CVE-2023-23924
The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can exploit the vulnerability to call arbitrary URL with arbitrary protocols, if they can provide a SVG file to dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, that will lead to the very least to an arbitrary file deletion and even remote code execution, depending on classes that are available.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.57% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-551, CWE-863
- Affected
- dompdf project/dompdf
- Source
- security-advisories@github.com
References
- https://github.com/dompdf/dompdf/commit/7558f07f693b2ac3266089f21051e6b78c6a0c85Patch, Third Party Advisory
- https://github.com/dompdf/dompdf/releases/tag/v2.0.2Release Notes, Third Party Advisory
- https://github.com/dompdf/dompdf/security/advisories/GHSA-3cw5-7cxw-v5qgExploit, Third Party Advisory
- https://github.com/dompdf/dompdf/commit/7558f07f693b2ac3266089f21051e6b78c6a0c85Patch, Third Party Advisory
- https://github.com/dompdf/dompdf/releases/tag/v2.0.2Release Notes, Third Party Advisory
- https://github.com/dompdf/dompdf/security/advisories/GHSA-3cw5-7cxw-v5qgExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.