CVE-2021-31352 : Vulnerability Insights and Analysis

An Information Exposure vulnerability in Juniper Networks SRC Series devices configured for NETCONF over SSH permits the negotiation of weak ciphers, potentially allowing a remote attacker to access sensitive information. This affects all Juniper Networks SRC Series versions prior to 4.13.0-R6.

Understanding CVE-2021-31352

This CVE identifies an issue in Juniper Networks SRC Series devices that enables the negotiation of weak ciphers in NETCONF over SSH, leading to potential information exposure.

What is CVE-2021-31352?

The vulnerability in CVE-2021-31352 allows a remote attacker to exploit weak ciphers in the NETCONF over SSH configuration of Juniper Networks SRC Series devices, potentially revealing sensitive data.

The Impact of CVE-2021-31352

The impact of this vulnerability is rated as medium, with a CVSS base score of 5.3. A successful exploit could allow unauthorized access to plaintext bits from ciphertext, compromising data confidentiality.

Technical Details of CVE-2021-31352

This section will provide more insights into the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The CVE-2021-31352 vulnerability allows remote attackers to negotiate weak ciphers in the NETCONF over SSH configuration, potentially leading to the disclosure of sensitive information.

Affected Systems and Versions

All Juniper Networks SRC Series versions prior to 4.13.0-R6 are vulnerable to CVE-2021-31352, impacting devices configured for NETCONF over SSH.

Exploitation Mechanism

Exploiting this vulnerability requires a remote attacker to have read and write access to network data and the ability to negotiate weak ciphers in the NETCONF over SSH setup.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-31352, users are recommended to take immediate steps and adopt long-term security practices.

Immediate Steps to Take

Juniper Networks has released a hotfix to address this vulnerability. Users should contact Juniper Networks Technical Support to request the hotfix. Weak ciphers are disabled by default in the fixed version, enhancing security.

Long-Term Security Practices

After upgrading to a fixed release, administrators should reset the cipher configuration by following specific steps. It is crucial to maintain updated configurations and regularly monitor security advisories.

Patching and Updates

Regularly apply patches and updates from Juniper Networks to ensure that weak ciphers are disabled by default and to enhance the overall security posture of the affected systems.