CVE-2023-45139

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.

Weakness

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected Software

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/221.html

References

• http://www.openwall.com/lists/oss-security/2024/03/08/2
• http://www.openwall.com/lists/oss-security/2024/03/09/1
• https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c
• https://github.com/fonttools/fonttools/releases/tag/4.43.0
• https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VY63B4SGY4QOQGUXMECRGD6K3YT3GJ75/
• http://www.openwall.com/lists/oss-security/2024/03/08/2
• http://www.openwall.com/lists/oss-security/2024/03/09/1
• https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c
• https://github.com/fonttools/fonttools/releases/tag/4.43.0
• https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VY63B4SGY4QOQGUXMECRGD6K3YT3GJ75/