The cfg80211_wext_giwessid function in net/wireless/wext-compat.c in the Linux kernel before 2.6.36-rc3-next-20100831 does not properly initialize certain structure members, which allows local users to leverage an off-by-one error in the ioctl_standard_iw_point function in net/wireless/wext-core.c, and obtain potentially sensitive information from kernel heap memory, via vectors involving an SIOCGIWESSID ioctl call that specifies a large buffer size.

References

• https://nvd.nist.gov/vuln/detail/CVE-2010-2955
• https://bugzilla.redhat.com/show_bug.cgi?id=628434
• http://forums.grsecurity.net/viewtopic.php?f=3&t=2290
• http://git.kernel.org/?p=linux/kernel/git/linville/wireless-2.6.git;a=commit;h=42da2f948d949efd0111309f5827bf0298bcc9a4
• http://grsecurity.net/~spender/wireless-infoleak-fix2.patch
• http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00000.html
• http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
• http://lkml.org/lkml/2010/8/27/413
• http://lkml.org/lkml/2010/8/30/127
• http://lkml.org/lkml/2010/8/30/146
• http://lkml.org/lkml/2010/8/30/351
• http://secunia.com/advisories/41245
• http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.36-rc3-next-20100831.bz2
• http://www.openwall.com/lists/oss-security/2010/08/31/1
• http://www.redhat.com/support/errata/RHSA-2010-0771.html
• http://www.redhat.com/support/errata/RHSA-2010-0842.html
• http://www.securityfocus.com/bid/42885
• http://www.ubuntu.com/usn/USN-1000-1
• http://www.vupen.com/english/advisories/2011/0298
• http://git.kernel.org/?p=linux/kernel/git/linville/wireless-2.6.git%3Ba=commit%3Bh=42da2f948d949efd0111309f5827bf0298bcc9a4