Input validation error in Squid - CVE-2021-33620

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Main Vulnerability Database Vulnerabilities #VU65362

Input validation error in Squid - CVE-2021-33620

Published: July 15, 2022


Vulnerability identifier: #VU65362
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-33620
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability can be triggered by a header that can be expected to exist in HTTP traffic without any malicious intent by the server. A remote server can trigger the vulnerability and perform a denial of service (DoS) attack.


Affected software

Squid
Amazon Linux AMI
SUSE CaaS Platform
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Enterprise Storage
SUSE Linux Enterprise Storage
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
SUSE Linux Enterprise Server
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Module for Server Applications
openSUSE Leap
Ubuntu
openEuler
Fedora
libecap-devel
libecap
squid
squid (Ubuntu package)
squid-debugsource
squid-debuginfo

How to mitigate CVE-2021-33620

Install update from vendor's website.

Squid - addressed in versions 4.15, 5.0.6
libecap-devel - update to 1.0.1-2.0.1
libecap - 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-debugsource - update to 4.9-8
squid-debuginfo - update to 4.9-8
squid - update to 4.9-8
squid - addressed in versions 4.15-1.fc33, 5.0.6-1.fc34
squid - update to 4.15-3
squid-debugsource - addressed in versions 4.17-4.24.1, 4.17-150000.5.32.1
squid-debuginfo - addressed in versions 4.17-4.24.1, 4.17-150000.5.32.1
squid - addressed in versions 4.17-4.24.1, 4.17-150000.5.32.1

External References

Related Security Bulletins