CVE-2020-5226

Name	CVE-2020-5226
Description	Cross-site scripting in SimpleSAMLphp before version 1.18.4. The www/erroreport.php script allows error reports to be submitted and sent to the system administrator. Starting with SimpleSAMLphp 1.18.0, a new SimpleSAML\Utils\EMail class was introduced to handle sending emails, implemented as a wrapper of an external dependency. This new wrapper allows us to use Twig templates in order to create the email sent with an error report. Since Twig provides automatic escaping of variables, manual escaping of the free-text field in www/errorreport.php was removed to avoid double escaping. However, for those not using the new user interface yet, an email template is hardcoded into the class itself in plain PHP. Since no escaping is provided in this template, it is then possible to inject HTML inside the template by manually crafting the contents of the free-text field.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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
simplesamlphp (PTS)	jessie, jessie (lts)	1.13.1-2+deb8u3	fixed
	stretch (security), stretch (lts), stretch	1.14.11-1+deb9u2	fixed
	buster	1.16.3-1+deb10u2	fixed
	buster (security)	1.16.3-1+deb10u1	fixed
	bullseye	1.19.0-1	fixed
	sid, trixie, bookworm	1.19.7-1	fixed

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

Package	Type	Release	Fixed Version	Urgency
simplesamlphp	source	wheezy	(unfixed)	end-of-life
simplesamlphp	source	jessie	(not affected)
simplesamlphp	source	stretch	(not affected)
simplesamlphp	source	buster	(not affected)
simplesamlphp	source	(unstable)	1.18.4-1

Notes

[buster] - simplesamlphp <not-affected> (Vulnerable code introduced later)
[stretch] - simplesamlphp <not-affected> (Vulnerable code introduced later)
[jessie] - simplesamlphp <not-affected> (Vulnerable code introduced later)
https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-mj9p-v2r8-wf8w
https://simplesamlphp.org/security/202001-01