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Debian 10: DLA-3547-1 Critical: Nextcloud Core Security Flaw

debian lts
Calendar Grey February 19, 2021
Dist Debian Esm H88
Identified XSS vulnerability within Horde Framework impacting email accounts, Debian suggests upgrading php-horde-text-filter packages.
Alex Birnberg discovered a cross-site scripting (XSS) vulnerability in the Horde Application Framework, more precisely its Text Filter API
Topics%20covered

Topics Covered

security advisory moderate update software update debian xss xss issue text filter php-horde php-horde-text-filter mailbox control

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


Severity
critical
Lowest
Low
Medium
High
Critical

Package: php-horde-text-filter
Version: 2.3.5-1+deb9u1
CVE ID: CVE-2021-26929
Debian Bug: 982769

Topics%20covered

Topics Covered

security advisory moderate update software update debian xss xss issue text filter php-horde php-horde-text-filter mailbox control

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