CVEvulnerability

CVE-2020-15810

6.5 MEDIUM Published 2020-09-02 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-09-02
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 ([email protected])
3.5 LOW — AV:N/AC:M/Au:S/C:N/I:P/A:N
Weaknesses
CWE-444

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.

Affected configurations

• squid-cache squid (< 4.13) • squid-cache squid (>= 5.0 < 5.0.4) • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • canonical ubuntu linux 20.04 • debian debian linux 9.0 • debian debian linux 10.0 • fedoraproject fedora 31 • fedoraproject fedora 32 • fedoraproject fedora 33 • opensuse leap 15.1 • opensuse leap 15.2

Related

Weakness · CWE (1)

  • CWE-444 Inconsistent Interpretation of HTTP Requests weakness

References