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ThinLinc 4.13.0 Release Notes

Introduction

Cendio are proud to present ThinLinc 4.13.0, with more than 120 enhancements and fixes. The most prominent changes are:

  • The ThinLinc server has been updated to use Python 3 and GTK+ 3 in order to be more compatible with the latest distributions and with future distributions. Distributions where Python 3 is not available are no longer supported by this or future versions of ThinLinc.
  • ThinLinc 4.12.0 unfortunately introduced a security regression where malicious users on a ThinLinc agent could cause other user's sessions to freeze and lock up. This regression has been fixed in this version of ThinLinc and all users currently using ThinLinc 4.12.0 or later are recommended to upgrade as soon as is possible.
  • Some stability issues with Kerberos on Windows have been fixed and the ThinLinc client should now work reliably with Kerberos on all platforms.

ThinLinc works on most modern Linux distributions and is supported on any platform that fulfills our documented requirements.

Changes in This Release

In the list below, the bug number is given in parentheses. For more information, visit https://www.cendio.com/bugzilla/.

Server

  • The ThinLinc server now requires Python 3.4 or newer instead of Python 2.6. (4586)
  • The ThinLinc server now requires PyGObject and GTK+ 3.20 or newer instead of PyGTK 2.16.0. (7508)
  • Fixed an issue in ThinLinc 4.12.0 and later where other local users could cause a user's session to freeze by sending invalid data on the session's VNC port. (7706)
  • Fixed an issue in ThinLinc 4.12.0 and later where trying to paste the clipboard to replace selected text would sometimes fail. (7712)
  • Fixed an issue where the master or agent could crash and shut down if the system was under excessive load. (7689)
  • The command tl-passwd is no longer included with ThinLinc. (7696)
  • Fixed an issue where it was not possible to install ThinLinc or to run ThinLinc Setup on an apt system where python-apt wasn't available, such as on Ubuntu 20.10. (7671)
  • Fixed an issue where ThinLinc Setup could log many lines with "Unknown transaction item" when used on a system with DNF. (7714)
  • Fixed an issue where ThinLinc Setup would incorrectly detect support for NFS even when it was not supported by the system. (7718)
  • ThinLinc Setup on apt systems will now install the default MTA. Previously it would install a random package out of the ones providing /usr/sbin/sendmail. (7716)
  • Fixed an issue where the ThinLinc Setup firewall configuration would fail on systems using the lokkit firewall configuration tool. (7722)
  • Fixed an issue where the tl-collect-licensestats cron job would complain about python-thinlinc being missing if ThinLinc Setup had not been run. (5379)
  • Require ThinLinc's configuration files to always use UTF-8. This fixes a bug where ThinLinc allowed configuration files in all types of encodings, despite only being able to handle UTF-8 properly. This is a hard requirement, meaning that if any of the configuration files are not in UTF-8, ThinLinc will not work. (7557)

Native Client

  • Diffie-hellman-group14-sha1 is no longer supported in ssh key exchange. (7524)
  • Fixed an issue in ThinLinc 4.12.1 and later where Kerberos authentication on Windows could fail with "Couldn't setup secure tunnel to Thinlinc server". (7650)
  • Fixed an issue in the ThinLinc client where sessions connected from Windows using Kerberos authentication could get disconnected after a while of use. (7650)
  • The client will now automatically recognize the server SSH host keys on a non-standard port, if the server's SSH host keys are already known to the client for the standard port 22. (7618)
  • Fixed an issue where SSH host certificates were not properly handled and the client would ask the user to verify the host key on every connection. (7643)
  • Logging of simultaneously run clients is now supported, up to a maximum of nine clients. (7640)

Printing Support

  • Fixed an issue where the Printer Access Control feature didn't work on SELinux systems. (7581)
  • The Printer Access Control feature will no longer incorrectly add non existant or removed printers. (5930)

Administration

  • Fixed an issue where text would in some cases be displayed incorrectly in ThinLinc web administration interface. (7567)
  • The status of the ThinLinc Web Access service is now visible in the System Health page of the Web Administration interface. (5125)
  • The tool tl-config now notifies the user if setting a parameter causes that parameter to be created. (2522)

Corrected Issues

ThinLinc has also been enhanced in many other ways. The complete list of corrected issues is:

2522, 2552, 4245, 4279, 4378, 4562, 4586, 4607, 4613, 4614, 4697,
4860, 4877, 4942, 4963, 5014, 5053, 5125, 5370, 5379, 5459, 5702,
5930, 5980, 5985, 6110, 6117, 6154, 6351, 7136, 7330, 7486, 7508,
7521, 7524, 7529, 7530, 7534, 7543, 7544, 7545, 7546, 7547, 7551,
7552, 7553, 7554, 7556, 7557, 7558, 7560, 7562, 7564, 7566, 7567,
7571, 7572, 7573, 7574, 7581, 7583, 7584, 7587, 7595, 7597, 7601,
7602, 7609, 7610, 7613, 7618, 7619, 7622, 7629, 7630, 7640, 7643,
7645, 7649, 7650, 7654, 7658, 7660, 7661, 7663, 7664, 7666, 7669,
7671, 7674, 7676, 7678, 7688, 7689, 7691, 7692, 7694, 7695, 7696,
7699, 7702, 7703, 7706, 7707, 7708, 7709, 7710, 7712, 7713, 7714,
7716, 7717, 7718, 7720, 7722, 7724, 7725, 7726, 7727, 7729, 7730,
7732, 7733, 7735, 7736, 7744
Linux is a registered trademark of Linus Torvalds.
ThinLinc is a registered trademark of Cendio AB.
Ubuntu is a registered trademark of Canonical Ltd.
Windows is a registered trademark of Microsoft, Inc.

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