Lucene search

Gjoko KrsticZSL-2023-5768

HistoryApr 10, 2023 - 12:00 a.m.

Sielco PolyEco Digital FM Transmitter 2.0.6 Authorization Bypass Factory Reset

2023-04-1000:00:00

Gjoko Krstic

zeroscience.mk

132

sielco

polyeco

digital fm transmitter

authorization bypass

factory reset

improper access control

privilege escalation

security bypass

dos

vulnerability

sielco s.r.l

cpu

fpga

lwip

zero science lab

gjoko krstic

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

9.3 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

39.3%

JSON

Title: Sielco PolyEco Digital FM Transmitter 2.0.6 Authorization Bypass Factory Reset
Advisory ID: ZSL-2023-5768
Type: Local/Remote
Impact: Privilege Escalation, Security Bypass, DoS
Risk: (5/5)
Release Date: 10.04.2023

Summary

PolyEco is the innovative family of high-end digital FM transmitters of Sielco. They are especially suited as high performance power system exciters or compact low-mid power transmitters. The same cabinet may in fact be fitted with 50, 100, 300, 500, 1000W power stage (PolyEco50, 100, 300, 500, 1000).

All features can be controlled via the large touch-screen display 4.3" or remotely. Many advanced features are inside by default in the basic version such as: stereo and RDS encoder, audio change-over, remote-control via LAN and SNMP, “FFT” spectral analysis of the audio sources, SFN synchronization and much more.

Description

Improper access control occurs when the application provides direct access to objects based on user-supplied input. As a result of this vulnerability attackers can bypass authorization and access resources behind protected pages.

Vendor

Sielco S.r.l - <https://www.sielco.org>

Affected Version

PolyEco1000 CPU:2.0.6 FPGA:10.19
PolyEco1000 CPU:1.9.4 FPGA:10.19
PolyEco1000 CPU:1.9.3 FPGA:10.19
PolyEco500 CPU:1.7.0 FPGA:10.16
PolyEco300 CPU:2.0.2 FPGA:10.19
PolyEco300 CPU:2.0.0 FPGA:10.19

Tested On

lwIP/2.1.1 (http://savannah.nongnu.org/projects/lwip)

Vendor Status

[26.01.2023] Vulnerability discovered.
[27.01.2023] Contact with the vendor and CSIRT Italia.
[09.04.2023] No response from the vendor.
[09.04.2023] No response from the CSIRT team.
[10.04.2023] Public security advisory released.

PoC

sielco_polyeco_reset.txt

Credits

Vulnerability discovered by Gjoko Krstic - <[email protected]>

References

[1] <https://packetstormsecurity.com/files/171856/>
[2] <https://www.exploit-db.com/exploits/51368>
[3] <https://exchange.xforce.ibmcloud.com/vulnerabilities/269703>
[4] <https://exchange.xforce.ibmcloud.com/vulnerabilities/253066>
[5] <https://www.cisa.gov/news-events/ics-advisories/icsa-23-299-07>
[6] <https://nvd.nist.gov/vuln/detail/CVE-2023-46664>
[7] <https://vulners.com/cve/CVE-2023-46664>

Changelog

[10.04.2023] - Initial release
[03.11.2023] - Added reference [1], [2], [3], [4], [5], [6] and [7]

Contact

Zero Science Lab

Web: <https://www.zeroscience.mk>
e-mail: [email protected]

<html><body><p>Sielco PolyEco Digital FM Transmitter 2.0.6 Authorization Bypass Factory Reset


Vendor: Sielco S.r.l
Product web page: https://www.sielco.org
Affected version: PolyEco1000 CPU:2.0.6 FPGA:10.19
                  PolyEco1000 CPU:1.9.4 FPGA:10.19
                  PolyEco1000 CPU:1.9.3 FPGA:10.19
                  PolyEco500 CPU:1.7.0 FPGA:10.16
                  PolyEco300 CPU:2.0.2 FPGA:10.19
                  PolyEco300 CPU:2.0.0 FPGA:10.19

Summary: PolyEco is the innovative family of high-end digital
FM transmitters of Sielco. They are especially suited as high
performance power system exciters or compact low-mid power
transmitters. The same cabinet may in fact be fitted with 50,
100, 300, 500, 1000W power stage (PolyEco50, 100, 300, 500,
1000).

All features can be controlled via the large touch-screen display
4.3" or remotely. Many advanced features are inside by default
in the basic version such as: stereo and RDS encoder, audio
change-over, remote-control via LAN and SNMP, "FFT" spectral
analysis of the audio sources, SFN synchronization and much more.

Desc: Improper access control occurs when the application provides
direct access to objects based on user-supplied input. As a result
of this vulnerability attackers can bypass authorization and access
resources behind protected pages.

Tested on: lwIP/2.1.1 (http://savannah.nongnu.org/projects/lwip)


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
Macedonian Information Security Research and Development Laboratory
Zero Science Lab - https://www.zeroscience.mk - @zeroscience


Advisory ID: ZSL-2023-5768
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5768.php


26.01.2023

--


index.htm:
----------
54: function dologin() {
55:             var hash = hex_md5($('#password').val() + id);
56:             $.get('/login.cgi', {
57:                 user: $('#user').val(),
58:                 password: hash,
59:                 id: id
60:             }).done(function (data) {
61:                 var dati = $.parseXML(data);
62:                 id = $(dati).find('id').text();
63:                 user = $(dati).find('u').text();
64:                 if (id == 0)
65:                     window.location.href = '/index.htm';
66:                 else {
67:                     scriviCookie('polyeco', id, 180);
68:                     if (user &gt;= 3)
69:                         window.location.href = '/protect/factory.htm';
70:                     else
71:                         window.location.href = '/protect/index.htm';
72:                 }
73:             });
74:         }


The function 'dologin()' in index.htm is called when a user submits a login form.
It starts by calculating a hash of the user-entered password and a variable 'id'
using the hex_md5 function. Then it makes an HTTP GET request to the 'login.cgi'
endpoint with the user's entered username, the calculated password hash and the
'id' variable as parameters. If the request is successful, the function parses the
XML data returned from the server, extracting the values of the 'id' and 'u' elements.
Then it checks the value of the 'id' variable, if it's equal to 0 then it redirects
the user to '/index.htm', otherwise, it writes a cookie called 'polyeco' with the
value of 'id' and expires after 180 days.

After that it checks the value of the 'user' variable, if it's greater than or equal
to 3, it redirects the user to '/protect/factory.htm', otherwise it redirects the
user to '/protect/index.htm'. An attacker can exploit this by modifying the client-side
JavaScript to always set the 'user' variable to a high value (4), or by tampering with
the data sent to the server during the login process to change the value of the 'user'
variable. It also works if the server's response variable 'user' is modified.
</p></body></html>

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

9.3 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

39.3%

JSON

Related for ZSL-2023-5768