidUpgrade squid-debugsourceUpgrade squid-sysvinitUpgrade libecap-develUpgrade libecap-debugsourceUpgrade libecapUpgrade squid-migration-scriptUpgrade squid-debuginfoUpgrade libecap-debuginfo | Sep 4, 2020 | Sep 2, 2020 |
| Debian | — | Upgrade squid | Aug 31, 2020 | Aug 31, 2020 |
| Huawei Euleros 2_0_sp2 | — | Upgrade squid-migration-scriptUpgrade squid | 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 squidUpgrade squid-migration-scriptUpgrade squid-sysvinitUpgrade libecap | Sep 5, 2020 | Aug 23, 2020 |
| Redhat_linux | — | Upgrade squidUpgrade squid-debuginfoUpgrade squid-debugsourceUpgrade squid-migration-scriptUpgrade libecap-debuginfoUpgrade libecap-develUpgrade libecap-debugsourceUpgrade squid-sysvinitUpgrade libecapNo solution exists | Sep 4, 2020 | Sep 2, 2020 |
| Rocky_linux | — | Upgrade libecapUpgrade libecap-debuginfoUpgrade libecap-develUpgrade libecap-debugsource | Mar 12, 2024 | Sep 2, 2020 |
| Suse | — | Upgrade squid3Upgrade squid | Sep 4, 2020 | Aug 27, 2020 |
| Ubuntu | — | Upgrade squid | Aug 28, 2020 | Aug 27, 2020 |
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