CVE-2023-50262 Dompdf possible DoS caused by infinite recursion when parsing SVG images

2023-12-1320:52:56

CWE-674

CWE-20

GitHub_M

www.cve.org

dompdf

possible dos

infinite recursion

svg

images

php

validation

memory exhaustion

resource exhaustion

fix

cve-2023-50262

security bug

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

0.0005 Low

EPSS

Percentile

18.1%

JSON

Dompdf is an HTML to PDF converter for PHP. When parsing SVG images Dompdf performs an initial validation to ensure that paths within the SVG are allowed. One of the validations is that the SVG document does not reference itself. However, prior to version 2.0.4, a recursive chained using two or more SVG documents is not correctly validated. Depending on the system configuration and attack pattern this could exhaust the memory available to the executing process and/or to the server itself.

php-svg-lib, when run in isolation, does not support SVG references for image elements. However, when used in combination with Dompdf, php-svg-lib will process SVG images referenced by an image element. Dompdf currently includes validation to prevent self-referential image references, but a chained reference is not checked. A malicious actor may thus trigger infinite recursion by chaining references between two or more SVG images.

When Dompdf parses a malicious payload, it will crash due after exceeding the allowed execution time or memory usage. An attacker sending multiple request to a system can potentially cause resource exhaustion to the point that the system is unable to handle incoming request.

Version 2.0.4 contains a fix for this issue.

CNA Affected

[
  {
    "vendor": "dompdf",
    "product": "dompdf",
    "versions": [
      {
        "version": "< 2.0.4",
        "status": "affected"
      }
    ]
  }
]