Vulnerability Description
An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling 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 proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | < 4.13 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 31 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlMailing ListThird Party Advisory
- https://github.com/squid-cache/squid/security/advisories/GHSA-3365-q9qx-f98mMitigationThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00005.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.netapp.com/advisory/ntap-20210219-0007/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0006/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210226-0007/Broken Link
- https://usn.ubuntu.com/4477-1/Third Party Advisory
- https://usn.ubuntu.com/4551-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4751Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2020-15810?
CVE-2020-15810 is a vulnerability with a CVSS score of 6.5 (MEDIUM). An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache pois...
How severe is CVE-2020-15810?
CVE-2020-15810 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-15810?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap.