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madwifi.txt

madwifi.txt
Posted Dec 8, 2006
Authored by Laurent Butti, Jerome RAZNIEWSKI, Julien Tinnes

There is a buffer overflow in the Madwifi Atheros driver in some functions called by SIOCSIWSCAN ioctl.

tags | advisory, overflow
advisories | CVE-2006-6332
SHA-256 | ae78388667ab3deb4319d8f83bc674032a7c7b8df47d26ab5490c18a34bceb0c

madwifi.txt

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Name:           Madwifi SIOCGIWSCAN buffer overflow
Vendor: http://www.madwifi.org
Release date: December, 7th 2006
CVE ID: CVE-2006-6332
Authors: Laurent BUTTI, Jerome RAZNIEWSKI, Julien TINNES


1. Description

There is a buffer overflow in the madwifi Atheros driver in some
functions called by SIOCSIWSCAN ioctl.

This issue is remotely exploitable because ioctl SIOCSIWSCAN may be
called automatically by some connexion managers (either directly, by
using iwlib or by calling iwlist) when trying to get a list of nearby
access points.

2. Details

There is a stack buffer overflow in both the giwscan_cb() and
encode_ie() functions (ieee80211_wireless.c). The first issue, in
giwscan_cb, is related with insufficient checks on the length in some
802.11 information elements which are controlled by the attacker:

memcpy(buf, se->se_wpa_ie, se->se_wpa_ie[1] + 2);

The second issue is improper boundary checks in encode_ie() where ielen
is never checked with bufsize.

for (i = 0; i < ielen && bufsize > 2; i++)
p += sprintf(p, "%02x", ie[i]);

A properly crafted 802.11 beacon or probe response frame will trigger
the bug when a process tries to get scanning results by calling ioctl
SIOCGIWSCAN. The information element used by the attacker can be either
WPA IE, RSN IE, WMM IE or ATH IE and will lead to a kernel stack
overflow.

3. Vendor status

The vendor was notified on December, 6th 2006 and issued version 0.9.2.1
to correct the issue.

4. Authors

Laurent BUTTI <laurent.butti at francetelecom.com>
Jerome RAZNIEWSKI <jerome.razniewski at francetelecom.com>
Julien TINNES <julien.tinnes at francetelecom.com>


--
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