ZDI-08-054: Multiple Vendor libpurple MSN Protocol SLP Message Heap- Overflow Vulnerability

From: zdi-disclosures@3com.com
To: full-disclosure@lists.grok.org.uk,bugtraq@securityfocus.com
Cc: zdi-disclosures@3com.com
Subject: ZDI-08-054: Multiple Vendor libpurple MSN Protocol SLP Message Heap- Overflow Vulnerability

ZDI-08-054: Multiple Vendor libpurple MSN Protocol SLP Message Heap 
Overflow Vulnerability
August 28, 2008

-- CVE ID:

-- Affected Vendors:

-- Affected Products:
Adium Adiumx
Pidgin Pidgin

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
systems with vulnerable installations of messaging applications that
make use of the libpurple library. User interaction is not required to
exploit this vulnerability.

The specific flaw exists in the implementation of the MSN protocol,
specifically the handling of SLP messages. The function
msn_slplink_process_msg() fails to properly validate an offset value
specified in the SLP packet. By providing a specific value, an attacker
can overflow a heap buffer resulting in arbitrary code execution.

-- Vendor Response:
Pidgin has issued an update to correct this vulnerability. More
details can be found at:


-- Disclosure Timeline:
2008-05-27 - Vulnerability reported to vendor
2008-08-28 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Anonymous

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