Inconsistent interpretation of HTTP requests in Squid - CVE-2019-18678

Vulnerability identifier: #VU22587

CSH Severity: Medium

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-18678

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to insufficient validation of HTTP request headers in Squid. A remote attacker can initiate a specially crafted HTTP request that will cause the software to split HTTP request and display to the end user content, controlled by the attacker at arbitrary URL.

Squid
Arch Linux
Gentoo Linux
Red Hat Enterprise Linux for Power, little endian
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Opensuse
Fedora
squid (Debian package)
squid3 (Ubuntu package)
squid (Ubuntu package)
libecap
libecap-devel
squid

Install updates from vendor's website.

Squid - update to 4.9
squid (Debian package) - update to 4.6-1+deb10u2
squid3 (Ubuntu package) - addressed in versions 3.5.12-1ubuntu7.9, 3.5.27-1ubuntu1.4
squid (Ubuntu package) - addressed in versions 4.4-1ubuntu2.3, 4.8-1ubuntu2.1
libecap - update to 1.0.1-2
libecap-devel - update to 1.0.1-2
squid - addressed in versions 4.9-2.fc30, 4.9-2.fc31
squid - update to 4.11-4

• http://www.squid-cache.org/Advisories/SQUID-2019_10.txt

• Arch Linux update for squid
• Multiple vulnerabilities in Squid proxy server
• OpenSUSE Linux update for squid
• OpenSUSE Linux update for squid
• Ubuntu update for Squid
• Gentoo update for Squid
• Debian update for squid
• Red Hat Enterprise Linux 8 update for the squid:4 module
• Anolis OS update for squid:4 (Anolis OS 8.4) module
• Fedora 30 update for squid
• Fedora 31 update for squid