CVE-2019-20892 : Vulnerability Insights and Analysis
Learn about CVE-2019-20892, a vulnerability in Net-SNMP before 5.8.1.pre1, allowing for a double free issue via an SNMPv3 GetBulk request. Find mitigation steps and affected systems here.
Net-SNMP before 5.8.1.pre1 is vulnerable to a double free issue in the function usm_free_usmStateReference, triggered by an SNMPv3 GetBulk request. This vulnerability affects various Linux distributions' packages.
Understanding CVE-2019-20892
This CVE involves a specific vulnerability in the Net-SNMP software.
What is CVE-2019-20892?
CVE-2019-20892 is a security vulnerability in Net-SNMP versions prior to 5.8.1.pre1, leading to a double free issue in the usm_free_usmStateReference function.
The Impact of CVE-2019-20892
The vulnerability can be exploited through an SNMPv3 GetBulk request, potentially allowing attackers to execute arbitrary code or cause a denial of service.
Technical Details of CVE-2019-20892
This section covers the technical aspects of the CVE.
Vulnerability Description
The vulnerability in Net-SNMP before 5.8.1.pre1 results in a double free in the usm_free_usmStateReference function.
Affected Systems and Versions
- Versions of Net-SNMP prior to 5.8.1.pre1
- Linux distributions' packages distributed to end users
Exploitation Mechanism
The vulnerability is exploited through an SNMPv3 GetBulk request.
Mitigation and Prevention
Protecting systems from CVE-2019-20892 is crucial.
Immediate Steps to Take
- Update Net-SNMP to version 5.8.1.pre1 or later
- Monitor vendor advisories for patches
Long-Term Security Practices
- Regularly update software and apply security patches
- Implement network segmentation and access controls
Patching and Updates
- Apply patches provided by Net-SNMP or respective Linux distributions