Subject: Madwifi SIOCGIWSCAN ioctl buffer overflow (CVE-2006-6332)
Newsgroups: gmane.linux.drivers.madwifi.user
Date: 2006-12-07 14:34:26 GMT (2 years, 4 weeks, 5 days, 5 hours and 52 minutes ago)
Here is the advisory related to SIOCGIWSCAN buffer overflow. Madwifi 0.9.2.1 corrects the issue. -- Julien TINNES - & france telecom - R&D Division/MAPS/NSS Research Engineer - Internet/Intranet Security GPG: C050 EF1A 2919 FD87 57C4 DEDD E778 A9F0 14B9 C7D6
Name: Madwifi < 0.9.2.1 remote buffer overflow vulnerability 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 giwscan_cb() and encode_ie() Thefunctions (ieee80211_wireless.c). first issue, in giwscan_cb, is Therelated with insufficient checks on the length in some 802.11 Theinformation 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>
------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________ Madwifi-users mailing list Madwifi-users <at> lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/madwifi-users