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  3proxy double free() security vulnerability

  3proxy 0.5.3j released (bugfix)

From:xiaojunli.air <xiaojunli.air_(at)_gmail.com>
Date:23.10.2007
Subject:3proxy double free vulnerability

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3proxy double free vulnerability
[Security Advisory]

Advisory: [AD_LAB-07006] 3proxy double free vulnerability
Class: Design Error
DATE:10/22/2007
CVEID:CVE-2007-5622
Vulnerable:
       3proxy <=0.5.3i
Vendor:
       http://www.3proxy.ru/

I.Synopsis

A vulnerability has been discovered in 3proxy.

II.DETAILS:
- ----------
Background

3proxy is a multi-protocol proxy, including HTTP/HTTPS/FTP and SOCKS
support.

Description

       There is a double free vulnerability in function ftpprchild().
...
if (!strncasecmp((char *)buf, "OPEN ", 5)){
       if(param->hostname) myfree(param->hostname); <--first free
       if(parsehostname((char *)buf+5, param, 21)){RETURN(803);}

the parsehostname will free param->hostname again.
int parsehostname(char *hostname, struct clientparam *param, unsigned
short port){
               char *sp;
       
               if(!hostname || !*hostname)return 1;
               if ( (sp = strchr(hostname, ':')) ) *sp = 0;
               if(param->hostname) myfree(param->hostname); <-- double free


Impact
       A remote attacker can cause instability and potentially crash a service by
issuing "OPEN" command for FTP proxy more than once.

Resolution
==========
New version can be downloaded from

http://3proxy.ru/download/

III.CREDIT:
- ----------
   Venustech AD-LAB discovery this vuln. Thank to all Venustech AD-Lab
guys.

V.DISCLAIMS:
- -----------

The information in this bulletin is provided "AS IS" without warranty of
any
kind. In no event shall we be liable for any damages whatsoever
including direct,
indirect, incidental, consequential, loss of business profits or special
damages.

Copyright 1996-2007 VENUSTECH. All Rights Reserved. Terms of use.

VENUSTECH Security Lab
VENUSTECH INFORMATION TECHNOLOGY CO.,LTD(http://www.venustech.com.cn)

Security
Trusted {Solution} Provider
Service
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