Security Advisory 08 for Kolab Server

[Bernhard Herzog]

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Kolab Security Issue 08 20060113
================================

Package:              Kolab Server
Vulnerability:        Verbose logging for connections to port 465 (ssmtp)
		      includes the credentials of the connecting users.
		      Passwords might leak through this.
Kolab Specific:       yes
Impact:               high


Details
- -------

With the default configuration of the Kolab server, when a client
connects to port 465 for secure SMTP and tries to authenticate itself
the credentials will be logged in /kolab/var/postfix/log/postfix.log.
Other unix users on the server system may be able to read that file and
learn passwords from it.

Note that usually postfix.log is world readable with permissions 0644.
You can change this with chmod and in /kolab/etc/fsl/fsl.postfix.

Affected Versions
- -----------------

Vulnerable: Stable Kolab Servers 2.0.1 2.0.2  
Untested: Kolab Server 2.0

Vulnerable: Development Kolab Servers <= pre-2.1-20051215

Fixes
- -----

Upgrade to Kolab Server 2.0.3

Alternatively: Remove the "-v" option from the line starting with "465"
in the master.cf.template and then run kolabconf to refresh postfix.

Timeline
- --------
2005-11-02 Issue968 was filed, assumed logging only on failure.
2005-12-19 Discovered that logging happened alway.
2006-01-04 Security implications of world readable logfile noticed.
2006-01-11 Analysis, fix and new server release with fix.
2006-01-13 Advisory published.
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