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CVE-2019-3556

8.1 · HIGH

HHVM supports the use of an "admin" server which accepts administrative requests over HTTP.

Published Oct 26, 2021CWE-22EPSS 1.79%

Overview

CVE-2019-3556 is a high-severity vulnerability. It was published on October 26, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.

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

GitHubgithub.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4Refhhvm.com/blog/2020/11/12/security-update.htmlRefwww.facebook.com/security/advisories/cve-2019-3556GitHubgithub.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4Refhhvm.com/blog/2020/11/12/security-update.htmlRefwww.facebook.com/security/advisories/cve-2019-3556

How CyberStrike helps

Frequently asked questions

What is CVE-2019-3556?

CVE-2019-3556 is a high-severity vulnerability. It was published on October 26, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2019-3556?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-3556?

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-2019-3556?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-3556 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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