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CVE-2018-12402

6.5 · MEDIUM

The internal WebBrowserPersist code does not use correct origin context for a resource being saved.

Published Feb 28, 2019CWE-346EPSS 1.32%

Overview

CVE-2018-12402 is a medium-severity vulnerability. It was published on February 28, 2019 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The internal WebBrowserPersist code does not use correct origin context for a resource being saved. This manifests when sub-resources are loaded as part of "Save Page As..." functionality. For example, a malicious page could recover a visitor's Windows username and NTLM hash by including resources otherwise unreachable to the malicious page, if they can convince the visitor to save the complete web page. Similarly, SameSite cookies are sent on cross-origin requests when the "Save Page As..." menu item is selected to save a page, which can result in saving the wrong version of resources based on those cookies. This vulnerability affects Firefox < 63.

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

Refwww.securityfocus.com/bid/105721Refwww.securitytracker.com/id/1041944Refbugzilla.mozilla.org/show_bug.cgi?id=1447087Refbugzilla.mozilla.org/show_bug.cgi?id=1469916Refusn.ubuntu.com/3801-1/Refwww.mozilla.org/security/advisories/mfsa2018-26/Refwww.securityfocus.com/bid/105721Refwww.securitytracker.com/id/1041944Refbugzilla.mozilla.org/show_bug.cgi?id=1447087Refbugzilla.mozilla.org/show_bug.cgi?id=1469916

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12402?

CVE-2018-12402 is a medium-severity vulnerability. It was published on February 28, 2019 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

How severe is CVE-2018-12402?

This vulnerability has a CVSS 3.0 base score of 6.5, 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-2018-12402?

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-2018-12402?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12402 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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