Code:  ip_printts(netdissect_options *ndo,
            register const u_char *cp, u_int length)
 {
	register u_int ptr;
	register u_int len;
	int hoplen;
	const char *type;
 
 	if (length < 4) {
 		ND_PRINT((ndo, "[bad length %u]", length));
		return;
 	}
 	ND_PRINT((ndo, " TS{"));
 	hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 	if ((length - 4) & (hoplen-1))
 		ND_PRINT((ndo, "[bad length %u]", length));
 	ptr = cp[2] - 1;
 	len = 0;
 	if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 		ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
 	switch (cp[3]&0xF) {
 	case IPOPT_TS_TSONLY:
 		ND_PRINT((ndo, "TSONLY"));
		break;
	case IPOPT_TS_TSANDADDR:
		ND_PRINT((ndo, "TS+ADDR"));
		break;
	/*
	 * prespecified should really be 3, but some ones might send 2
	 * instead, and the IPOPT_TS_PRESPEC constant can apparently
	 * have both values, so we have to hard-code it here.
	 */

	case 2:
		ND_PRINT((ndo, "PRESPEC2.0"));
		break;
	case 3:			/* IPOPT_TS_PRESPEC */
		ND_PRINT((ndo, "PRESPEC"));
		break;
	default:
		ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
		goto done;
	}

	type = " ";
 	for (len = 4; len < length; len += hoplen) {
 		if (ptr == len)
 			type = " ^ ";
 		ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
 		       hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
 		type = " ";
	}

done:
	ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));

	if (cp[3]>>4)
 		ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
 	else
 		ND_PRINT((ndo, "}"));

Vulnerability Type: 
CWE ID: CWE-125
Summary: The IP parser in tcpdump before 4.9.2 has a buffer over-read in print-ip.c:ip_printts().
Commit Message: CVE-2017-13037/IP: Add bounds checks when printing time stamp options.

This fixes a buffer over-read discovered by Bhargava Shastry,
SecT/TU Berlin.

Add a test using the capture file supplied by the reporter(s), modified
so the capture file won't be rejected as an invalid capture.