CVE-2021-3838

Name	CVE-2021-3838
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 (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3495-1, DLA-3495-2

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
php-dompdf (PTS)	bullseye	0.6.2+dfsg-3.1	vulnerable
	bookworm	2.0.3+dfsg-1	fixed
	sid, trixie	3.0.0+dfsg-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
php-dompdf	source	buster	0.6.2+dfsg-3+deb10u2		DLA-3495-2
php-dompdf	source	(unstable)	2.0.2+dfsg-1

Notes

[bullseye] - php-dompdf <no-dsa> (Minor issue)
https://github.com/dompdf/dompdf/issues/2564
https://huntr.dev/bounties/0bdddc12-ff67-4815-ab9f-6011a974f48e
https://github.com/dompdf/dompdf/commit/99aeec1efec9213e87098d42eb09439e7ee0bb6a (v2.0.0)