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CVE-2018-18506

5.9 · MEDIUM

When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are t…

Published Feb 5, 2019EPSS 2.20%

Overview

CVE-2018-18506 is a medium-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-03/msg00035.htmlReflists.opensuse.org/opensuse-security-announce/2019-03/msg00043.htmlReflists.opensuse.org/opensuse-security-announce/2019-04/msg00023.htmlReflists.opensuse.org/opensuse-security-announce/2019-04/msg00043.htmlRefwww.securityfocus.com/bid/106773Refaccess.redhat.com/errata/RHSA-2019:0622Refaccess.redhat.com/errata/RHSA-2019:0623Refaccess.redhat.com/errata/RHSA-2019:0680Refaccess.redhat.com/errata/RHSA-2019:0681Refaccess.redhat.com/errata/RHSA-2019:0966

How CyberStrike helps

Frequently asked questions

What is CVE-2018-18506?

CVE-2018-18506 is a medium-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2018-18506?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-18506?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-18506?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-18506 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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