Dompdf up to 2.0.2 SVG File interpretation conflict

Summaryinfo

A vulnerability described as critical has been identified in Dompdf up to 2.0.2. The affected element is an unknown function of the component SVG File Handler. Such manipulation leads to interpretation conflict. This vulnerability is listed as CVE-2023-24813. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Dompdf up to 2.0.2. Affected by this issue is an unknown code block of the component SVG File Handler. The manipulation with an unknown input leads to a interpretation conflict vulnerability. Using CWE to declare the problem leads to CWE-436. Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented 02/07/2023 as GHSA-56gj-mvh6-rp75. The advisory is available at github.com. This vulnerability is handled as CVE-2023-24813 since 01/30/2023. The technical details are unknown and an exploit is not available.

Upgrading to version 2.0.3 eliminates this vulnerability. Applying the patch 95009ea98230f9b084b040c34e3869ef3dccc9aa is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Dompdf

Version

• 2.0.0
• 2.0.1
• 2.0.2

License

• open-source

Website

• Product: https://github.com/dompdf/dompdf/

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CPE 2.2info

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