[Oisf-users] Alerts about MS08-067

[Peter Manev]

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