external/MeshCentral
1
0
Fork 0
mirror of https://github.com/Ylianst/MeshCentral.git synced 2025-03-09 15:40:18 +00:00
Code Issues Releases Wiki Activity

Added AMT MPS input checks.

Browse source
This commit is contained in:
Ylian Saint-Hilaire 2022-03-25 11:02:07 -07:00
parent 629aba7fc8
commit 1bb1dd0f59
1 changed files with 11 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

11
mpsserver.js
View file

@ -584,14 +584,18 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
if (len < 13) return 0;
userAuthRequestCount++;
var usernameLen = common.ReadInt(data, 1);
if ((usernameLen > 2048) || (len < (5 + usernameLen))) return -1;
var username = data.substring(5, 5 + usernameLen);
var serviceNameLen = common.ReadInt(data, 5 + usernameLen);
if ((serviceNameLen > 2048) || (len < (9 + usernameLen + serviceNameLen))) return -1;
var serviceName = data.substring(9 + usernameLen, 9 + usernameLen + serviceNameLen);
var methodNameLen = common.ReadInt(data, 9 + usernameLen + serviceNameLen);
if ((methodNameLen > 2048) || (len < (13 + usernameLen + serviceNameLen + methodNameLen))) return -1;
var methodName = data.substring(13 + usernameLen + serviceNameLen, 13 + usernameLen + serviceNameLen + methodNameLen);
var passwordLen = 0, password = null;
if (methodName == 'password') {
passwordLen = common.ReadInt(data, 14 + usernameLen + serviceNameLen + methodNameLen);
if ((passwordLen > 2048) || (len < (18 + usernameLen + serviceNameLen + methodNameLen + passwordLen))) return -1;
password = data.substring(18 + usernameLen + serviceNameLen + methodNameLen, 18 + usernameLen + serviceNameLen + methodNameLen + passwordLen);
}
//console.log('MPS:USERAUTH_REQUEST user=' + username + ', service=' + serviceName + ', method=' + methodName + ', password=' + password);
@ -874,6 +878,7 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
case APFProtocol.SERVICE_REQUEST: {
if (len < 5) return 0;
var xserviceNameLen = common.ReadInt(data, 1);
if (xserviceNameLen > 2048) return -1;
if (len < 5 + xserviceNameLen) return 0;
var xserviceName = data.substring(5, 5 + xserviceNameLen);
parent.debug('mpscmd', '--> SERVICE_REQUEST', xserviceName);
@ -884,6 +889,7 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
case APFProtocol.GLOBAL_REQUEST: {
if (len < 14) return 0;
var requestLen = common.ReadInt(data, 1);
if (requestLen > 2048) return -1;
if (len < 14 + requestLen) return 0;
var request = data.substring(5, 5 + requestLen);
//var wantResponse = data.charCodeAt(5 + requestLen);
@ -935,6 +941,7 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
case APFProtocol.CHANNEL_OPEN: {
if (len < 33) return 0;
var ChannelTypeLength = common.ReadInt(data, 1);
if (ChannelTypeLength > 2048) return -1;
if (len < (33 + ChannelTypeLength)) return 0;
// Decode channel identifiers and window size
@ -944,12 +951,14 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
// Decode the target
var TargetLen = common.ReadInt(data, 17 + ChannelTypeLength);
if (TargetLen > 2048) return -1;
if (len < (33 + ChannelTypeLength + TargetLen)) return 0;
var Target = data.substring(21 + ChannelTypeLength, 21 + ChannelTypeLength + TargetLen);
var TargetPort = common.ReadInt(data, 21 + ChannelTypeLength + TargetLen);
// Decode the source
var SourceLen = common.ReadInt(data, 25 + ChannelTypeLength + TargetLen);
if (SourceLen > 2048) return -1;
if (len < (33 + ChannelTypeLength + TargetLen + SourceLen)) return 0;
var Source = data.substring(29 + ChannelTypeLength + TargetLen, 29 + ChannelTypeLength + TargetLen + SourceLen);
var SourcePort = common.ReadInt(data, 29 + ChannelTypeLength + TargetLen + SourceLen);
@ -1076,6 +1085,7 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
if (len < 9) return 0;
var RecipientChannel = common.ReadInt(data, 1);
var LengthOfData = common.ReadInt(data, 5);
if (SourceLen > 1048576) return -1;
if (len < (9 + LengthOfData)) return 0;
parent.debug('mpscmddata', '--> CHANNEL_DATA', RecipientChannel, LengthOfData);
var cirachannel = socket.tag.channels[RecipientChannel];
@ -1103,6 +1113,7 @@ module.exports.CreateMpsServer = function (parent, db, args, certificates) {
{
if (len < 5) return 0;
var jsondatalen = common.ReadInt(data, 1);
if (jsondatalen > 1048576) return -1;
if (len < (5 + jsondatalen)) return 0;
var jsondata = null, jsondatastr = data.substring(5, 5 + jsondatalen);
try { jsondata = JSON.parse(jsondatastr); } catch (ex) { }