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Security Advisory: Cisco Secure ACS Unix Acme.server Information Disclosure
Vulnerability
=========================================================================
Revision 1.0
For Public Release 2002 July 2 10:00 (UTC -0800 )
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Summary
=======
Cisco Secure Access Control Server for Unix implements the Acme.server and
is therefore vulnerable to a directory traversal vulnerability. The fix
has been included in ACS Unix version 2.3.6.1 which is currently available.
This vulnerability is detailed in Cisco Bug ID CSCdu47965.
This advisory is available at:
http://www.cisco.com/warp/public/707/acmeweb-acsunix-dirtravers-vuln-pub.shtml.
Affected Products
=================
The defects described in this document are present in releases beginning
with version 2.0 up to and including version 2.3.5.1 of Cisco Secure ACS
for Unix Server.
Cisco Secure ACS for Windows NT is not vulnerable to this issue. Cisco
Access Registrar is not vulnerable to this issue.
Details
=======
This vulnerability exists within the Acme.server program that is part of
the Cisco Secure ACS Unix installation. This vulnerability has been
repaired in the Acme.server utility. The patch is available for Cisco
customers, and has now been incorporated into the Cisco Secure ACS Unix
product.
The vulnerability is triggered when someone browses to the server URL and
adds trailing slashes as in the following example:
http://servername:9090///. This exploit will display the files and
filesystem of the target server.
This vulnerability has been assigned Cisco bug ID CSCdu47965.
Impact
======
The impact may vary, depending whether potential attackers have access to
port 9090 on the Cisco Secure ACS computer. This vulnerability could allow
an attacker to view files and directory structures on the target system.
Access to the encrypted password file provided by this vulnerability, for
example, would allow an attacker access through a successful dictionary
attack against the listed accounts.
Customers who may have been vulnerable to attack are advised to review
privileged accounts and any suspicious database changes, and to change
administrative passwords.
Software Versions and Fixes
===========================
There is a patch available, and the fixes are included in Cisco Secure ACS
Unix version 2.3.6.1 and all versions going forward. For existing versions,
the patch may be applied, which resolves the issue. There is no need to
upgrade to a newer version.
Obtaining Fixed Software
========================
Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades
should be obtained through the Software Center on the Cisco worldwide
website at http://www.cisco.com/cgi-bin/tablebuild.pl/cs-acs.
Customers whose Cisco products are provided or maintained through prior or
existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for assistance with the upgrade, which should be free
of charge.
Customers who purchase direct from Cisco but who do not hold a Cisco
service contract and customers who purchase through third-party vendors but
are unsuccessful at obtaining fixed software through their point of sale
should get their patch upgrades by contacting the Cisco Technical
Assistance Center (TAC). TAC contacts are as follows: +1 800 553 2447
(toll-free from within North America) +1 408 526 7209 (toll call from
anywhere in the world) or by email: tac@cisco.com .
Please have your product serial number available and give the URL of this
notice as evidence of your entitlement to the patched software. Patch
requests for non-contract customers must be requested through the TAC.
Please do not contact either "psirt@cisco.com" or
"security-alert@cisco.com" for software upgrades or software patches.
Workarounds
===========
Workarounds for this vulnerability include general recommendations of
protecting the Cisco Secure ACS for Unix with strong firewalls, access
controls, and preventing any external or unauthenticated access to the
system, and to port 9090 in particular. This is an interim workaround
only, and a patch or upgrade is recommended.
For this issue, a patch is available which may be installed in place of an
upgrade. The patch instructions are available through the TAC. This patch
fixes the security problem with the Acme.server. It includes the modified
files provided by Acme. This patch can be applied for any supported version
of Cisco Secure, that is, CiscoSecure/Unix 2.3(3) or later. The patch
consists of one file: FastAdmin/Acme.zip.
Patch Installation Instructions
To install the patch, follow the instructions below. The commands need to
be executed on your Cisco Secure ACS Unix by the administrator.
1. Stop Cisco Secure by entering the command:
/etc/rc0.d/K80CiscoSecure
2. Change to the base directory where Cisco Secure is installed.
cd $BASEDIR
3. Copy the compressed tar file Acme-Patch.tar.Z into the current
directory.
4. Uncompress and untar the file.
uncompress Acme-Patch.tar.Z
tar xvf Acme-Patch.tar
5. Start Cisco Secure with the command:
/etc/rc2.d/S80CiscoSecure
Exploitation and Public Announcements
=====================================
The issue with the Acme.server was posted to the Bugtraq list June 2001
http://online.securityfocus.com/archive/1/188141,
although no specific mention of the Cisco product was made in the original
posting. Cisco PSIRT is not aware of any malicious use of the
vulnerability described in this advisory.
Status of This Notice: FINAL
============================
This is a final field notice. Although Cisco cannot guarantee the accuracy
of all statements in this notice, all the facts have been checked to the
best of our ability. Cisco does not anticipate issuing updated versions of
this notice unless there is some material change in the facts. Should there
be a significant change in the facts, Cisco may update this notice.
Distribution
============
This notice will be posted on the Cisco worldwide website at
http://www.cisco.com/warp/public/707/acmeweb-acsunix-dirtravers-vuln-pub.shtml.
In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following
e-mail and Usenet news recipients:
* cust-security-announce@cisco.com
* bugtraq@securityfocus.com
* first-teams@first.org (includes CERT/CC)
* cisco@spot.colorado.edu
* comp.dcom.sys.cisco
* firewalls@lists.gnac.com
* Various internal Cisco mailing lists
Future updates of this notice, if any, will be placed on Cisco's worldwide
web server, but may or may not be actively announced on mailing lists or
newsgroups. Users concerned about this problem are encouraged to check the
URL given above for any updates.
Revision History
================
Revision2002 July 2 - 10:00 Initial Public Release
1.0 (UTC -0800)
Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and registering to
receive security information from Cisco, is available on Cisco's worldwide
website at http://www.cisco.com/warp/public/707/sec_incident_response.shtml
. This includes instructions for press inquiries regarding Cisco security
notices. All Cisco Security Advisories are available at
http://www.cisco.com/go/psirt.
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This notice is Copyright 2002 by Cisco Systems, Inc. This notice may be
redistributed freely after the release date given at the top of the text,
provided that redistributed copies are complete and unmodified, and include
all date and version information.
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