CVE-2021-3902

Name	CVE-2021-3902
Description	An improper restriction of external entities (XXE) vulnerability in dompdf/dompdf's SVG parser allows for Server-Side Request Forgery (SSRF) and deserialization attacks. This issue affects all versions prior to 2.0.0. The vulnerability can be exploited even if the isRemoteEnabled option is set to false. It allows attackers to perform SSRF, disclose internal image files, and cause PHAR deserialization attacks.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

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	fixed
	bookworm	2.0.3+dfsg-1	fixed
	sid	3.1.0+dfsg-1	fixed

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

Package	Type	Release	Fixed Version
php-dompdf	source	buster	(not affected)
php-dompdf	source	bullseye	(not affected)
php-dompdf	source	(unstable)	2.0.2+dfsg-1

Notes

[bullseye] - php-dompdf <not-affected> (current code reject svg image. Double checked by testing)
[buster] - php-dompdf <not-affected> (current code reject svg image. Double checked by testing)
https://github.com/dompdf/dompdf/issues/2564
https://huntr.dev/bounties/a6071c07-806f-429a-8656-a4742e4191b1
https://github.com/dompdf/dompdf/commit/f56bc8e40be6c0ae0825e6c7396f4db80620b799 (v2.0.0)