CVE-2023-24813: URI validation failure on SVG parsing. Bypass of CVE-2023-23924
First published: Tue Feb 07 2023(Updated: )
Dompdf is an HTML to PDF converter written in php. Due to the difference in the attribute parser of Dompdf and php-svg-lib, an attacker can still call arbitrary URLs with arbitrary protocols. Dompdf parses the href attribute of `image` tags and respects `xlink:href` even if `href` is specified. However, php-svg-lib, which is later used to parse the svg file, parses the href attribute. Since `href` is respected if both `xlink:href` and `href` is specified, it's possible to bypass the protection on the Dompdf side by providing an empty `xlink:href` attribute. An attacker can exploit the vulnerability to call arbitrary URLs with arbitrary protocols if they provide an SVG file to the Dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, which will lead, at the very least, to arbitrary file deletion and might lead to remote code execution, depending on available classes. This vulnerability has been addressed in commit `95009ea98` which has been included in release version 2.0.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Dompdf | =2.0.2 |
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Reference Links
Frequently Asked Questions
What is CVE-2023-24813?
CVE-2023-24813 is a critical vulnerability in Dompdf, an HTML to PDF converter written in PHP, that allows an attacker to call arbitrary URLs with arbitrary protocols.
How severe is CVE-2023-24813?
CVE-2023-24813 has a severity score of 9.8 (critical).
Which version of Dompdf is affected by CVE-2023-24813?
Dompdf version 2.0.2 is affected by CVE-2023-24813.
How can an attacker exploit CVE-2023-24813?
An attacker can exploit CVE-2023-24813 by manipulating the href attribute of image tags to call arbitrary URLs with arbitrary protocols.
Are there any references related to CVE-2023-24813?
Yes, you can find more information about CVE-2023-24813 in the following references: - [GitHub Commit](https://github.com/dompdf/dompdf/commit/95009ea98230f9b084b040c34e3869ef3dccc9aa) - [GitHub Security Advisory](https://github.com/dompdf/dompdf/security/advisories/GHSA-56gj-mvh6-rp75)
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