CVE-2019-1858 : Security Advisory and Response
Learn about CVE-2019-1858, a vulnerability in Cisco FXOS and NX-OS Software allowing remote attackers to cause system memory leaks via SNMP, potentially leading to denial of service.
Cisco FXOS and NX-OS Software Simple Network Management Protocol Denial of Service Vulnerability
Understanding CVE-2019-1858
This CVE involves a security weakness in the input packet processor of Cisco FXOS Software and Cisco NX-OS Software, specifically related to SNMP, potentially leading to a denial of service (DoS) attack.
What is CVE-2019-1858?
The vulnerability allows an unauthorized remote attacker to manipulate SNMP packets, causing the SNMP application to release system memory, resulting in unexpected restarts of the affected device.
The Impact of CVE-2019-1858
Successful exploitation could lead to a system-wide restart, causing a DoS situation. The flaw arises from inadequate error handling during SNMP packet processing.
Technical Details of CVE-2019-1858
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The vulnerability in SNMP input packet processor of Cisco FXOS and NX-OS Software allows attackers to exploit the system memory leak, leading to device restarts.
Affected Systems and Versions
- Product: Cisco Firepower Extensible Operating System (FXOS)
- Vendor: Cisco
- Versions: Unspecified
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Network
- Availability Impact: High
- Base Score: 8.6 (High)
- Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Mitigation and Prevention
Protecting systems from CVE-2019-1858 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-provided patches promptly
- Monitor network traffic for any suspicious SNMP activities
- Implement network segmentation to limit SNMP exposure
Long-Term Security Practices
- Regularly update and patch all software and firmware
- Conduct security assessments and audits periodically
- Educate users and administrators on SNMP security best practices
Patching and Updates
- Refer to the Cisco Security Advisory for specific patch details
- Stay informed about security updates and advisories from Cisco