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Insecure Default File System Permissions n Microsoft Versions of Kerio
Software
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SUMMARY
As a result of its collaboration relationship the Secure Computer Group
(SCG) along with dotpi.com Research Labs have determined the following
security issue on some Kerio Software.
Kerio WinRoute Firewall, Kerio ServerFirewall and Kerio MailServer are
installed by default under 'Program Files' system folder. No change is
done to the ACLs after the installation process. As a result, anyone
belonging to the 'Power Users' system group would be able to modify binary
files of services running as LOCALSYSTEM, drop malicious DLLs the plug-ins
folder or perform any change on the XML files where the service settings
are stored.
System administrators should enforce ACL security settings in order solve
this problem. It is also highly recommended to verify this settings as
part of the planning, installation, hardening and auditing processes.
New versions of the software solve this an other minor problems so it is
upgrade its highly recommended.
DETAILS
Vulnerable Systems:
* Kerio WinRoute Firewall version 6.0.8 and prior
* Kerio ServerFirewall version 1.0.0 and prior
* Kerio MailServer version 6.0.4 and prior
Immune Systems:
* Kerio WinRoute Firewall version 6.0.9
* Kerio ServerFirewall version 1.0.1
* Kerio MailServer version 6.0.5
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1023>
CAN-2004-1023
Solutions and recommendations:
Enforce the file system ACLs and/or upgrade to the latest versions:
* Kerio WinRoute Firewall 6.0.9
* Kerio ServerFirewall 1.0.1
* 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.
ADDITIONAL INFORMATION
The information has been provided by <mailto:scg@udc.es> Secure Computer
Group.
The original article can be found at:
<http://research.tic.udc.es/scg/advisories/20041214-2.txt>
http://research.tic.udc.es/scg/advisories/20041214-2.txt
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