CVE-2020-15810 Information

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 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html https://github.com/squid-cache/squid/security/advisories/GHSA-3365-q9qx-f98m https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html https://lists.fedoraproject.org/archives/list/[email protected]/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2/ https://lists.fedoraproject.org/archives/list/[email protected]/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3/ https://lists.fedoraproject.org/archives/list/[email protected]/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7/ https://usn.ubuntu.com/4477-1/ https://usn.ubuntu.com/4551-1/ https://www.debian.org/security/2020/dsa-4751

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5