Google Picasa 3.5 Buffer Overflow

`Connection of the HackTalk team recently found a buffer overflow in the Picasa software by Google. Below is the write up.  
  
Pentest Information:  
====================  
Connection has discovered a Buffer Overflow in Picasa 3.5 created by Google.  
An attacker is able to overflow the EAX register by creating a text slide with a large block of text.  
  
Details  
=======  
Tested on OS: Windows XP & Windows Vista  
Tested with Software: Debugger & Picasa 3.5  
  
Vulnerable Products: Picasa  
Affected Versions: 3.5  
Vulnerability Type: Buffer Overflow  
Security-Risk: Low  
  
Vendor-URL: http://picasa.google.com  
Preview-URL:  
  
Vendor-Status: Uninformed  
Patch/Fix-Status: Fixed version not released  
Advisory-Status: Published | 29.09.2009  
  
Advisory-URL:  
Report-URL:  
  
Introduction:  
=============  
Picasa is free photo editing software from Google that makes your pictures look great.  
Sharing your best photos with friends and family is as easy as pressing a button! ss.  
  
(from the vendors homepage: http://picasa.google.com)  
  
More Details:  
=============  
Due to the lack of input validation, an attacker is able to overwrite the ECX register and crash the program.  
  
Proof of Concept:  
=================  
Open up Picasa and go to the movie creator. Add a new text slide and input 45440 characters. This will cause the program to crash. The following the the register dump from OllyDBG.  
  
EAX 04875910 ASCII “AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  
ECX 0000007D  
EDX 00000000  
EBX 049364D0 ASCII “AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  
ESP 00129C1C  
EBP 00129C24  
ESI 04939B50 ASCII “AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA  
EDI 04878F90 ASCII “AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA”  
EIP 0098C13E Picasa3.0098C13E  
C 0 ES 0023 32bit 0(FFFFFFFF)  
P 1 CS 001B 32bit 0(FFFFFFFF)  
A 0 SS 0023 32bit 0(FFFFFFFF)  
Z 0 DS 0023 32bit 0(FFFFFFFF)  
S 0 FS 003B 32bit 7FFDF000(FFF)  
T 0 GS 0000 NULL  
D 0  
O 0 LastErr ERROR_SUCCESS (00000000)  
EFL 00010206 (NO,NB,NE,A,NS,PE,GE,G)  
ST0 empty 23.500000000000000000  
ST1 empty 19.000000000000000000  
ST2 empty 19.000000000000000000  
ST3 empty 0.0  
ST4 empty 0.0  
ST5 empty 1.0000000000000000000  
ST6 empty 0.0  
ST7 empty 0.0  
3 2 1 0 E S P U O Z D I  
FST 0020 Cond 0 0 0 0 Err 0 0 1 0 0 0 0 0 (GT)  
FCW 027F Prec NEAR,53 Mask 1 1 1 1 1 1  
  
Security Risk:  
==============  
An attacker may crash Picasa by inputting a large block of text into a slide in the slideshow maker function of Picasa. The security risk is estimated as low.  
  
Author:  
=======  
The Author & Writer is a part of the HackTalk team.  
Connection  
`