Thanks for reporting this bug. This appears to be a NULL dereference,
and does not seem exploitable. I have unmarked it security/private.
Please feel free to report other bugs you may find.
$ ps auwwx | grep newgrp
root 23490 0.0 0.0 21900 1064 pts/13 S 14:09 0:00 newgrp testing
$ sudo gdb $(which newgrp) 23490
...
0x00002b81453ebb05 in waitpid () from /lib/libc.so.6
(gdb) cont
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0000000000402903 in ?? ()
(gdb) info reg
rax 0x0 0
...
(gdb) x/5i $pc
0x402903 <[EMAIL PROTECTED]>: mov (%rax),%r9
** Changed in: shadow (Ubuntu)
Importance: Undecided => Low
Status: New => Confirmed
** Visibility changed to: Public
** This bug is no longer flagged as a security issue
--
newgrp segfaults on exit when default group isn't in /etc/groups
https://bugs.launchpad.net/bugs/130205
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