Created attachment 490029 [details] updated patch from Debian (tmux_1.4-6) A Debian bug report [1] 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. To reproduce: % SHELL="/bin/dash" tmux -S my_socket $ id 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). [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=620304
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]