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Telus Actiontec WEB6000Q Privilege Escalation

Telus Actiontec WEB6000Q Privilege Escalation
Posted Jun 12, 2019
Authored by Andrew Klaus

Telus Actiontec WEB6000Q with firmware 1.1.02.22 suffers from both local and remote privilege escalation vulnerabilities.

tags | exploit, remote, local, vulnerability
advisories | CVE-2018-15555, CVE-2018-15556, CVE-2018-15557
MD5 | ca74c3825d757d6127b49c81ec399a93

Telus Actiontec WEB6000Q Privilege Escalation

Change Mirror Download
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Hash: SHA256

### Device Details
Discovered By: Andrew Klaus (andrew@aklaus.ca)
Vendor: Actiontec (Telus Branded)
Model: WEB6000Q
Affected Firmware: 1.1.02.22

Reported: July 2018
CVE: CVE-2018-15555 (Main OS)
CVE: CVE-2018-15556 (Quantenna OS)


### Summary of Findings

Both “main” and “quantenna” have a UART header on the motherboard and
each of them provide full shell + bootloader access.

While the main OS has the credentials user: root pass: admin, the
quantenna environment can be accessed with user: root with an empty
password.

I used a Raspberry Pi to interface with the UART header, but there are
USB UART adapters to do the same thing.

Once root access is obtained, TR-069 Updating can be fully disabled,
preventing the vendor from pushing updates to the device.


### Proof of Concept

Hooking up a Raspberry Pi's UART GPIO header to either UART header on
the modem will give a login prompt. root/admin or root/(nopass)
depending on which modem header connected to.


### Enabling SSH daemon on Main OS

After retrieving a root shell on the main OS over UART, SSH can be
enabled by running the following:

# cli -s Device.X_ACTIONTEC_COM_RemoteLogin.Enable int 1
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
dropbear -p 22 -I 1800 &


$ ssh 192.168.1.2 -l admin -oKexAlgorithms=+diffie-hellman-group1-sha1
admin@192.168.1.2's password:

BusyBox v1.17.2 (2016-02-03 21:34:18 PST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
#








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Hash: SHA256

### Device Details
Discovered By: Andrew Klaus (andrew@aklaus.ca)
Vendor: Actiontec (Telus Branded)
Model: WEB6000Q
Affected Firmware: 1.1.02.22

Reported: July 2018
CVE: CVE-2018-15557


### Summary of Findings

Two instances of Linux run on the WEB6000Q. One is the “main” instance
that runs the web management server, TR-069 daemon, etc., while the
other is the "quantenna" management OS used to manage the wireless.

By hardcoding an IP address in the 169.254.1.0/24 network, and being on
the same layer 2 network, root telnet access can be obtained on the
"quantenna" management environment by accessing:

Host: 169.254.1.2
Port: 23
Login: root (no password prompted)


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