Connect with us

Hi, what are you looking for?


Cloud Security

Multiple Flaws Patched in WD MyCloud Device Firmware

Vulnerabilities that could allow unauthorized file deletion, unauthorized command execution and authentication bypass impacted WD (Western Digital) MyCloud devices, Trustwave reports. 

Vulnerabilities that could allow unauthorized file deletion, unauthorized command execution and authentication bypass impacted WD (Western Digital) MyCloud devices, Trustwave reports. 

The vulnerabilities were discovered in the MyCloud personal storage device and were reported to Western Digital last year. The company has already released a firmware update to address them. 

All of the issue were found by Trustwave security researcher Martin Rakhmanov in the nas_sharing.cgi binary. 

The first of them was the inclusion of hardcoded credentials in the binary, which could allow anyone to authenticate to the device. 

The hardcoded username was “mydlinkBRionyg” and represents an issue that other security researchers observed as well. Earlier this year, GulfTech’s James Bercegay revealed that this admin user can be used with password “abc12345cba” as a backdoor that could be turned into a root shell. D-Link devices were previously impacted by the same issue. 

The nas_sharing.cgi binary, Rakhmanov discovered, would also allow any user to execute shell commands as root. An attacker looking to exploit the issue can use the “artist” parameter to execute a command to create a file, for example. 

The same faulty binary can be used for arbitrary file deletion, an operation possible through manipulating the “path” parameter, the security researcher says. A command using the “path” parameter can be passed using base64 encoding, the same as with the “artist” parameter.

Advertisement. Scroll to continue reading.

Rakhmanov explains that “usually on embedded systems many processes run unrestricted (i.e. as root) so no security checks are performed at all once a command (file deletion in this case) is about to execute.” 

Trustwave’s researcher also published proof of concept code that combines the hardcoded credential issue with command execution and arbitrary file deletion, respectively. 

Western Digital apparently resolved these issues with the release of firmware version 2.30.172 a couple of months ago. 

The update patched a SMB server (samba) security vulnerability (CVE-2017-7494), along with “critical security vulnerabilities that potentially allowed unauthorized file deletion, unauthorized command execution and authentication bypass,” the company revealed in the release notes (PDF). 

Related: Hardcoded Backdoor Found on Western Digital Storage Devices

Related: Multiple Zero-days Disclosed in Western Digital NAS Storage Devices

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

SecurityWeek’s Threat Detection and Incident Response Summit brings together security practitioners from around the world to share war stories on breaches, APT attacks and threat intelligence.


Securityweek’s CISO Forum will address issues and challenges that are top of mind for today’s security leaders and what the future looks like as chief defenders of the enterprise.


Expert Insights

Related Content

Application Security

Cycode, a startup that provides solutions for protecting software source code, emerged from stealth mode on Tuesday with $4.6 million in seed funding.


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Data Breaches

OpenAI has confirmed a ChatGPT data breach on the same day a security firm reported seeing the use of a component affected by an...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...


The latest Chrome update brings patches for eight vulnerabilities, including seven reported by external researchers.


Patch Tuesday: Microsoft warns vulnerability (CVE-2023-23397) could lead to exploitation before an email is viewed in the Preview Pane.


Apple has released updates for macOS, iOS and Safari and they all include a WebKit patch for a zero-day vulnerability tracked as CVE-2023-23529.

IoT Security

A group of seven security researchers have discovered numerous vulnerabilities in vehicles from 16 car makers, including bugs that allowed them to control car...