CVE-2017-2349 : Exploit Details and Defense Strategies

A command injection vulnerability in the IDP feature of Juniper Networks Junos OS on SRX series devices allows a user to execute shell commands and gain higher privileges. This CVE affects various versions of Junos OS.

Understanding CVE-2017-2349

The vulnerability enables unauthorized users to execute commands on the device, potentially leading to elevated privileges.

What is CVE-2017-2349?

The IDP feature of Juniper Networks Junos OS on SRX series devices contains a vulnerability that allows users with login access to execute shell commands and gain higher privileges.

The Impact of CVE-2017-2349

CVSS Base Score: 9.9 (Critical)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Scope: Changed
User Interaction: None

Technical Details of CVE-2017-2349

The following details provide insights into the vulnerability.

Vulnerability Description

The vulnerability allows a user with login access to execute shell commands on the device, potentially leading to elevated privileges.

Affected Systems and Versions

The vulnerability affects the following Junos OS versions:

Junos OS 12.1X44 prior to 12.1X44-D60
Junos OS 12.1X46 prior to 12.1X46-D50
Junos OS 12.1X47 prior to 12.1X47-D30, 12.1X47-D35
Junos OS 12.3X48 prior to 12.3X48-D20, 12.3X48-D30
Junos OS 15.1X49 prior to 15.1X49-D20, 15.1X49-D30

Exploitation Mechanism

The vulnerability can be exploited by a user with login access to the device to execute shell commands and potentially gain higher privileges.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2017-2349.

Immediate Steps to Take

Use access lists or firewall filters to limit access to the router's CLI only from trusted hosts.
Restrict access to the CLI to only highly trusted administrators.

Long-Term Security Practices

Regularly monitor and audit user access and activities on the device.
Keep systems up to date with the latest security patches and updates.

Patching and Updates

Ensure that the following software releases have been updated to resolve the issue:

12.1X44-D60
12.1X47-D30, 12.1X47-D35
12.3X48-D20, 12.3X48-D30
15.1X49-D20, 15.1X49-D30
12.1X46-D50, and all subsequent releases.

The vulnerability is being tracked as PR 1091623 and is visible on the Customer Support website.