CVE-2021-45952 : Vulnerability Insights and Analysis
Learn about the CVE-2021-45952 involving a heap-based buffer overflow in Dnsmasq 2.86, potentially allowing attackers to execute arbitrary code or cause denial of service. Find mitigation steps and prevention measures.
Dnsmasq 2.86 has a heap-based buffer overflow in dhcp_reply function that could allow attackers to execute arbitrary code or cause a denial of service.
Understanding CVE-2021-45952
This CVE involves a heap-based buffer overflow vulnerability in Dnsmasq 2.86.
What is CVE-2021-45952?
The vulnerability occurs in the dhcp_reply function of Dnsmasq 2.86, triggered from dhcp_packet and FuzzDhcp, potentially leading to code execution or denial of service.
The Impact of CVE-2021-45952
The exploit could allow an attacker to execute arbitrary code or cause a denial of service on the affected system.
Technical Details of CVE-2021-45952
This section provides technical details of the CVE.
Vulnerability Description
The vulnerability is a heap-based buffer overflow in the dhcp_reply function of Dnsmasq 2.86.
Affected Systems and Versions
- Product: n/a
- Vendor: n/a
- Version: n/a
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted packets to a vulnerable Dnsmasq instance, triggering the overflow.
Mitigation and Prevention
Steps to address and prevent exploitation of CVE-2021-45952.
Immediate Steps to Take
- Update Dnsmasq to a non-vulnerable version.
- Implement network security controls to filter out malicious packets.
Long-Term Security Practices
- Regular software updates and patch management.
- Conduct security audits and penetration testing to identify vulnerabilities.
Patching and Updates
- Apply patches provided by Dnsmasq promptly to fix the vulnerability.