Package : openssh Version : 1:6.7p1-5+deb8u7 Debian Bug : 908652 The security update of OpenSSH announced as DLA 1500-1 introduced a bug in openssh-client: when X11 forwarding is enabled (via system-wide configuration in ssh_config or via -X command line switch), but no DISPLAY is set, the client produces a "DISPLAY "(null)" invalid; disabling X11 forwarding" warning. These bug was introduced by the patch set to fix the CVE-2016-1908 issue. For reference, the following is the relevant section of the original announcement: CVE-2016-1908 OpenSSH mishandled untrusted X11 forwarding when the X server disables the SECURITY extension. Untrusted connections could obtain trusted X11 forwarding privileges. Reported by Thomas Hoger. For Debian 8 "Jessie", this problem has been fixed in version 1:6.7p1-5+deb8u7. We recommend that you upgrade your openssh packages. 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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