HTTP response splitting in Squid - CVE-2020-15811

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU46118

HTTP response splitting in Squid - CVE-2020-15811

Published: August 28, 2020


Vulnerability identifier: #VU46118
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2020-15811
CWE-ID: CWE-113
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences. A remote authenticated attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.


Affected software

Squid
Amazon Linux AMI
Red Hat Enterprise Linux for Power, big endian
Anolis OS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
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
Opensuse
Ubuntu
openEuler
Fedora
squid (Alpine package)
squid (Debian package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
squid (Ubuntu package)
squid
squid-migration-script
squid-sysvinit
squid (Red Hat package)
squid-debugsource
squid-debuginfo

How to mitigate CVE-2020-15811

Install updates from vendor's website.

Squid - addressed in versions 4.13, 5.0.4
squid (Debian package) - update to 4.6-1+deb10u4
squid (Ubuntu package) - addressed in versions 3.5.12-1ubuntu7.15, 3.5.27-1ubuntu1.9, 4.10-1ubuntu1.2
squid - update to 3.5.20-17
squid-migration-script - update to 3.5.20-17
squid-sysvinit - update to 3.5.20-17
squid (Red Hat package) - addressed in versions 3.5.20-17.el7_9.4, 4.4-8.module+el8.2.0+7834+b8ecaeef.2
squid - update to 4.9-5
squid-debugsource - update to 4.9-5
squid-debuginfo - update to 4.9-5
squid - addressed in versions 4.13-1.fc31, 4.13-1.fc32, 4.13-1.fc33

External References

Related Security Bulletins