Inconsistent interpretation of HTTP requests in Squid - CVE-2020-15049

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Main Vulnerability Database Vulnerabilities #VU29391

Inconsistent interpretation of HTTP requests in Squid - CVE-2020-15049

Published: June 30, 2020


Vulnerability identifier: #VU29391
CSH Severity: Medium
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2020-15049
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform cache poisoning attack.

The vulnerability exists in the way Squid processes client's requests. A remote client can send specially crafted data in the request to perform request smuggling and poison the HTTP cache contents with crafted HTTP(S) request messages.

Successful exploitation of the vulnerability requires an upstream server to participate in the smuggling and generate the poison response sequence.


Affected software

Squid
Amazon Linux AMI
Debian Linux
Anolis OS
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Opensuse
Ubuntu
openEuler
Fedora
libecap-devel
libecap
squid (Ubuntu package)
squid-sysvinit
squid-migration-script
squid
squid (Red Hat package)
squid (Debian package)
squid-debuginfo
squid-debugsource

How to mitigate CVE-2020-15049

Install updates from vendor's website.

Squid - addressed in versions 4.12, 5.0.3
libecap-devel - update to 1.0.1-2
libecap - update to 1.0.1-2
squid (Ubuntu package) - addressed in versions 3.5.12-1ubuntu7.15, 3.5.12-1ubuntu7.16, 3.5.27-1ubuntu1.9, 3.5.27-1ubuntu1.10, 4.10-1ubuntu1.3, 4.13-1ubuntu2.1
squid-sysvinit - update to 3.5.20-17
squid-migration-script - update to 3.5.20-17
squid - addressed in versions 3.5.20-17, 4.11-4
squid (Red Hat package) - update to 3.5.20-17.el7_9.4
squid (Debian package) - update to 4.6-1+deb10u3
squid-debuginfo - update to 4.9-5
squid-debugsource - update to 4.9-5
squid - update to 4.9-5
squid - update to 4.12-1.fc31

External References

Related Security Bulletins