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CVE-2019-16216

5.4 · MEDIUM

Zulip server before 2.0.5 incompletely validated the MIME types of uploaded files.

Published Sep 18, 2019CWE-79EPSS 0.68%

Overview

CVE-2019-16216 is a medium-severity vulnerability. It was published on September 18, 2019 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Zulip server before 2.0.5 incompletely validated the MIME types of uploaded files. A user who is logged into the server could upload files of certain types to mount a stored cross-site scripting attack on other logged-in users. On a Zulip server using the default local uploads backend, the attack is only effective against browsers lacking support for Content-Security-Policy such as Internet Explorer 11. On a Zulip server using the S3 uploads backend, the attack is confined to the origin of the configured S3 uploads hostname and cannot reach the Zulip server itself.

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

Refblog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/GitHubgithub.com/zulip/zulip/commit/1195841dfb9aa26b3b0dabc6f05d72e4af25be3eRefblog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/GitHubgithub.com/zulip/zulip/commit/1195841dfb9aa26b3b0dabc6f05d72e4af25be3e

How CyberStrike helps

Frequently asked questions

What is CVE-2019-16216?

CVE-2019-16216 is a medium-severity vulnerability. It was published on September 18, 2019 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2019-16216?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-16216?

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-2019-16216?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-16216 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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