Pidgin 2.4.1 Vulnerability
Application: Pidgin 2.4.1
OS: Linux - Ubuntu 8.04
------------------------------------------------------
1 - Description
2 - Vulnerability
3 - POC/EXPLOIT
------------------------------------------------------
Description
Pidgin is an instant messaging program with which you can use a number of
protocols known as (MSN, ICQ, AIM).
While there is Pidgin 2.4.2 version which was not provided in this version so I
could not say whether it was also vulnerable.
------------------------------------------------------
Vulnerability
The vulnerability works sending files with the protocol msn (I did not test at
all protocols),
if a file is sent with a long name and special characters and this causes the
program to break.
If we analyze the vulnerability with a debugger you can see a flaw in the
following function
0xb62abaeb in msn_slplink_process_msg
According with the characters used, the fault may vary in other functions.
------------------------------------------------------
POC/EXPLOIT
For proof of the concept you should create a file either (never mind the
extension) with the maximum allowable characters,
with the following characteristics.
ASCII = (‣ ․ ‥ ? )
HEX = ( 26 23 38 32 32 37 3b 20 26 23 38 32 32 38 3b 20 26 23 38 32 32 39 3b 20
85 )
------------------------------------------------------
Juan Pablo Lopez Yacubian