(Gentoo Issues Fix) wpa_supplicant Key Data Length Missing Validation Lets Remote Users Crash the Service
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SecurityTracker Alert ID: 1013227 |
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SecurityTracker URL: http://securitytracker.com/id/1013227
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Feb 17 2005
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 0.2.7 and 0.3.8
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Description:
A vulnerability was reported in wpa_supplicant in the processing of WPA2 frames. A remote user can cause denial of service conditions.
The software does not properly validate the Key Data Length in received EAPOL-Key frames. A remote user can send a specially crafted packet to trigger a buffer overflow and cause wpa_supplicant to crash.
If WPA2 is enabled, a remote user can send a specially crafted EAPOL-Key frame (message 1 of 4-Way Handshake) to trigger the buffer overflow. If WPA2 is not enabled, a remote authenticated user can send specially crafted frames (message 3 of 4-Way Handshake) to trigger the overflow.
The vulnerability resides in 'wpa.c'.
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Impact:
A remote user can cause the target service to crash.
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Solution:
Gentoo has released a fix and indicates that all wpa_supplicant users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-wireless/wpa_supplicant-0.2.7"
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Vendor URL: hostap.epitest.fi/wpa_supplicant/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Wed, 16 Feb 2005 20:23:50 +0100
Subject: [gentoo-announce] [ GLSA 200502-22 ] wpa_supplicant: Buffer overflow vulnerability
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Gentoo Linux Security Advisory GLSA 200502-22
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http://security.gentoo.org/
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Severity: Normal
Title: wpa_supplicant: Buffer overflow vulnerability
Date: February 16, 2005
Bugs: #81993
ID: 200502-22
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Synopsis
========
wpa_supplicant contains a buffer overflow that could lead to a Denial
of Service.
Background
==========
wpa_supplicant is a WPA Supplicant with support for WPA and WPA2 (IEEE
802.11i / RSN).
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-wireless/wpa_supplicant < 0.2.7 >= 0.2.7
Description
===========
wpa_supplicant contains a possible buffer overflow due to the lacking
validation of received EAPOL-Key frames.
Impact
======
An attacker could cause the crash of wpa_supplicant using a specially
crafted packet.
Workaround
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There is no known workaround at this time.
Resolution
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All wpa_supplicant users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-wireless/wpa_supplicant-0.2.7"
References
==========
[ 1 ] wpa_supplicant Announcement
http://lists.shmoo.com/pipermail/hostap/2005-February/009465.html
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200502-22.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
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