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MitraStar DSL-100HN-T1/GPT-2541GNAC Privilege Escalation

MitraStar DSL-100HN-T1/GPT-2541GNAC Privilege Escalation
Posted Oct 28, 2017
Authored by j0lama

MitraStar DSL-100HN-T1 and GPT-2541GNAC routers suffer from a privilege escalation vulnerability.

tags | exploit
SHA-256 | 5426db97308973a77a4108df438988e172dce98e20172ca1738636474257ce4d

MitraStar DSL-100HN-T1/GPT-2541GNAC Privilege Escalation

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# Exploit Title: Privilege escalation MitraStar routers
# Date: 28-10-2017
# Exploit Author: j0lama
# Vendor Homepage: http://www.mitrastar.com/
# Provider Homepage: https://www.movistar.com/
# Models affected: MitraStar DSL-100HN-T1 and MitraStar GPT-2541GNAC (HGU)
# Software versions: ES_113WJY0b16 (DSL-100HN-T1) and 1.00(VNJ0)b1 (GPT-2541GNAC)
# Vulnerability analysis: http://jolama.es/temas/router-attack/index.php

Description
-----------
SSH has a bad configuration that allows execute commands when you connect avoiding the default shell that the manufacturer provide us.

$ ssh 1234@ip /bin/sh

This give us a shell with root permissions.

Note: the password for 1234 user is under the router.

You can copy all file system to your local machine using scp.
In some of the MitraStar routers there is a zyad1234 user with password zyad1234 that have the same permissions of the 1234 user (root).


Solution
--------
In the latest firmware versions this have been fixed.
If you try to execute scp, the router's configuration file will be copy to your computer instead of any file as occurred before.

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