CVE-2024-24681: Insecure AES key in Yealink Configuration Encrypt Tool
2024-2-21 14:8:46 Author: seclists.org(查看原文) 阅读量:33 收藏
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From: "Jeroen J.A.W. Hermans via Fulldisclosure" <fulldisclosure () seclists org>
Date: Tue, 20 Feb 2024 13:50:33 +0100
CloudAware Security Advisory

CVE-2024-24681: Insecure AES key in Yealink Configuration Encrypt Tool


========================================================================
Summary
========================================================================
A single, vendorwide, hardcoded AES key in the configuration tool used to
encrypt provisioning documents was leaked leading to a compromise of
confidentiality of provisioning documents.

========================================================================
Product
========================================================================
* Yealink Configuration Encrypt Tool (AES version)
* Yealink Configuration Encrypt Tool (RSA version <v1.2)

========================================================================
Detailed description
========================================================================
The Yealink Configuration Encrypt Tool facilites provisioning and configuration mangement of Yealink products, such as VoIP phones. The tool created AES encrypted provisioning 
documents, containing configuration directives such as
username=user1
passwword=passw0rd!
serverhost=sip.host.com
callerid=+19051231212
The files created by this tool are then transferred to the Yealink equipment. The equipment 
decrypts the files and uses them to configure itself.
This process needs to be secure. So these files are encrypted.
The decryption is done by a static, hardcoded, key that is identical across all installs and customers. After decryption of this file by the hardcoded AES key confidential information, 
such as user passwords are visible in plain text.
This implies that knowledge of this hardcoded key allows for the disclosure of sensitive information from the configuration files, or that files with different information can be 
introduced and are axiomatically trusted by the phone.
As this key is static - this includes historic files from any customer that used this tool. 
The vendor has fixed this in version 1.2 of the Configuration Encrypt Tool.

========================================================================
Solution
========================================================================
1) Upgrade Yealink Configuration Encrypt Tool to version 1.2
2) Evaluate the impact of the disclosure of any configurations rolled out with prior versions of this tool (including, specifically, the leaking of passwords) 

========================================================================
Mitigation
========================================================================
1) If an upgrade is not an option - as `anyone' can create valid configuration files; ensure that affected equipment is unable to reach provisioning servers. 2) Evaluate the impact of the disclosure of any configurations rolled out prior 
to these mitigation steps

========================================================================
Weblinks
========================================================================
https://github.com/gitaware/CVE/tree/main/CVE-2024-24681

========================================================================
History
========================================================================
early 2020, release of Configuration Encrypt Tool v1 containing RSA encryption method 
juli 2022, Yealink informed “old” AES key still present and working in tool
2023, new version of Configuration Encrypt Tool v1.2 without a hardcoded AES 
encryptionkey

Attachment: OpenPGP_0x52DD23305307A27C.asc
Description: OpenPGP public key

Attachment: OpenPGP_signature.asc
Description: OpenPGP digital signature

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  • CVE-2024-24681: Insecure AES key in Yealink Configuration Encrypt Tool Jeroen J.A.W. Hermans via Fulldisclosure (Feb 20)

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