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List: oisf-users
Subject: Re: [Oisf-users] Alerts about MS08-067
From: corenor <corenor () gmail ! com>
Date: 2013-11-15 17:12:12
Message-ID: CALQnN=WRmLc8OKz0urF-OJhckLybsUDCfuOKSDRSbu2ChD6Tng () mail ! gmail ! com
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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@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@gmail.com>
>> wrote:
>>
>>> On Tue, Nov 5, 2013 at 11:54 AM, Peter Manev <petermanev@gmail.com>
>>> wrote:
>>>
>>>> On Tue, Nov 5, 2013 at 12:42 PM, C. L. Martinez <carlopmart@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@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
>>
> _______________________________________________
> Suricata IDS Users mailing list: oisf-users@openinfosecfoundation.org
> Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
> List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> OISF: http://www.openinfosecfoundation.org/
>
[Attachment #5 (text/html)]
<div dir="ltr"><div>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.<br> </div></div><div \
class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Nov 8, 2013 at 7:16 AM, \
rmkml <span dir="ltr"><<a href="mailto:rmkml@yahoo.fr" \
target="_blank">rmkml@yahoo.fr</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> Hi Carlopmart,<br>
<br>
Well this sig only detect UUID and Bind (not overflow),<br>
<br>
MS08-067 already detected by another sigs:<br>
2008690 + 2008691 + 2008692 + 2008693 + 2008694 + 2008696 +<br>
2008697 + 2008698 + 2008699 + 2008700 + 2008702 + 2008703 +<br>
2008704 + 2008705 + 2008706 + 2008707 + 2008708 + 2008709 +<br>
2008710 + 2008712 + 2008713 + 2008714 + 2008715 + 2008717 +<br>
2008718 + 2008719 + 2008720 + 2008721.<br>
<br>
Maybe disable/delete this sig (2008701) ?<br>
<br>
Regards<span class="HOEnZb"><font color="#888888"><br>
@Rmkml</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
On Tue, 5 Nov 2013, Peter Manev wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> On Tue, Nov 5, 2013 at 12:59 PM, C. L. Martinez <<a \
href="mailto:carlopmart@gmail.com" target="_blank">carlopmart@gmail.com</a>> \
wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"> On Tue, Nov 5, 2013 at 11:54 AM, Peter Manev <<a \
href="mailto:petermanev@gmail.com" target="_blank">petermanev@gmail.com</a>> \
wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"> On Tue, Nov 5, 2013 at 12:42 PM, C. L. Martinez <<a \
href="mailto:carlopmart@gmail.com" target="_blank">carlopmart@gmail.com</a>> \
wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"> Hi all,<br>
<br>
From time to time my suricata sensors (all of them using release<br>
1.4.6) trigger alerts about MS08-06 vulnerability in my servers and/or<br>
workstations (ten or fifteen times a day).<br>
<br>
I run the following nmap script<br>
<a href="http://nmap.org/nsedoc/scripts/smb-check-vulns.html" \
target="_blank">http://nmap.org/nsedoc/<u></u>scripts/smb-check-vulns.html</a> to \
check this<br> vulnerability, and result is not vulnerable. For example:<br>
<br>
root@debian01:/tmp# nmap --script smb-check-vulns.nse -p445 10.15.1.2<br>
<br>
Starting Nmap 6.00 ( <a href="http://nmap.org" target="_blank">http://nmap.org</a> ) \
at 2013-11-05 11:38 UTC<br> Nmap scan report for mytest.server.local (10.15.1.2)<br>
Host is up (0.00049s latency).<br>
PORT STATE SERVICE<br>
445/tcp open microsoft-ds<br>
<br>
Host script results:<br>
> smb-check-vulns:<br>
> MS08-067: NOT VULNERABLE<br>
> Conficker: Likely CLEAN<br>
> regsvc DoS: CHECK DISABLED (add '--script-args=unsafe=1' to run)<br>
> SMBv2 DoS (CVE-2009-3103): CHECK DISABLED (add<br>
'--script-args=unsafe=1' to run)<br>
> MS06-025: CHECK DISABLED (remove 'safe=1' argument to run)<br>
> _ MS07-029: CHECK DISABLED (remove 'safe=1' argument to run)<br>
<br>
Nmap done: 1 IP address (1 host up) scanned in 0.43 seconds<br>
<br>
Then, why this alert is triggered?? Any idea??<br>
</blockquote>
<br>
<br>
What is the sig/alert that is generated ?<br>
</blockquote>
<br>
This one:<br>
<br>
ET-emerging-netbios.rules:<u></u>alert tcp any any -> $HOME_NET 445 \
(msg:"ET<br> NETBIOS Microsoft Windows NETAPI Stack Overflow Inbound - \
MS08-067<br> (11)"; flow:established,to_server; content:"|0B|"; \
offset:2; depth:1;<br> content:"|C8 4F 32 4B 70 16 D3 01 12 78 5A 47 BF 6E E1 \
88|";<br> reference:url,<a \
href="http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx" \
target="_blank">www.microsoft.<u></u>com/technet/security/Bulletin/<u></u>MS08-067.mspx</a>;<br>
reference:cve,2008-4250; reference:url,<a \
href="http://www.kb.cert.org/vuls/id/827267" \
target="_blank">www.kb.cert.org/<u></u>vuls/id/827267</a>;<br> reference:url,<a \
href="http://doc.emergingthreats.net/bin/view/Main/2008701" \
target="_blank">doc.<u></u>emergingthreats.net/bin/view/<u></u>Main/2008701</a>;<br> \
classtype:attempted-admin; sid:2008701; rev:5;)<br> <br>
and sensor alert is:<br>
<br>
11/05/2013-08:05:11.830795 [**] [1:2008701:5] ET NETBIOS Microsoft<br>
Windows NETAPI Stack Overflow Inbound - MS08-067 (11) [**]<br>
[Classification: Attempted Administrator Privilege Gain] [Priority: 1]<br>
{TCP} <a href="http://10.17.23.33:1306" target="_blank">10.17.23.33:1306</a> -> <a \
href="http://10.15.1.2:445" target="_blank">10.15.1.2:445</a><br> <br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> Do you alert when doing the scan (if you run the scan fro \
the "external net") ?<br> </blockquote>
<br>
Nop, alert is triggered when workstations tries to access to file servers ..<br>
<br>
</blockquote>
<br>
Is it possible to share a small traffic pcap, where you can reproduce the issue?<br>
<br>
<br>
-- <br>
Regards,<br>
Peter Manev<br>
</blockquote>
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</div></div></blockquote></div><br></div>
_______________________________________________
Suricata IDS Users mailing list: oisf-users@openinfosecfoundation.org
Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
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