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CVE-2018-12387

9.1 · CRITICAL

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout.

Published Oct 18, 2018CWE-20EPSS 9.59%

Overview

CVE-2018-12387 is a critical-severity vulnerability. It was published on October 18, 2018 and has a CVSS 3.0 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

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/105460Refwww.securitytracker.com/id/1041770Refaccess.redhat.com/errata/RHSA-2018:2881Refaccess.redhat.com/errata/RHSA-2018:2884Refbugzilla.mozilla.org/show_bug.cgi?id=1493903Refsecurity.gentoo.org/glsa/201810-01Refusn.ubuntu.com/3778-1/Refwww.debian.org/security/2018/dsa-4310Refwww.mozilla.org/security/advisories/mfsa2018-24/Refwww.securityfocus.com/bid/105460

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12387?

CVE-2018-12387 is a critical-severity vulnerability. It was published on October 18, 2018 and has a CVSS 3.0 base score of 9.1 (CRITICAL).

How severe is CVE-2018-12387?

This vulnerability has a CVSS 3.0 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-12387?

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-2018-12387?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12387 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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