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CVE-2018-18509

5.3 · MEDIUM

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signat…

Published Apr 26, 2019CWE-347EPSS 1.68%

Overview

CVE-2018-18509 is a medium-severity vulnerability. It was published on April 26, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

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/2019-04/msg00043.htmlRefpacketstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlRefseclists.org/fulldisclosure/2019/Apr/38Refwww.openwall.com/lists/oss-security/2019/04/30/4Refaccess.redhat.com/errata/RHSA-2019:1144Refbugzilla.mozilla.org/show_bug.cgi?id=1507218GitHubgithub.com/RUB-NDS/Johnny-You-Are-FiredGitHubgithub.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdfRefwww.mozilla.org/security/advisories/mfsa2019-06/Reflists.opensuse.org/opensuse-security-announce/2019-04/msg00043.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-18509?

CVE-2018-18509 is a medium-severity vulnerability. It was published on April 26, 2019 and has a CVSS 3.0 base score of 5.3 (MEDIUM).

How severe is CVE-2018-18509?

This vulnerability has a CVSS 3.0 base score of 5.3, 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-2018-18509?

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-2018-18509?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-18509 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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