Debian LTS: DLA-2564-1: php-horde-text-filter security update
Summary
CVE-2021-26929
An XSS issue was discovered in Horde Groupware Webmail Edition
(where the Horde_Text_Filter library is used). The attacker can
send a plain text e-mail message, with JavaScript encoded as a
link or email that is mishandled by preProcess in Text2html.php,
because bespoke use of \x00\x00\x00 and \x01\x01\x01 interferes
with XSS defenses.
For Debian 9 stretch, this problem has been fixed in version
2.3.5-1+deb9u1.
We recommend that you upgrade your php-horde-text-filter packages.
For the detailed security status of php-horde-text-filter please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/php-horde-text-filter
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS