Resource management error in Squid - CVE-2021-31807

Vulnerability identifier: #VU53599

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-2021-31807

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: Public exploit is available

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

The vulnerability exists due to improper management of memory within the application when processing HTTP Range header. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

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

Install updates from vendor's website.

Squid - addressed in versions 4.15, 5.0.6
squid (Debian package) - update to 4.6-1+deb10u6
libecap - update to 1.0.1-2.0.1
libecap-devel - update to 1.0.1-2.0.1
squid - update to 3.5.20-17.44
squid (Ubuntu package) - addressed in versions 3.5.27-1ubuntu1.11, 4.10-1ubuntu1.4, 4.13-1ubuntu2.2, 4.13-1ubuntu4.1
squid - addressed in versions 4.15-1.fc33, 5.0.6-1.fc34
squid - update to 4.15-3

• Exploit #6911 - Squid Proxy Range Header DoS (October 21, 2021)

• https://security.gentoo.org/glsa/202105-14
• https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf

• Multiple vulnerabilities in Squid
• Gentoo update for Squid
• Debian update for squid
• Amazon Linux AMI update for squid
• Ubuntu update for squid
• Red Hat Enterprise Linux 8 update for the squid:4 module
• Fedora 33 update for squid
• Fedora 34 update for squid
• Anolis OS update for squid:4 module