Debian Long Term Support / LTS Security Information / 2021 / Security Information -- DLA-2564-1 php-horde-text-filter

Debian Security Advisory

DLA-2564-1 php-horde-text-filter -- LTS security update

Date Reported:

18 Feb 2021

Affected Packages:

php-horde-text-filter

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 982769.
In Mitre's CVE dictionary: CVE-2021-26929.

More information:

Alex Birnberg discovered a cross-site scripting (XSS) vulnerability in the Horde Application Framework, more precisely its Text Filter API. An attacker could take control of a user's mailbox by sending a crafted e-mail.

• 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/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