Buffer overflow in Squid - CVE-2020-8517

Vulnerability identifier: #VU25020

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-8517

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a boundary error in the NTLM authentication credentials parser in ext_lm_group_acl. A remote attacker can send a specially crafted HTTP request to the affected proxy server, trigger memory corruption and perform a denial of service attack.

Squid
Amazon Linux AMI
Gentoo Linux
Opensuse
openEuler
squid (Alpine package)
squid3 (Ubuntu package)
squid (Ubuntu package)
squid
squid-debuginfo
squid-debugsource

Install updates from vendor's website.

Squid - update to 4.10
squid (Alpine package) - update to 3.5.27-r4
squid3 (Ubuntu package) - addressed in versions 3.5.12-1ubuntu7.10, 3.5.27-1ubuntu1.5
squid (Ubuntu package) - update to 4.8-1ubuntu2.2
squid - update to 3.5.20-17.48
squid - update to 4.9-2
squid-debuginfo - update to 4.9-2
squid-debugsource - update to 4.9-2

• http://www.squid-cache.org/Advisories/SQUID-2020_3.txt

• Multiple vulnerabilities in Squid Proxy Cache
• Ubuntu update for Squid
• OpenSUSE Linux update for squid
• Gentoo update for Squid
• OpenSUSE Linux update for squid
• OpenSUSE Linux update for squid
• Buffer overflow in squid (Alpine package)
• Amazon Linux AMI update for squid
• openEuler 20.03 LTS update for squid