(Gentoo Issues Fix) FreeRADIUS 'Ascend-Send-Secret' Processing Error Lets Remote Users Crash the Service
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SecurityTracker Alert ID: 1011395 |
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SecurityTracker URL: http://securitytracker.com/id/1011395
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CVE Reference:
CAN-2004-0938, CAN-2004-0960, CAN-2004-0961
(Links to External Site)
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Updated: Oct 19 2004
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Original Entry Date: Sep 23 2004
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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): 1.0.0
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Description:
A vulnerability was reported in FreeRADIUS. A remote user can cause the target RADIUS service to crash.
The VulnDisco RADIUS test suite includes tests for a previously unreported denial of service vulnerability in FreeRADIUS 1.0.0.
The vendor reported that Ascend-Send-Secret, like Tunnel-Password, requires an "original" packet to decode the attribute [CVE: ]. The software checks for Tunnel-Password, but not Ascend-Send-Secret.
The flaw resides in 'radius.c' and 'eap_tls.c'.
The vendor also reported that a remote user can supply malformed USR vendor-specific attributes to invoke a memcpy() operation with a '-1' argument, causing the RADIUS service to crash [CVE: CAN-2004-0960].
The vendor also reported that a remote user can send a series of Access-Request packets with Ascend-Send-Secret, Ascend-Recv-Secret, or Tunnel-Password attributes to cause the service to consume all available memory [CVE: CAN-2004-0961].
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Impact:
A remote user can cause the RADIUS service to crash.
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Solution:
Gentoo has released a fix and indicates that all FreeRADIUS users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=net-dialup/freeradius-1.0.1"
# emerge ">=net-dialup/freeradius-1.0.1"
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Vendor URL: www.freeradius.org/ (Links to External Site)
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Cause:
Exception handling 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, 22 Sep 2004 12:06:42 +0200
Subject: [gentoo-announce] [ GLSA 200409-29 ] FreeRADIUS: Multiple Denial of Service vulnerabilities
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Gentoo Linux Security Advisory GLSA 200409-29
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http://security.gentoo.org/
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Severity: Normal
Title: FreeRADIUS: Multiple Denial of Service vulnerabilities
Date: September 22, 2004
Bugs: #60587
ID: 200409-29
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Synopsis
========
Multiple Denial of Service vulnerabilities were found and fixed in
FreeRADIUS.
Background
==========
FreeRADIUS is an open source RADIUS authentication server
implementation.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dialup/freeradius < 1.0.1 >= 1.0.1
Description
===========
There are undisclosed defects in the way FreeRADIUS handles incorrect
received packets.
Impact
======
A remote attacker could send specially-crafted packets to the
FreeRADIUS server to deny service to other users by crashing the
server.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All FreeRADIUS users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=net-dialup/freeradius-1.0.1"
# emerge ">=net-dialup/freeradius-1.0.1"
References
==========
[ 1 ] FreeRADIUS Vulnerability Notifications
http://www.freeradius.org/security.html
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200409-29.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 2004 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/1.0
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