CVE-2017-12331 Explained : Impact and Mitigation
Learn about CVE-2017-12331, a vulnerability in Cisco NX-OS System Software allowing attackers to bypass signature verification. Find mitigation steps and affected systems here.
A vulnerability in Cisco NX-OS System Software allows an attacker to bypass signature verification when loading a software patch.
Understanding CVE-2017-12331
What is CVE-2017-12331?
This vulnerability in Cisco NX-OS System Software enables an authenticated, local attacker to override signature verification during software patch installation, potentially leading to the loading of a modified, unverified patch.
The Impact of CVE-2017-12331
The vulnerability allows an attacker with valid administrative login credentials to bypass signature verification and load a crafted, unsigned software patch on affected devices.
Technical Details of CVE-2017-12331
Vulnerability Description
Insufficient verification of signatures in NX-OS software patches allows an attacker to load unauthorized software patches.
Affected Systems and Versions
- Cisco NX-OS System Software
- Multilayer Director Switches
- Nexus 7000 Series Switches
- Nexus 7700 Series Switches
- Unified Computing System Manager
Exploitation Mechanism
- Attacker needs valid administrative login credentials
- Bypasses signature verification to load unauthorized software patches
Mitigation and Prevention
Immediate Steps to Take
- Apply vendor-supplied patches
- Monitor for any unauthorized patch installations
- Restrict access to administrative credentials
Long-Term Security Practices
- Regularly update and patch systems
- Implement strong access controls and authentication mechanisms
Patching and Updates
- Regularly check for and apply security patches provided by the vendor