Reachable Assertion in Squid - CVE-2021-46784

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Main Vulnerability Database Vulnerabilities #VU64484

Reachable Assertion in Squid - CVE-2021-46784

Published: June 18, 2022 / Updated: July 20, 2022


Vulnerability identifier: #VU64484
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-46784
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a reachable assertion when processing Gopher server responses. A remote attacker can send a specially crafted response to the proxy server and perform a denial of service (DoS) attack.


Affected software

Squid
Amazon Linux AMI
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Enterprise Storage
Red Hat Enterprise Linux for Power, big endian
Anolis OS
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
CentOS
SUSE Linux Enterprise Storage
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Oracle Linux
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
Oracle Solaris
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Module for Server Applications
openSUSE Leap
Ubuntu
openEuler
Fedora
Red Hat OpenShift Container Platform
squid (Debian package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
libecap
libecap-devel
squid-sysvinit
squid
squid-migration-script
squid (Red Hat package)
squid-debuginfo
squid-debugsource
squid (Ubuntu package)

How to mitigate CVE-2021-46784

Install updates from vendor's website.

Squid - update to 5.6
Red Hat OpenShift Container Platform - update to 3.11.784
squid (Debian package) - addressed in versions 4.6-1+deb10u7, 4.13-10+deb11u1
libecap - update to 1.0.1-2.0.1
libecap-devel - update to 1.0.1-2.0.1
squid-sysvinit - update to 3.5.20-17
squid - addressed in versions 3.5.20-17, 4.15-3
squid-migration-script - update to 3.5.20-17
squid (Red Hat package) - addressed in versions 3.5.20-17.el7_9.7, 5.2-1.el9_0.1
squid - update to 3.5.20-17.43
squid - addressed in versions 3.5.21-26.35.1, 4.17-4.24.1, 4.17-150000.5.32.1, 5.6-150400.3.3.1
squid-debuginfo - addressed in versions 3.5.21-26.35.1, 4.17-4.24.1, 4.17-150000.5.32.1, 5.6-150400.3.3.1
squid-debugsource - addressed in versions 3.5.21-26.35.1, 4.17-4.24.1, 4.17-150000.5.32.1, 5.6-150400.3.3.1
squid (Ubuntu package) - addressed in versions 3.5.27-1ubuntu1.13, 4.10-1ubuntu1.6, 4.13-10ubuntu5.1, 5.2-1ubuntu4.1
squid-debugsource - update to 4.9-11
squid-debuginfo - update to 4.9-11
squid - update to 4.9-11
squid - addressed in versions 5.6-1.fc35, 5.6-1.fc36

External References

Related Security Bulletins