Created attachment 490029 [details]
updated patch from Debian (tmux_1.4-6)
A Debian bug report  noted that tmux did not drop group privileges properly. On Debian this is a bit of a security risk as tmux seems to be sgid utmp, but on Fedora it is sgid tmux. In the interest of correcting the behaviour, I'm filing this bug but not as a security bug. This also would affect tmux in EPEL.
% SHELL="/bin/dash" tmux -S my_socket
uid=1001(vdanen) gid=1001(vdanen) egid=482(tmux) groups=1001(vdanen) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
Debian has corrected it with an updated patch (attached).
This has been assigned the CVE name CVE-2011-1496, so we have to treat it as a security flaw now.
Created tmux tracking bugs for this issue
Affects: fedora-all [bug 694563]
Affects: epel-all [bug 694564]