oss-security - Re: CVE request: kernel: nl80211: missing check for valid SSID size in scan operations

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Date: Fri, 01 Jul 2011 16:55:17 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com,
        "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: nl80211: missing check for
 valid SSID size in scan operations

On 07/01/2011 04:48 PM, Petr Matousek wrote:
> In both trigger_scan and sched_scan operations, we were checking for the
> SSID length before assigning the value correctly.  Since the memory was
> just kzalloc'ed, the check was always failing and SSID with over 32
> characters were allowed to go through.
> 
> This is causing a buffer overflow when copying the actual SSID to the
> proper place.
> 
> Please note that it needs CAP_NET_ADMIN privileges.
> 
> Upstream commits:
> 208c72f4fe44fe09577e7975ba0e7fa0278f3d03
> 57a27e1d6a3bb9ad4efeebd3a8c71156d6207536
> 
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=718152

Use CVE-2011-2517.

Eugene

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