CVE-2021-44429 : Exploit Details and Defense Strategies

Serva 4.4.0 allows remote attackers to cause a denial of service (daemon crash) via a TFTP read (RRQ) request, aka opcode 1, a related issue to CVE-2013-0145.

Understanding CVE-2021-44429

Serva 4.4.0 vulnerability impacting remote TFTP operations.

What is CVE-2021-44429?

It allows remote attackers to crash the daemon service by sending a specific TFTP read (RRQ) request.

The Impact of CVE-2021-44429

Attackers can trigger a denial of service by exploiting this vulnerability.

Technical Details of CVE-2021-44429

Vulnerability specifics of Serva 4.4.0.

Vulnerability Description

Vulnerability in Serva 4.4.0 leads to a denial of service due to a daemon crash from a manipulated TFTP read request.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Version: N/A

Exploitation Mechanism

Attackers exploit the vulnerability by sending a malicious TFTP read request (RRQ) causing the daemon to crash.

Mitigation and Prevention

Actions to safeguard systems against CVE-2021-44429.

Immediate Steps to Take

Update to a patched version of Serva to mitigate the vulnerability.
Employ firewall rules to restrict TFTP traffic if patching is not immediately possible.

Long-Term Security Practices

Regularly monitor security mailing lists and vendor announcements for updates.
Implement network segmentation to contain potential exploits.

Patching and Updates

Apply the latest patches and updates provided by the vendor to address this vulnerability.