The File Manager (gollem) module in Horde Groupware has allowed remote attackers to bypass Horde authentication for file downloads via a crafted fn parameter that corresponded to the exact filename.

For Debian 9 stretch, this problem has been fixed in version 3.0.10-1+deb9u2.

We recommend that you upgrade your php-horde-gollem packages.

For the detailed security status of php-horde-gollem please refer to its security tracker page at: https://security-tracker.debian.org/tracker/php-horde-gollem

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