CVE-2021-39922 : Vulnerability Insights and Analysis

CVE-2021-39922, assigned by GitLab, pertains to a buffer overflow vulnerability in Wireshark versions 3.2.0 to 3.2.17 and 3.4.0 to 3.4.9. This vulnerability allows for denial of service through packet injection or crafted capture files.

Understanding CVE-2021-39922

The vulnerability identified in CVE-2021-39922 involves a buffer overflow in the C12.22 dissector in Wireshark versions 3.2.0 to 3.2.17 and 3.4.0 to 3.4.9, leading to potential denial of service attacks.

What is CVE-2021-39922?

CVE-2021-39922 is a buffer overflow vulnerability in Wireshark versions 3.2.0 to 3.2.17 and 3.4.0 to 3.4.9.
The flaw can be exploited through packet injection or manipulated capture files.

The Impact of CVE-2021-39922

Severity: High (CVSS Base Score: 7.5)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality Impact: None
Integrity Impact: None
Availability Impact: High
The vulnerability can result in denial of service, impacting the availability of affected systems.

Technical Details of CVE-2021-39922

The following details provide insight into the technical aspects of CVE-2021-39922.

Vulnerability Description

The vulnerability involves a buffer overflow in the C12.22 dissector in Wireshark.
It occurs in versions 3.2.0 to 3.2.17 and 3.4.0 to 3.4.9.

Affected Systems and Versions

Vendor: Wireshark Foundation
Product: Wireshark
Affected Versions:
=3.4.0, <3.4.10

=3.2.0, <3.2.18

Exploitation Mechanism

The vulnerability can be exploited through packet injection or by using crafted capture files to trigger the buffer overflow.

Mitigation and Prevention

Taking appropriate steps to mitigate and prevent the exploitation of CVE-2021-39922 is crucial.

Immediate Steps to Take

Update Wireshark to versions 3.4.10 or higher for the 3.4.x branch, and 3.2.18 or above for the 3.2.x branch.
Exercise caution when handling network traffic and files with Wireshark.

Long-Term Security Practices

Regularly update Wireshark and other software to patch known vulnerabilities.
Implement network segmentation and access controls to reduce attack surfaces.

Patching and Updates

Apply security patches promptly to ensure that systems are protected against known vulnerabilities.