CVE-2023-23924 URI validation failure on SVG parsing in Dompdf

2023-01-3123:54:30

CWE-551

GitHub_M

www.cve.org

dompdf

svg parsing

uri validation

php < 8

phar url wrapper

arbitrary object unserialize

arbitrary file deletion

remote code execution

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:H

AI Score

9.7

Confidence

High

EPSS

0.011

Percentile

84.6%

JSON

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.

CNA Affected

[
  {
    "vendor": "dompdf",
    "product": "dompdf",
    "versions": [
      {
        "version": "< 2.0.2",
        "status": "affected"
      }
    ]
  }
]