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

    Date 19 Feb 2021
    198
    Posted By LinuxSecurity Advisories
    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.
    
    - -----------------------------------------------------------------------
    Debian LTS Advisory DLA-2564-1              This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/lts/security/                    Sylvain Beucler
    February 18, 2021                           https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------
    
    Package        : php-horde-text-filter
    Version        : 2.3.5-1+deb9u1
    CVE ID         : CVE-2021-26929
    Debian Bug     : 982769
    
    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
    

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