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Correct RPC reserved port range is 512-1023

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Some RPC services are strict about this and reject calls when the source port
is outside this range, causing nmap RPC calls to fail 50% of the time.
This commit is contained in:
nnposter
2020-02-29 22:29:51 +00:00
parent 6753d2efdd
commit 80f4733c32
2 changed files with 5 additions and 2 deletions
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3
CHANGELOG
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@@ -48,6 +48,9 @@ o [NSE][GH#1838] Scripts dhcp-discover and broadcast-dhcp-discover now support
o [NSE] Code improvements in RPC Dump, benefitting NFS-related scripts
[nnposter]
o [NSE] RPC code was using incorrect port range, which was causing some calls,
such as NFS mountd, to fail intermittently [nnposter]
o [NSE][GH#1876] XML output from script ssl-cert now includes RSA key modulus
and exponent [nnposter]

4
nselib/rpc.lua
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@@ -172,7 +172,7 @@ Comm = {
if nmap.is_privileged() then
-- Try to bind to a reserved port
for i = 1, 10, 1 do
local resvport = math.random(1, 1024)
local resvport = math.random(512, 1023)
socket = new_socket()
status, err = socket:bind(nil, resvport)
if status then
@@ -189,7 +189,7 @@ Comm = {
if nmap.is_privileged() then
-- Try to bind to a reserved port
for i = 1, 10, 1 do
local resvport = math.random(1, 1024)
local resvport = math.random(512, 1023)
socket = new_socket("udp")
status, err = socket:bind(nil, resvport)
if status then