by Kastro
Paper/Archive/CVE-2021-3838

CVE-2021-3838

dompdf dompdf/dompdf — PHAR Deserialization in dompdf/dompdf

EPSS 1%public exploitCVSS 9.8
critical.is priorityof 100
54
CVSS 9.8 (CNA, ADP, NVD agree)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 73.1.731 × 2014.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
dompdf/dompdfunspecified – < 2.0.02.0.0CNA
dompdf< 2.0.02.0.0CISA-ADP

Scores by source

@huntr_ai (CNA)9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refhuntr.com/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48erefgithub.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a