CVE-2023-50252

php-svg-lib is an SVG file parsing / rendering library. Prior to version 0.5.1, when handling <use> tag that references an <image> tag, it merges the attributes from the <use> tag to the <image> tag. The problem pops up especially when the href attribute from the <use> tag has not been sanitized. This can lead to an unsafe file read that can cause PHAR Deserialization vulnerability in PHP prior to version 8. Version 0.5.1 contains a patch for this issue.

Weakness

One or more system settings or configuration elements can be externally controlled by a user.

Affected Software

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/13.html
• https://cwe.mitre.org/data/definitions/146.html
• https://cwe.mitre.org/data/definitions/176.html
• https://cwe.mitre.org/data/definitions/203.html
• https://cwe.mitre.org/data/definitions/270.html
• https://cwe.mitre.org/data/definitions/271.html
• https://cwe.mitre.org/data/definitions/579.html
• https://cwe.mitre.org/data/definitions/69.html
• https://cwe.mitre.org/data/definitions/76.html
• https://cwe.mitre.org/data/definitions/77.html

References

• https://github.com/dompdf/php-svg-lib/commit/08ce6a96d63ad7216315fae34a61c886dd2dc030
• https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-jq98-9543-m4cr