CVE-2017-2342 : Vulnerability Insights and Analysis

Juniper Networks Junos OS on SRX300 series devices prior to version 15.1X49-D100 has a vulnerability where the MACsec feature fails to report errors, potentially misleading users about the security of their connections.

Understanding CVE-2017-2342

This CVE involves a security issue in Juniper Networks Junos OS that affects the MACsec feature on SRX300 series devices.

What is CVE-2017-2342?

The MACsec feature on Juniper Networks Junos OS 15.1X49 versions earlier than 15.1X49-D100 on SRX300 series devices does not provide error notifications when a secure connection cannot be established. Instead, it automatically switches to an unencrypted link, potentially giving users a false sense of security.

The Impact of CVE-2017-2342

CVSS Base Score: 8.1 (High Severity)
Attack Vector: Adjacent Network
Confidentiality Impact: High
Integrity Impact: High
This vulnerability could allow an attacker to intercept sensitive information due to the lack of error reporting in MACsec.

Technical Details of CVE-2017-2342

This section provides more technical insights into the vulnerability.

Vulnerability Description

The MACsec feature on Juniper Networks Junos OS 15.1X49 versions earlier than 15.1X49-D100 on SRX300 series devices fails to report errors when a secure connection cannot be established, potentially leading to unencrypted links.

Affected Systems and Versions

Affected Platforms: SRX300 series
Affected Product: Junos OS
Vulnerable Versions: 15.1X49 prior to 15.1X49-D100

Exploitation Mechanism

Attack Complexity: Low
Privileges Required: None
User Interaction: None
The vulnerability can be exploited from an adjacent network without the need for user interaction.

Mitigation and Prevention

Protecting systems from CVE-2017-2342 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to version 15.1X49-D100 or later to mitigate the vulnerability.
Monitor network traffic for any signs of unauthorized access.

Long-Term Security Practices

Implement access controls and firewall filters to restrict access to critical infrastructure devices.
Regularly review and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Apply software releases 15.1X49-D100 and newer to address the MACsec error reporting issue.