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pidgin-dos.txt

pidgin-dos.txt
Posted Jun 26, 2008
Authored by Juan Pablo Lopez Yacubian

The Pidgin instant message program version 2.4.1 suffers from a denial of service vulnerability.

tags | advisory, denial of service
SHA-256 | a4442db581be6647a0efcf10c971130def9a826cb75acaba12bb078cdfdb65f8

pidgin-dos.txt

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Application: Pidgin 2.4.1
OS: Linux - Ubuntu 8.04
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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
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