Date: Thu, 11 Jul 2002 04:20:04 -0700 (PDT) From: "Artem 'Zazoobr' Ignatjev" <timon@netherworld.ru> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/39951: Sendmail 8.12.3 and `msgs' alias Message-ID: <200207111120.g6BBK4SQ090918@freefall.freebsd.org>
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The following reply was made to PR misc/39951; it has been noted by GNATS.
From: "Artem 'Zazoobr' Ignatjev" <timon@netherworld.ru>
To: freebsd-bugs@FreeBSD.org, FreeBSD-gnats-submit@FreeBSD.org
Cc:
Subject: Re: misc/39951: Sendmail 8.12.3 and `msgs' alias
Date: Thu, 11 Jul 2002 15:09:02 +0400 (MSD)
On Fri, Jun 28, 2002 at 05:20:01AM -0700, FreeBSD-gnats-submit@FreeBSD.org wrote:
> Thank you very much for your problem report.
> It has the internal identification `misc/39951'.
> The individual assigned to look at your
> report is: freebsd-bugs.
>
> >Category: misc
> >Responsible: freebsd-bugs
> >Synopsis: Sendmail 8.12.3 and `msgs' alias
> >Arrival-Date: Fri Jun 28 05:20:01 PDT 2002
More digging lead me to following hack (msgs will now be suid, so if it
can be exploited, that'll be one more hole):
I've also noted, that first time BINMODE was set incorrect ( 4755 instead of 4555)
---- Begin patch ----
diff -U 3 -r usr.bin/msgs/Makefile usr.bin/msgs/Makefile
--- usr.bin/msgs/Makefile Wed Jul 10 20:44:12 2002
+++ usr.bin/msgs/Makefile Wed Jul 10 20:41:08 2002
@@ -4,5 +4,6 @@
PROG= msgs
DPADD= ${LIBTERMCAP}
LDADD= -ltermcap
+BINMODE= 4555
.include <bsd.prog.mk>
diff -U 3 -r usr.bin/msgs/msgs.c usr.bin/msgs/msgs.c
--- usr.bin/msgs/msgs.c Wed Jul 10 20:40:12 2002
+++ usr.bin/msgs/msgs.c Wed Jul 10 20:41:21 2002
@@ -179,7 +179,7 @@
setlocale(LC_ALL, "");
time(&t);
- setuid(uid = getuid());
+ setuid(uid = geteuid());
ruptible = (signal(SIGINT, SIG_IGN) == SIG_DFL);
if (ruptible)
signal(SIGINT, SIG_DFL);
---- End patch ----
Directions: apply this standing in source tree root (shake well before
using :-) )
Sinceherely yours, Artem 'Zazoobr' Ignatjev.
--- Unix is like a wigwam: No windows, no gates and an apache inside.
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