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CVE-2023-45139

7.5 · HIGH

fontTools is a library for manipulating fonts, written in Python.

Published Jan 10, 2024CWE-611EPSS 1.23%

Overview

CVE-2023-45139 is a high-severity vulnerability. It was published on January 10, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

fontTools is a library for manipulating fonts, written in Python. The subsetting module has a XML External Entity Injection (XXE) vulnerability which allows an attacker to resolve arbitrary entities when a candidate font (OT-SVG fonts), which contains a SVG table, is parsed. This allows attackers to include arbitrary files from the filesystem fontTools is running on or make web requests from the host system. This vulnerability has been patched in version 4.43.0.

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

Refwww.openwall.com/lists/oss-security/2024/03/08/2Refwww.openwall.com/lists/oss-security/2024/03/09/1GitHubgithub.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4cGitHubgithub.com/fonttools/fonttools/releases/tag/4.43.0GitHubgithub.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5Reflists.fedoraproject.org/archives/list/[email protected]/message/VY63B4SGY4QOQGUXMECRGD6K3YT3GJ75/Refwww.openwall.com/lists/oss-security/2024/03/08/2Refwww.openwall.com/lists/oss-security/2024/03/09/1GitHubgithub.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4cGitHubgithub.com/fonttools/fonttools/releases/tag/4.43.0

How CyberStrike helps

Frequently asked questions

What is CVE-2023-45139?

CVE-2023-45139 is a high-severity vulnerability. It was published on January 10, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-45139?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-45139?

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-2023-45139?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-45139 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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