CVE-2018-0309 : Exploit Details and Defense Strategies
Learn about CVE-2018-0309, a vulnerability in Cisco Nexus 3000 and 9000 switches allowing memory exhaustion by executing specific commands. Find mitigation steps and preventive measures.
A vulnerability in the implementation of a specific CLI command and the associated Simple Network Management Protocol (SNMP) MIB for Cisco NX-OS on Nexus 3000 and 9000 Series Switches could allow an authenticated remote attacker to exhaust system memory, leading to a denial of service situation.
Understanding CVE-2018-0309
This CVE involves a flaw in a particular command and SNMP MIB implementation on Cisco Nexus switches, potentially resulting in a denial of service due to excessive memory consumption.
What is CVE-2018-0309?
The vulnerability arises from an incorrect implementation of a command in Cisco NX-OS, failing to release allocated memory properly, allowing an attacker to consume excessive system memory by executing the specific command or sending a specific SNMP poll request.
The Impact of CVE-2018-0309
Exploiting this vulnerability could lead to a denial of service situation by causing the IP routing process to restart or the device to reset, affecting the availability of the device.
Technical Details of CVE-2018-0309
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The flaw in the CLI command and SNMP MIB implementation on Cisco Nexus switches allows an authenticated remote attacker to exhaust system memory, potentially leading to a denial of service.
Affected Systems and Versions
- Product: Cisco Nexus 3000 and 9000 unknown
- Versions: Cisco Nexus 3000 and 9000 unknown
Exploitation Mechanism
- Attacker needs authentication to the device
- Execution of specific command or SNMP poll request
- Failure to release allocated memory properly
Mitigation and Prevention
Protective measures and steps to mitigate the impact of CVE-2018-0309.
Immediate Steps to Take
- Apply vendor-supplied patches or updates promptly
- Monitor system memory usage for anomalies
- Restrict network access to authorized personnel
Long-Term Security Practices
- Regularly update and patch network devices
- Implement strong authentication mechanisms
- Conduct security training for staff members
Patching and Updates
- Check vendor advisories for patches and updates
- Apply recommended security configurations
- Perform regular security audits and assessments