Note: This is an archival copy of Security Sun Alert 238251 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1019295.1.
Solaris 9 Operating System
Solaris 10 Operating System
Date of Workaround Release
Date of Resolved Release
A Security Vulnerability in samba(7) Domain logons may allow execution of Arbitrary code with Root privileges
A stack-based buffer overflow security vulnerability exists in the send_mailslot function in nmbd(8) in Samba 3.0.0 through 3.0.27a when the "domain logons" option is enabled. This vulnerability may allow a remote unprivileged user the ability to execute arbitrary code as "root" user via a GETDC mailslot request composed of a long GETDC string following an offset username in a SAMLOGON logon request.
More info on this issue can be found in the following document:
CVE-2007-6015 at http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6015
2. Contributing Factors
This issue can occur in the following releases:
Note: Solaris 8 does not include the Samba software and is therefore not affected by this issue.
To determine the version of Samba installed on a system, the following command can be run:
% /usr/sfw/sbin/smbd -V
This issue only affects systems configured as Samba servers that have enabled the netlogon service for Windows 9X network logons.
To determine if a system is configured as a Samba server, the following command can be run to check for processes related to Samba:
% ps -ef | grep mbd
If the output shows "smbd" or "nmbd" running as a daemon (with the -D parameter), the system is configured as a Samba server.
To determine if the Samba server has enabled the netlogon service for Windows 9X network logons, the following steps may be employed:
1. Verify that the process "/usr/sfw/sbin/nmbd -D" is running. This may be done using the ps(1) command as shown above.
2. Verify that the "domain logons" configuration parameter is set to "yes" to provide the netlogon service for Windows 9X network logons. This may be verified looking into the /etc/sfw/smb.conf file.
For more details, please see the Samba documentation at:
There are no predictable symptoms that would indicate the described vulnerability has been exploited to run arbitrary code.
To work around the described issue, the netlogon service for Windows 9X network logons may be stopped. This can be achieved by modifying the "domain logons" entry in the /etc/sfw/smb.conf file to "no". The Samba server must be restarted after making this modification for the changes to take effect. This may be done using the following command (as 'root' user):
On Solaris 9:
# /etc/init.d/samba stop
On Solaris 10:
# svcadm disable wins
This issue is addressed in the following releases:
For more information
on Security Sun Alerts, see 1009886.1.
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11-Jun-2008: Updated Contributing Factors and Resolution sections; RESOLVED
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