Backdoor in EE 4GEE HH70

1) Privilege escalation (backdoor)

EUVDB-ID: #VU15548

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2018-10532

CWE-ID: CWE-798 - Use of Hard-coded Credentials

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain full control to the device.

The weakness exists due to use of hardcoded root SSH credentials to be stored within the “core_app” binary utilised by the EE router for networking services. A remote attacker with knowledge of the default password (“REDACTED”) and able to communicate with the SSH server can log into the “admin” user over SSH, discover the hard-coded SSH password using strings on the web server binary, bypass of the “AP Isolation” mode that is supported by the router, as well as the settings for multiple Wireless networks, and compromise the router.

Mitigation

Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

Vulnerable software versions

4GEE: HH70VB-2BE8GB3 HH70_E1_02.00_19

External links

http://blog.jameshemmings.co.uk/2018/10/24/4gee-hh70-router-vulnerability-disclosure/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.