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Fixed a bug in --data-length parsing. User input was not being checked and in some cases that resulted in useless buffer allocations and unpredictable payload lengths. Check http://seclists.org/nmap-dev/2009/q2/0763.html for a complete description of the problem.

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This commit is contained in:
luis
2009-07-04 21:15:13 +00:00
parent 7da44a92ef
commit 98aedb8d1c
2 changed files with 11 additions and 7 deletions
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14
nmap.cc
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@@ -900,13 +900,13 @@ int nmap_main(int argc, char *argv[]) {
o.setVersionTrace(true);
o.debugging++;
} else if (optcmp(long_options[option_index].name, "data-length") == 0) {
o.extra_payload_length = atoi(optarg);
if (o.extra_payload_length < 0) {
fatal("data-length must be greater than 0");
} else if (o.extra_payload_length > 0) {
o.extra_payload = (char *) safe_malloc(o.extra_payload_length);
get_random_bytes(o.extra_payload, o.extra_payload_length);
}
o.extra_payload_length = (int)strtoll( optarg, NULL, 10);
if (o.extra_payload_length < 1 || o.extra_payload_length > MAX_PAYLOAD_ALLOWED)
fatal("data-length must be between 1 and %d", MAX_PAYLOAD_ALLOWED);
if (o.extra_payload_length > 1400 ) /* 1500 - IP with opts - TCP with opts. */
error("WARNING: Payloads bigger than 1400 bytes may not be sent successfully.");
o.extra_payload = (char *) safe_malloc(o.extra_payload_length);
get_random_bytes(o.extra_payload, o.extra_payload_length);
} else if (optcmp(long_options[option_index].name, "send-eth") == 0) {
o.sendpref = PACKET_SEND_ETH_STRONG;
} else if (optcmp(long_options[option_index].name, "send-ip") == 0) {

4
nmap.h
View File

@@ -399,6 +399,10 @@ void *realloc();
#define MAXHOSTNAMELEN 64
#endif
/* Max payload: Worst case is IPv4 with 40bytes of options and TCP with 20
* bytes of options. */
#define MAX_PAYLOAD_ALLOWED 65535-60-40
#ifndef recvfrom6_t
# define recvfrom6_t int
#endif