CVE-2021-3838
DomPDF PHAR Deserialization Remote Code Execution
Description
DomPDF before version 2.0.0 is vulnerable to PHAR 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.
INFO
Published Date :
Nov. 15, 2024, 11:15 a.m.
Last Modified :
Nov. 19, 2024, 5:11 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.0 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
CVE-2021-3838 vulnerability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-3838.
| URL | Resource |
|---|---|
| https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a | Patch |
| https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e | Exploit Issue Tracking Patch Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3838 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-3838
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3838 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3838 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Nov. 19, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a No Types Assigned https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a Patch Changed Reference Type https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e No Types Assigned https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e Exploit, Issue Tracking, Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:dompdf_project:dompdf:*:*:*:*:*:*:*:* versions up to (excluding) 2.0.0 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 18, 2024
Action Type Old Value New Value Added CVSS V3.1 CISA-ADP AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
CVE Received by [email protected]
Nov. 15, 2024
Action Type Old Value New Value Added Description DomPDF before version 2.0.0 is vulnerable to PHAR 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. Added Reference huntr.dev https://huntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e [No types assigned] Added Reference huntr.dev https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a [No types assigned] Added CWE huntr.dev CWE-502 Added CVSS V3 huntr.dev AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H