Vulnerability in Dompdf
CVE-2023-24813
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.025 (84.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
- Dompdf — versions = 2.0.2
- Dompdf Project — versions 2.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/dompdf/dompdf/security/advisories/GHSA-56gj-mvh6-rp75 (Exploit, Vendor Advisory)
- github.com/dompdf/dompdf/commit/95009ea98230f9b084b040c34e3869ef3dccc9aa (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-24813?
- CVE-2023-24813 is a critical-severity vulnerability in Dompdf, classified under CWE-436. CVSS score: 10.0/10. Published 2023-02-07.
- How severe is CVE-2023-24813?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2023-24813 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.