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CVE-2021-3838— PHAR Deserialization in dompdf/dompdf

Quick assessment

Affected
dompdf dompdf/dompdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Dompdf是一个 HTML 到 PDF 的转换器。 Dompdf 存在安全漏洞，该漏洞源于容易受到使用反序列化不受信任数据的影响。

AI Predicted 9.1 Difficulty: Moderate EPSS 1.43% · P72

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-3838

Vulnerability Information
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Vulnerability Title
PHAR Deserialization in dompdf/dompdf
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Dompdf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dompdf是一个 HTML 到 PDF 的转换器。 Dompdf 存在安全漏洞，该漏洞源于容易受到使用反序列化不受信任数据的影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dompdf dompdf/dompdf unspecified ~ 2.0.0 -

II. Public POCs for CVE-2021-3838

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III. Intelligence Information for CVE-2021-3838

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Patches & Fixes for CVE-2021-3838 (1)

Vendor Advisories for CVE-2021-3838 (1)

IV. Related Vulnerabilities

Same product: dompdf/dompdf
Same vendor: dompdf
Same weakness: CWE-502

V. Comments for CVE-2021-3838

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