Kerio ServerFirewall Discloses Passwords to Local Users
SecurityTracker Alert ID: 1012520|
SecurityTracker URL: http://securitytracker.com/id/1012520
(Links to External Site)
Updated: Dec 15 2004|
Original Entry Date: Dec 15 2004
Disclosure of authentication information|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): prior to 1.0.1|
A vulnerability was reported in the Kerio ServerFirewall. A local user may be able to obtain user passwords.|
The Secure Computer Group at the University of a Coruna and the dotpi.com Information Technologies Research Labs reported that the product uses a symmetric algorithm for encrypting user passwords on the system. A local user with access to the configuration files can use the universal secret key contained within the application to decrypt the user passwords.
Additional details will be disclosed in March 2005.
Javier Munoz of Secure Computer Group is credited with discovering this flaw.
The vendor was notified on October 1, 2004.
A local user can decrypt user passwords.|
The vendor has issued a fixed version (1.0.1) of Kerio ServerFirewall, available at:|
Vendor URL: www.kerio.com/ksf_home.html (Links to External Site)
Access control error|
|Underlying OS: Windows (2000), Windows (2003), Windows (XP)|
Source Message Contents
Subject: [CVE-2004-1022] Insecure Credential Storage on Kerio Software|
Secure Computer Group - University of A Coruna
-- x --
dotpi.com Information Technologies Research Labs
Document title: Insecure Credential Storage on Kerio
Document revision: 1.0
Coordinated release date: 2004/12/14
Vendor Acknowledge date: 2004/10/06
Reported date: 2004/10/01
CVE Name: CAN-2004-1022
Other references: N/A
Impact: Insecure Credential Storage
Recommendation: Update to latest version
Vendor: Kerio Technologies Inc.
Affected software: Kerio WinRoute Firewall (all versions)
Kerio ServerFirewall (all versions)
Kerio MailServer (all versions)
Updates/Patches: Yes (see below)
1. Executive summary:
As a result of its collaboration relationship the Secure Computer
Group (SCG) along with dotpi.com Research Labs have determined
this security issue on Kerio WinRoute Firewall (KWF), Kerio
ServerFirewall (KSF) and Kerio MailServer (KMS).
KWF, KSF and KMS user credential database system uses symmetric
encryption to protect passwords stored on it.
Anyone with a cyphertext of this database (that is, with access to
the configuration files) could reverse the encryption using a
universal secret key hidden into the program logic.
New versions of the software solve this and other minor problems
so it is upgrade its highly recommended.
2. Technical details:
Following the latest trends and approaches to responsible
disclosure, SCG and dotpi.com are going to withhold details of
this flaw for three months.
Full details will be published on 2005/03/14. This three month
window will allow system administrators the time needed to
obtain the patch before the details are released to the general
3. Risk Assessment factors:
The attacker needs access to the user database, which is not
normally a usual condition on a properly hardened firewall and/or
Despite this, special care should be taken on shared environments
where more than one technical staff work together on the firewall
and/or the mail server. This kind of scenarios offer a potential
opportunity for the insiders on the work of stealing identities
and, therefore, breaking access control measures.
It is also important to note that this could be an important
second-stage resource for a successful attacker on an already
compromised firewall and/or mail server.
4. Solutions and recommendations:
Upgrade to the latest versions:
o Kerio Winroute Firewall 6.0.9
o Kerio ServerFirewall 1.0.1
o Kerio MailServer 6.0.5
As in any other case, follow, as much as possible, the Industry
'Best Practices' on Planning, Deployment and Operation on this
kind of services.
Kerio Winroute Firewall 6.0.7 fixed CAN-2004-1022. Kerio Winroute
Firewall 6.0.9 is the current version fixing CAN-2004-1022 and
5. Common Vulnerabilities and Exposures (CVE) project:
The Common Vulnerabilities and Exposures (CVE) project has
assigned the name CAN-2004-1022 to this issue. This is a
candidate for inclusion in the CVE list (http://cve.mitre.org),
which standardizes names for security problems.
1. Special thanks to Vladimir Toncar and Pavel Dobry and the whole
Technical Team from Kerio Technologies (support at kerio.com)
for their quick response and professional handling on this issue.
3. The whole Research Lab at dotpi.com and specially to Carlos Veira
for his leadership and support.
3. Secure Computer Group at University of A Coruna (scg at udc.es),
and specially to Antonino Santos del Riego powering new research
paths at University of a Coruna.
Javier Munoz (Secure Computer Group) is credited with this discovery.
 Kerio Technologies Inc.
 Kerio WinRoute Firewall Downloads & Updates
 Kerio ServerFirewall Downloads & Updates
 Kerio MailServer Downloads & Updates
 Secure Computer Group. University of A Coruna
 Secure Computer Group. Updated advisory
 dotpi.com Information Technologies S.L.
 dotpi.com Research Labs
Copyright (c) 2002-2004 Secure Computer Group. University of A Coruna
Copyright (c) 2004 dotpi.com Information Technologies S.L.
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If you wish to reprint the whole or any part of this alert in any
other medium other than electronically, please contact the authors
for explicit written permission at the following e-mail addresses:
(scg at udc.es) and (info at dotpi.com).
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