Cross-site request forgery in Squid - CVE-2019-18677

Vulnerability identifier: #VU22910

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-2019-18677

CWE-ID: CWE-352

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin, when Squid is configured with the append_domain option. A remote attacker can trick the victim to visit a specially crafted web page and redirect victim's traffic to a third-party domain.

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

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_9.txt

• Multiple vulnerabilities in Squid proxy server
• OpenSUSE Linux update for squid
• OpenSUSE Linux update for squid
• Ubuntu 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