Title: KZTech/JatonTec/Neotel JT3500V 4G LTE CPE 2.0.1 Privilege Escalation
Advisory ID: ZSL-2021-5645
Type: Local/Remote
Impact: Privilege Escalation
Risk: (4/5)
Release Date: 18.03.2021

Summary

JT3500V is a most advanced LTE-A Pro CAT12 indoor Wi-Fi & VoIP CPE product specially designed to enable quick and easy LTE fixed data service deployment for residential and SOHO customers. It provides high speed LAN, Wi-Fi and VoIP integrated services to end users who need both bandwidth and multi-media data service in residential homes or enterprises. The device has 2 Gigabit LAN ports, 1 RJ11 analog phone port, high performance 4x4 MIMO and CA capabilities, 802.11b/g/n/ac dual band Wi-Fi, advanced routing and firewall software for security. It provides an effective all-in-one solution to SOHO or residential customers. It can deliver up to 1Gbps max data throughput which can be very competitive to wired broadband access service.

Description

The application suffers from a privilege escalation vulnerability. The non-privileged default user (user:user123) can elevate his/her privileges by sending a HTTP GET request to the configuration export endpoint and disclose the admin password. Once authenticated as admin, an attacker will be granted access to the additional and privileged pages.

Vendor

KZ Broadband Technologies, Ltd. - http://www.kzbtech.com
Jaton Technology, Ltd. - http://www.jatontec.com
Neotel DOO - https://www.neotel.mk

Affected Version

Model | Firmware

JT3500V | 2.0.1B1064
JT3300V | 2.0.1B1047
AM6200M | 2.0.0B3210
AM6000N | 2.0.0B3042
AM5000W | 2.0.0B3037
AM4200M | 2.0.0B2996
AM4100V | 2.0.0B2988
AM3500MW | 2.0.0B1092
AM3410V | 2.0.0B1085
AM3300V | 2.0.0B1060
AM3100E | 2.0.0B981
AM3100V | 2.0.0B946
AM3000M | 2.0.0B21
KZ7621U | 2.0.0B14
KZ3220M | 2.0.0B04
KZ3120R | 2.0.0B01

Tested On

GoAhead-Webs/2.5.0 PeerSec-MatrixSSL/3.1.3-OPEN
Linux 2.6.36+ (mips)
Mediatek APSoC SDK v4.3.1.0

Vendor Status

[03.02.2021] Vulnerability discovered.
[05.02.2021] Contact with Neotel.
[07.02.2021] Contact with KZ Tech.
[08.02.2021] Contact with Jaton Tech.
[09.02.2021] Contact with Neotel.
[12.02.2021] Contact with MKD-CIRT.
[12.02.2021] MKD-CIRT opens a case, informs Neotel.
[17.03.2021] No response from the vendors.
[18.03.2021] Public security advisory released.

PoC

jt3500v_priv.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://packetstormsecurity.com/files/161891/
[2] https://exchange.xforce.ibmcloud.com/vulnerabilities/198470
[3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28267
[4] https://nvd.nist.gov/vuln/detail/CVE-2021-28267
[5] https://nvd.nist.gov/vuln/detail/CVE-2021-28270
[6] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28270

Changelog

[18.03.2021] - Initial release
[23.03.2021] - Added reference [1] and [2]
[19.06.2021] - Added reference [3], [4], [5] and [6]

Contact

Zero Science Lab

Web: https://www.zeroscience.mk
e-mail: lab@zeroscience.mk