A flaw in Dell SupportAssist, a pre-installed tool on most Dell computers, could be exploited by hackers to compromise them remotely.
The security researcher Bill Demirkapi (17) has discovered a critical remote code execution vulnerability in the Dell SupportAssist utility that is pre-installed on most Dell computers.
The vulnerability could be exploited by hackers to compromise systems remotely.
Dell SupportAssist software is described as a tool that proactively checks the health of
To solve the problems Dell SupportAssist interacts with the Dell Support website and automatically detect Service Tag or Express Service Code of Dell product.
The utility performs hardware diagnostic tests and analyzes the hardware configuration of the system, including installed device drivers, and is able to install missing or available driver updates.
The software leverages a local web service that is protected using the “Access-Control-Allow-Origin” response header and implementing restrictions to accept commands only from the “dell.com” website or its subdomains,
“An important integrity check for us is in ClientServiceHandler
Demirkapi discovered that it is possible to bypass the protections implemented by Dell and download and execute malicious code from a remote server under the control of the attackers.
“To bypass the Referer/Origin check, we have a few options:
- Find a Cross Site Scripting vulnerability in any of Dell’s websites (I should only have to find one on the sites designated for SupportAssist)
- Find a Subdomain Takeover vulnerability
- Make the request from a local program
- Generate a random subdomain name and use an external machine to DNS Hijack the victim. Then, when the victim requests [random].dell.com, we respond with our server.”
Dell acknowledged the flaw as explained in a security advisory and released a security update to address it:
The remote code execution flaw, tracked as CVE-2019-3719, affects Dell SupportAssist Client versions prior to version 126.96.36.199.
The expert published a video PoC of the hack and the source code of the proof of concept:
The post How to Hack Dell computers exploiting a flaw in pre-installed Dell SupportAssist appeared first on Security Affairs.