Full Disclosure mailing list archives
Re: usb_modeswitch/pppd -detach
From: srm <srm () suckless org>
Date: Sat, 21 Jan 2012 23:14:27 +0100
On Thu, Jan 19, 2012 at 01:07:02AM +0100, srm wrote:
morrn, Impact ====== Low Summary ======= When using usb_modeswitch and invoking pppd from wvdial in -detach mode. a /tmp/debug file is created. Local Attacker could overwrite arbitrary files. Example ======= ,file /tmp/debug debug: broken symbolic link to `/etc/nologin' Insert stick and connect: ,su Password: ,sh connect >/dev/null ,file debug debug: symbolic link to `/etc/nologin' ,cd /etc && cat nologin symlink-name: /devices/pci0000:00/0000:00:1a.7/usb1/1-3/1-3:1.0/ttyUSB0/tty ,ls -l nologin -rw-r--r-- 1 root root 84 Jan 19 01:11 nologin Software ======== archlinux: community/usb_modeswitch 1.2.1-1c archlinux: core/ppp 2.4.5-3 (base) Please verify. YMMV. Greetings srm
So, the problem is definitive in the community package of archlinux. *sigh*. I checked version 1.2.2 from http://www.draisberghof.de/usb_modeswitch/#download It doesn't contain the '/tmp/debug' statement. However: The following version has the debug statement: https://www.archlinux.org/packages/community/i686/usb_modeswitch/ ,grep -n '/tmp/debug' usb_modeswitch.sh 66: echo "symlink-name: $2" >/tmp/debug A possible quick fix could be to append $$: 66: echo "symlink-name: $2" >/tmp/debug.$$ Greetings srm _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- usb_modeswitch/pppd -detach srm (Jan 19)
- Re: usb_modeswitch/pppd -detach srm (Jan 21)
- Re: usb_modeswitch/pppd -detach Valdis . Kletnieks (Jan 21)
- Re: usb_modeswitch/pppd -detach Larry W. Cashdollar (Jan 23)
- Re: usb_modeswitch/pppd -detach Valdis . Kletnieks (Jan 23)
- Re: usb_modeswitch/pppd -detach Jeffrey Walton (Jan 23)
- Re: usb_modeswitch/pppd -detach srm (Jan 21)