Inconsistent interpretation of HTTP requests in Squid - CVE-2020-15810

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Main Vulnerability Database Vulnerabilities #VU46117

Inconsistent interpretation of HTTP requests in Squid - CVE-2020-15810

Published: August 28, 2020


Vulnerability identifier: #VU46117
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-2020-15810
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote authenticated attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.


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-2020-15810

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