CVE-2021-3502 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-3502, a vulnerability in Avahi 0.8-5 allowing local attackers to crash the service. Learn about affected systems, exploitation mechanism, and mitigation steps.
A flaw was found in avahi 0.8-5 that allows a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames.
Understanding CVE-2021-3502
This CVE identifies a vulnerability in avahi 0.8-5 that could be exploited by a local attacker to disrupt the avahi service.
What is CVE-2021-3502?
The vulnerability in avahi 0.8-5 involves a reachable assertion in the avahi_s_host_name_resolver_start function, posing a risk to service availability.
The Impact of CVE-2021-3502
The highest threat posed by this vulnerability is to the availability of the avahi service due to crashing caused by invalid hostname resolutions.
Technical Details of CVE-2021-3502
The technical aspects of CVE-2021-3502 provide insight into the vulnerability's description, affected systems, versions, and the exploitation mechanism.
Vulnerability Description
A reachable assertion in the avahi_s_host_name_resolver_start function enables a local attacker to trigger a crash in the avahi service.
Affected Systems and Versions
The avahi version 0.8-5 is impacted by this vulnerability, specifically exposing systems running this version to risk.
Exploitation Mechanism
Local attackers can exploit this vulnerability by requesting hostname resolutions using invalid hostnames through the avahi socket or dbus methods.
Mitigation and Prevention
To address CVE-2021-3502, consider immediate steps and long-term security practices, along with the importance of patching and updates.
Immediate Steps to Take
Take immediate actions to restrict access and monitor avahi service activities to prevent potential exploitation by local attackers.
Long-Term Security Practices
Implement robust security measures, including regular security assessments, network segmentation, and access control, to enhance overall system security.
Patching and Updates
Ensure timely installation of security patches and updates provided by avahi to mitigate the vulnerability and enhance system protection.