full-disclosure - Heap overflow in PeerCast 0.1217

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Message-Id: <20071217182204.2c122c6c.aluigi@autistici.org>
Date: Mon, 17 Dec 2007 18:22:04 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com,
	news@...uriteam.com, full-disclosure@...ts.grok.org.uk, vuln@...unia.com,
	packet@...ketstormsecurity.org
Subject: Heap overflow in PeerCast 0.1217


#######################################################################

                             Luigi Auriemma

Application:  PeerCast
              http://www.peercast.org
Versions:     <= 0.1217 and SVN <= 344
Platforms:    Windows, plugin for Winamp, Linux and Mac
Bug:          heap overflow
Exploitation: remote
Date:         17 Dec 2007
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org


#######################################################################


1) Introduction
2) Bug
3) The Code
4) Fix


#######################################################################

===============
1) Introduction
===============


PeerCast is a multi platform open source software for peer2peer radio
streaming.
The broadcasters are visible at http://yp.peercast.org


#######################################################################

======
2) Bug
======


The handshakeHTTP function which handles all the requests received by
the other clients is vulnerable to a heap overflow which allows an
attacker to fill the loginPassword and loginMount buffers located in
the Servent class with how much data he wants.

>>From servhs.cpp:

void Servent::handshakeHTTP(HTTP &http, bool isHTTP)
{
    char *in = http.cmdLine;
    ...
    }else if (http.isRequest("SOURCE"))
    {
        if (!isAllowed(ALLOW_BROADCAST))
        ...
            mount = in+strlen(in);
            while (*--mount)
                if (*mount == '/')
                {
                    mount[-1] = 0; // password preceeds
                    break;
                }
            strcpy(loginPassword,in+7);
        ..
        if (mount)
            strcpy(loginMount,mount);
            ...

ALLOW_BROADCAST ("allowBroadcast" in peercast.ini) is enabled by
default.


#######################################################################

===========
3) The Code
===========


http://aluigi.org/poc/peercasthof.zip


#######################################################################

======
4) Fix
======


Version 0.1218 or SVN 347


#######################################################################


--- 
Luigi Auriemma
http://aluigi.org

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