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CVE-2021-3838 — Deserialization of Untrusted Data in dompdf/dompdf...

CRITICAL

Deserialization of Untrusted Data in dompdf/dompdf

Published November 15, 2024Updated November 18, 2024Source: osv

Summary

DomPDF before version 2.0.0 is vulnerable to PHAR (PHP Archive) deserialization due to a lack of checking on the protocol before passing it into the file_get_contents() function. An attacker who can upload files of any type to the server can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when DOMPdf is used with frameworks with documented POP chains like Laravel or vulnerable developer code.

Advisory Timeline

  • First published November 15, 2024 (696 days ago).
  • Last revised November 18, 2024 — 3 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update dompdf/dompdf to 2.0.0 or later
composer require "dompdf/dompdf:^2.0.0"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
dompdf/dompdf
packagist
v0.6.0, v0.6.1, v0.6.2, v0.7.0 (+18 more)2.0.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2021-3838?
Deserialization of Untrusted Data in dompdf/dompdf This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-3838?
CVE-2021-3838 affects dompdf/dompdf. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-3838 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-577p-7j7h-2jgf

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