Security Incidents mailing list archives
Re: Possible Mail server compromise ?
From: "Faas M. Mathiasen" <faas.m.mathiasen () googlemail com>
Date: Mon, 4 Feb 2008 22:57:14 +0100
Dear Tony, Thank you for your input, it seems that the "data" was sent FROM the mail server and the data is not e-mails. I know that there are "vulnerabilities in Exchange" I was asking if there are new (0day) vulnerabilities that have not been patched and can be exploited remotely - from the outside. We took great care to harden these servers and they are (of course) not reachable from the "outside". Please understand that I cannot go into much detail, maybe you are underestimating our competence, but your verizon so..obviously you know better. ;) On Feb 4, 2008 10:39 PM, Tony Maupin <tony () themaupins com> wrote:
Faas, I would have to agree with Jon Kibler's response, but would like to add that there are vulnerabilities in Exchange that you may be a victim of. Most of the time these things happen from other processes/applications/vulnerabilities on the internal network that are leveraging your mail infrastructure to distribute collateral. You should consider engaging a trusted security vendor for professional services. This could be something simple, but it could also be a huge problem. This doesn't seem to be the core competency of your group and some things are better left to those who have the knowledge and experience. Tony Maupin, CISSP, CCNA, CCSA, MCSE, PMP, VCI, ACI, SCSA Senior Risk Consultant Network & Information Security Verizon Business Security Solutions Powered by Cybertrust U.S. Professional Security Services San Antonio, Texas Mobile: 210-563-2160 Tony.Maupin () VerizonBusiness com http://www.verizonbusiness.com/us/security/ On Feb 4, 2008 2:05 PM, Jon R. Kibler <Jon.Kibler () aset com> wrote:Faas M. Mathiasen wrote:Dear List, "We" have noticed a odd traffic pattern emerging from our mail servers, an important amount of data left our network over the mail server. Please understand "we" would like to remain anonymous at this point. We monitored our mail servers for availability and the patch level is as to latest specifications, additionally we have anti-virus software installed on all E-mail servers. Is anybody aware of an unpatched exploit against Exchange Server 2007 ? Is there any other threat we have not taken into consideration ? Do you have recommendations as to how to proceed ? Obviously our mail server hold important information and we can't simply turn them off, though we have procedures on how to respond to incidents we don't have a procedure for this particular case, as our mail server is inside our company, maintained and updated regularly we had no important reason to believe it could be compromised. We are currently investigating and took it off line for a few hours, while installing a new clean server. Regards, Faas M. Mathiasen CISSP DenmarkThe most frequent 'exploit' I see against exchange servers is where users use their business email address and domain login password to register at some web site and either: a) that site gets compromised and those credentials revealed, or b) more likely, someone registered at a pseudo-phishing site (such as 'all the free porn you can view') using their exchange credentials. In either case, the credentials are then used to force the server to send spam, or if the credentials have admin priv, then mangle the server in any way that they please. Regardless of what happened, the best advise I can give is to IMMEDIATELY change ALL user email passwords, and if any were the same as domain passwords, change those too! GOOD LUCK! Jon Kibler -- Jon R. Kibler Chief Technical Officer Advanced Systems Engineering Technology, Inc. Charleston, SC USA o: 843-849-8214 m: 843-224-2494 ================================================== Filtered by: TRUSTEM.COM's Email Filtering Service http://www.trustem.com/ No Spam. No Viruses. Just Good Clean Email.
Current thread:
- Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- RE: Possible Mail server compromise ? Worrell, Brian (Feb 04)
- Re: Possible Mail server compromise ? Jon R. Kibler (Feb 04)
- Re: Possible Mail server compromise ? Tony Maupin (Feb 04)
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- Re: Possible Mail server compromise ? Valdis . Kletnieks (Feb 05)
- Re: Possible Mail server compromise ? Tony Maupin (Feb 04)
- Message not available
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- Message not available
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- Re: Possible Mail server compromise ? Gary Baribault (Feb 04)
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 04)
- Re: Possible Mail server compromise ? Michael Loftis (Feb 13)
- Re: Possible Mail server compromise ? Jon Oberheide (Feb 13)
- Re: Possible Mail server compromise ? Faas M. Mathiasen (Feb 19)
- Re: Possible Mail server compromise ? Bob Toxen (Feb 19)