CVE-2023-50262

NameCVE-2023-50262
DescriptionDompdf is an HTML to PDF converter for PHP. When parsing SVG images Dompdf performs an initial validation to ensure that paths within the SVG are allowed. One of the validations is that the SVG document does not reference itself. However, prior to version 2.0.4, a recursive chained using two or more SVG documents is not correctly validated. Depending on the system configuration and attack pattern this could exhaust the memory available to the executing process and/or to the server itself. php-svg-lib, when run in isolation, does not support SVG references for `image` elements. However, when used in combination with Dompdf, php-svg-lib will process SVG images referenced by an `image` element. Dompdf currently includes validation to prevent self-referential `image` references, but a chained reference is not checked. A malicious actor may thus trigger infinite recursion by chaining references between two or more SVG images. When Dompdf parses a malicious payload, it will crash due after exceeding the allowed execution time or memory usage. An attacker sending multiple request to a system can potentially cause resource exhaustion to the point that the system is unable to handle incoming request. Version 2.0.4 contains a fix for this issue.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1058793

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
php-dompdf (PTS)buster0.6.2+dfsg-3fixed
buster (security)0.6.2+dfsg-3+deb10u2fixed
bullseye0.6.2+dfsg-3.1vulnerable
bookworm2.0.3+dfsg-1vulnerable
sid, trixie2.0.7+dfsg-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
php-dompdfsourcebuster(not affected)
php-dompdfsource(unstable)2.0.4+dfsg-11058793

Notes

[bookworm] - php-dompdf <no-dsa> (Minor issue)
[bullseye] - php-dompdf <no-dsa> (Minor issue)
[buster] - php-dompdf <not-affected> (SVG images are rejected by default)
https://github.com/dompdf/dompdf/security/advisories/GHSA-3qx2-6f78-w2j2
https://github.com/dompdf/dompdf/commit/41cbac16f3cf56affa49f06e8dae66d0eac2b593 (v2.0.4)
check sources embedding php-dompdf if affected

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