CVE-2021-39924 : Exploit Details and Defense Strategies

This CVE record involves a large loop vulnerability in the Bluetooth DHT dissector in Wireshark versions 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17, leading to denial of service through packet injection or crafted capture file.

Understanding CVE-2021-39924

This section provides insights into the vulnerability and its impact.

What is CVE-2021-39924?

The CVE-2021-39924 vulnerability is characterized by a large loop in the Bluetooth DHT dissector within specific versions of Wireshark, allowing attackers to perform denial of service attacks through packet injection or manipulated capture files.

The Impact of CVE-2021-39924

The vulnerability has a high severity base score of 7.5 (High) and a CVSS v3.1 vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, with an availability impact of HIGH and other impacts marked as NONE.

Technical Details of CVE-2021-39924

Explore the technical specifics of the CVE here.

Vulnerability Description

The vulnerability originates from excessive loop iteration in Wireshark.

Affected Systems and Versions

Vendor: Wireshark Foundation
Product: Wireshark
Affected Versions:
Version >=3.4.0, <3.4.10
Version >=3.2.0, <3.2.18

Exploitation Mechanism

The vulnerability can be exploited through packet injection or by utilizing manipulated capture files to trigger denial of service.

Mitigation and Prevention

Learn about the steps to mitigate and prevent the CVE.

Immediate Steps to Take

Update Wireshark to version 3.4.10 or 3.2.18 to eliminate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update software to patch known vulnerabilities.
Implement network monitoring and intrusion detection systems to identify suspicious activities.

Patching and Updates

Ensure timely installation of security patches and updates to avoid similar vulnerabilities.