[Oisf-users] Alerts about MS08-067

[corenor]

This is a very well instrumented check/block/sig etc.. for most IDS/IPS
systems..  Probably the script triggers the event since it sends traffic
attempting to detect whether the system is vulnerable.


On Fri, Nov 8, 2013 at 7:16 AM, rmkml <rmkml at yahoo.fr> wrote:

> Hi Carlopmart,
>
> Well this sig only detect UUID and Bind (not overflow),
>
> MS08-067 already detected by another sigs:
> 2008690 + 2008691 + 2008692 + 2008693 + 2008694 + 2008696 +
> 2008697 + 2008698 + 2008699 + 2008700 + 2008702 + 2008703 +
> 2008704 + 2008705 + 2008706 + 2008707 + 2008708 + 2008709 +
> 2008710 + 2008712 + 2008713 + 2008714 + 2008715 + 2008717 +
> 2008718 + 2008719 + 2008720 + 2008721.
>
> Maybe disable/delete this sig (2008701) ?
>
> Regards
> @Rmkml
>
>
>
>
> On Tue, 5 Nov 2013, Peter Manev wrote:
>
>  On Tue, Nov 5, 2013 at 12:59 PM, C. L. Martinez <carlopmart at gmail.com>
>> wrote:
>>
>>> On Tue, Nov 5, 2013 at 11:54 AM, Peter Manev <petermanev at gmail.com>
>>> wrote:
>>>
>>>> On Tue, Nov 5, 2013 at 12:42 PM, C. L. Martinez <carlopmart at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>>  From time to time my suricata sensors (all of them using release
>>>>> 1.4.6) trigger alerts about MS08-06 vulnerability in my servers and/or
>>>>> workstations (ten or fifteen times a day).
>>>>>
>>>>>  I run the following nmap script
>>>>> http://nmap.org/nsedoc/scripts/smb-check-vulns.html to check this
>>>>> vulnerability, and result is not vulnerable. For example:
>>>>>
>>>>> root at debian01:/tmp# nmap --script smb-check-vulns.nse -p445 10.15.1.2
>>>>>
>>>>> Starting Nmap 6.00 ( http://nmap.org ) at 2013-11-05 11:38 UTC
>>>>> Nmap scan report for mytest.server.local (10.15.1.2)
>>>>> Host is up (0.00049s latency).
>>>>> PORT    STATE SERVICE
>>>>> 445/tcp open  microsoft-ds
>>>>>
>>>>> Host script results:
>>>>> | smb-check-vulns:
>>>>> |   MS08-067: NOT VULNERABLE
>>>>> |   Conficker: Likely CLEAN
>>>>> |   regsvc DoS: CHECK DISABLED (add '--script-args=unsafe=1' to run)
>>>>> |   SMBv2 DoS (CVE-2009-3103): CHECK DISABLED (add
>>>>> '--script-args=unsafe=1' to run)
>>>>> |   MS06-025: CHECK DISABLED (remove 'safe=1' argument to run)
>>>>> |_  MS07-029: CHECK DISABLED (remove 'safe=1' argument to run)
>>>>>
>>>>> Nmap done: 1 IP address (1 host up) scanned in 0.43 seconds
>>>>>
>>>>> Then, why this alert is triggered?? Any idea??
>>>>>
>>>>
>>>>
>>>> What is the sig/alert that is generated ?
>>>>
>>>
>>> This one:
>>>
>>> ET-emerging-netbios.rules:alert tcp any any -> $HOME_NET 445 (msg:"ET
>>> NETBIOS Microsoft Windows NETAPI Stack Overflow Inbound - MS08-067
>>> (11)"; flow:established,to_server; content:"|0B|"; offset:2; depth:1;
>>> content:"|C8 4F 32 4B 70 16 D3 01 12 78 5A 47 BF 6E E1 88|";
>>> reference:url,www.microsoft.com/technet/security/Bulletin/MS08-067.mspx;
>>> reference:cve,2008-4250; reference:url,www.kb.cert.org/vuls/id/827267;
>>> reference:url,doc.emergingthreats.net/bin/view/Main/2008701;
>>> classtype:attempted-admin; sid:2008701; rev:5;)
>>>
>>> and sensor alert is:
>>>
>>> 11/05/2013-08:05:11.830795  [**] [1:2008701:5] ET NETBIOS Microsoft
>>> Windows NETAPI Stack Overflow Inbound - MS08-067 (11) [**]
>>> [Classification: Attempted Administrator Privilege Gain] [Priority: 1]
>>> {TCP} 10.17.23.33:1306 -> 10.15.1.2:445
>>>
>>>  Do you alert when doing the scan (if you run the scan fro the "external
>>>> net") ?
>>>>
>>>
>>> Nop, alert is triggered when workstations tries to access to file
>>> servers ..
>>>
>>>
>> Is it possible to share a small traffic pcap, where you can reproduce the
>> issue?
>>
>>
>> --
>> Regards,
>> Peter Manev
>>
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