CVE-2020-14079 : Exploit Details and Defense Strategies

TRENDnet TEW-827DRU devices through 2.06B04 contain a stack-based buffer overflow vulnerability that allows an authenticated user to execute arbitrary code by POSTing to apply.cgi via the action auto_up_fw (or auto_up_lp) with a sufficiently long update_file_name key.

Understanding CVE-2020-14079

This CVE involves a critical buffer overflow issue in TRENDnet TEW-827DRU devices that can be exploited by authenticated users.

What is CVE-2020-14079?

The vulnerability in TRENDnet TEW-827DRU devices allows attackers to execute arbitrary code by exploiting a stack-based buffer overflow in the ssi binary.

The Impact of CVE-2020-14079

The exploitation of this vulnerability can lead to unauthorized execution of arbitrary code by authenticated users, potentially compromising the device and the network it is connected to.

Technical Details of CVE-2020-14079

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The stack-based buffer overflow in the ssi binary of TRENDnet TEW-827DRU devices through version 2.06B04 allows attackers to execute arbitrary code by sending a POST request to apply.cgi with a long update_file_name key.

Affected Systems and Versions

Product: TRENDnet TEW-827DRU
Versions affected: Through 2.06B04

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a POST request to apply.cgi with a long update_file_name key, triggering the buffer overflow and enabling the execution of malicious code.

Mitigation and Prevention

Protecting systems from CVE-2020-14079 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor network traffic for any suspicious activity.
Restrict access to vulnerable devices.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.
Educate users about safe practices to prevent unauthorized access.

Patching and Updates

Vendor patches and updates should be applied as soon as they are released to mitigate the risk of exploitation.