RE: Is this a security breach on my SBS box?
- From: v-terliu@xxxxxxxxxxxxxxxxxxxx (Terence Liu [MSFT])
- Date: Fri, 28 Sep 2007 08:52:22 GMT
Hello David,
Thank you for your post. Let's also thank Steve for the input.
According to your description, I understand that you get many 529 event
errors on your SBS server. If I have misunderstood the problem, please
don't hesitate to let me know.
Based on my research, the behavior can happen when the SBS and client
computer infected by virus/worm or when the machine password is not
properly sync between SBS and internal clients, or the hacker activity that
guessed the password. I suggest we try the following steps to see if we can
resolve this issue:
0. Please install latest update and hotfix on SBS and all internal clients,
meanwhile, install antivirus software on all computers and do full scan.
1. Enable complicated password policy.
Note: The Password Policy need to be configured in Default Domain policy.
We can configure the settings under:
Computer Configuration\Windows Settings\Security Settings\Account
Policies\Password Policy
2. Configure account lockout policy.
Generally, it is a best practices suggestion to set the Threshold value to
10 or higher. This is high enough to rule out user error and low enough to
deter hackers, especially when the password complexity policy is enabled.
For medium security requirement, the recommended configurations are:
Reset account lockout counter after: 30
Account lockout duration: 30
Account Lockout Threshold: 10
For high security requirement, the recommendations are:
Reset account lockout counter after: 30
Account lockout duration: 0
Account Lockout Threshold: 10
For more information, please refer to:
Account Passwords and Policies
http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/
security/bpactlck.mspx
3. Check your firewall to ensure that only the necessary ports are opened.
4. Ensure the above settings have been successfully applied.
1) On the problematic SBS server, please run the following command to
refresh the group policy changes:
GPUPDAGE /FORCE
2) Run SECPOL.MSC and check the above changed password, Account lockout and
auditing policies to see their effective settings, and ensure that the
policies have been applied successfully.
If the policies have been applied successfully, we should have enhanced the
security protection of that server.
5. The issue may occur if the remote SBS server sends broadcast packets to
the network. I suggest you change the "nolmhash" value to "0" in the
following registry key on the SBS server:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\LSA
Reboot the server for this change to take effect and check if the event
does not appear.
6. If the event still appears, go to
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\lanmanserver\Parameters
and set "enablesecuritysignature" and "requiresecuritysignature" to "0".
Reboot the server and check if everything is OK.
7. There are several running processes on the computer that will attempt to
connect using the machine account.
This behavior can happen when the machine password is not properly sync.
In order to reset the machine account password of a domain controller use:
NETDOM RESETPWD /Server:ServerName /UsedD:Administrator /PasswordD:*
The syntax of this command is:
NETDOM RESETPWD /Server:domain-controller /UserD:user /PasswordD:[password
| *]
NETDOM RESETPWD Resets the machine account password for the domain
controller
on which this command is run. Currently there is no support for resetting
the machine password of a remote machine or a member server. All parameters
must be specified.
/Server Name of a specific domain controller that should have its
machine account password reset.
/UserD User account used to make the connection with the domain
controller specified by the /Server argument.
/PasswordD Password of the user account specified with /UserD. A *
means
to prompt for the password
After completing the command, reboot the server.
If we cannot resolve the issue after we perform the above steps, please
kindly help me collect some information for further investigation:
1. Do you get the event 529 at daytime?
2. Save the security event log as evt files on the problematic machine and
send to my mailbox: v-terliu@xxxxxxxxxxxxx
Hope these steps will give you some help.
Thanks and have a nice day!
Best regards,
Terence Liu(MSFT)
Microsoft CSS Online Newsgroup Support
Get Secure! - www.microsoft.com/security
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--------------------
| From: "David" <David@xxxxxxxxxxxxxxxxxxxxxxxxxx>
| Newsgroups: microsoft.public.windows.server.sbs
| Subject: Is this a security breach on my SBS box?
| Date: Thu, 27 Sep 2007 13:58:52 +0100
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|
| Hi All,
|
| This is from a server with SBS2003 standard, two nics and a router but no
| ISA
| Is this a attempted security breach?
| Found this is my server log, sever name is EPPSERVER
| 121 attemps at logons overnight
| Thanks, David
|
| Eg:
| Security Log
| Event ID 529
| No of occurences 121
| last occurance 26/09/2007 18:06
| Unknown user name or bad password
| Reason:
|
| Unknown user name or bad password
|
| User Name:
| 1
|
| Logon Type:
|
| 3
|
| Authentication Package:
|
| MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
|
| Workstation Name:
|
| EPPSERVER
|
| Caller User Name:
|
| EPPSERVER$
|
| Caller Logon ID:
|
| (0x0,0x3E7)
|
| Caller Process ID:
|
| 1516
|
|
|
.
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- Is this a security breach on my SBS box?
- From: David
- Is this a security breach on my SBS box?
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