(Gentoo Issues Fix) BNC Buffer Overflow in getnickuserhost() Function Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1012244 |
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SecurityTracker URL: http://securitytracker.com/id/1012244
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Nov 16 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 2.8.9 and prior versions
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Description:
A buffer overflow vulnerability was reported in BNC in the getnickuserhost() function. A remote user can execute arbitrary code on the proxy.
LSS Security reported that when a target user connects to a remote IRC server via the BNC proxy, the IRC server can send a specially crafted response containing the '!' or '@' characters to overflow a 3 byte buffer. Arbitrary code can be executed.
Leon Juranic is credited with discovering this flaw.
Demonstration exploit code is available at:
http://security.lss.hr/en/PoC/
The original advisory is available at:
http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-11-03
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Impact:
A remote user can execute arbitrary code on the target system with the privileges of the target BNC proxy.
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Solution:
Gentoo has released a fix and indicates that all BNC users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-irc/bnc-2.9.1"
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Vendor URL: www.gotbnc.com/ (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: Tue, 16 Nov 2004 11:05:27 +0100
Subject: [gentoo-announce] [ GLSA 200411-24 ] BNC: Buffer overflow vulnerability
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Gentoo Linux Security Advisory GLSA 200411-24
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http://security.gentoo.org/
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Severity: High
Title: BNC: Buffer overflow vulnerability
Date: November 16, 2004
Bugs: #70674
ID: 200411-24
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Synopsis
========
BNC contains a buffer overflow vulnerability that may lead to Denial of
Service and execution of arbitrary code.
Background
==========
BNC (BouNCe) is an IRC proxy server.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-irc/bnc < 2.9.1 >= 2.9.1
Description
===========
Leon Juranic discovered that BNC fails to do proper bounds checking
when checking server response.
Impact
======
An attacker could exploit this to cause a Denial of Service and
potentially execute arbitary code with the permissions of the user
running BNC.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All BNC users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-irc/bnc-2.9.1"
References
==========
[ 1 ] BNC ChangeLog
http://gotbnc.com/changes.html
[ 2 ] LSS-2004-11-03
http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-11-03
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200411-24.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/2.0
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