CVE-2020-28926 Explained : Impact and Mitigation

ReadyMedia (aka MiniDLNA) before versions 1.3.0 allows remote code execution through a signedness bug leading to buffer overflow.

Understanding CVE-2020-28926

This CVE involves a vulnerability in ReadyMedia (MiniDLNA) that allows remote code execution.

What is CVE-2020-28926?

ReadyMedia (MiniDLNA) versions prior to 1.3.0 are susceptible to remote code execution. Exploiting this vulnerability involves sending a malicious UPnP HTTP request to the MiniDLNA service using HTTP chunked encoding, which triggers a signedness bug resulting in a buffer overflow during calls to memcpy/memmove.

The Impact of CVE-2020-28926

The exploitation of this vulnerability can lead to unauthorized remote code execution on systems running affected versions of ReadyMedia (MiniDLNA), potentially compromising the confidentiality, integrity, and availability of the system.

Technical Details of CVE-2020-28926

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in ReadyMedia (MiniDLNA) before version 1.3.0 allows attackers to execute remote code by exploiting a signedness bug that triggers a buffer overflow in memcpy/memmove calls.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions before 1.3.0

Exploitation Mechanism

The vulnerability can be exploited by sending a crafted UPnP HTTP request to the MiniDLNA service using HTTP chunked encoding, leading to a buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2020-28926 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update MiniDLNA to version 1.3.0 or newer to mitigate the vulnerability.
Implement network segmentation to limit exposure of vulnerable services.
Monitor network traffic for any suspicious UPnP requests.

Long-Term Security Practices

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

Patching and Updates

Apply security patches provided by the vendor promptly to address the vulnerability and enhance system security.