CVE-2019-1683 : Security Advisory and Response
Learn about CVE-2019-1683, a vulnerability in Cisco SPA112, SPA525, and SPA5x5 Series IP Phones allowing unauthorized remote attackers to intercept or manipulate encrypted SIP conversations. Find mitigation steps and impacts here.
Cisco SPA112, SPA525, and SPA5x5 Series IP Phones Certificate Validation Vulnerability
Understanding CVE-2019-1683
This CVE involves a security vulnerability in the certificate handling feature of Cisco SPA112, SPA525, and SPA5x5 Series IP Phones, potentially allowing unauthorized remote attackers to intercept or manipulate encrypted SIP conversations.
What is CVE-2019-1683?
The vulnerability arises from inadequate validation of server certificates, enabling attackers to eavesdrop on TLS-encrypted traffic and potentially control certain aspects of SIP conversations.
The Impact of CVE-2019-1683
- CVSS Base Score: 6.5 (Medium Severity)
- Attack Vector: Network
- Confidentiality Impact: High
- Integrity Impact: Low
- Attack Complexity: High
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Availability Impact: None
Technical Details of CVE-2019-1683
The following technical details provide insight into the vulnerability and its implications:
Vulnerability Description
The vulnerability allows attackers to exploit the certificate handling component, leading to potential interception and manipulation of TLS-encrypted SIP conversations.
Affected Systems and Versions
- Cisco Small Business SPA500 Series IP Phones (Version 1.4.2)
- Cisco Small Business SPA112 Series IP Phones (Version 1.4.2)
- Cisco Small Business SPA525 Series IP Phones (Version 7.6.2)
- Cisco Small Business SPA5X5 Series IP Phones (Version 7.6.2)
Exploitation Mechanism
Attackers can create a malicious server certificate and present it to the client, allowing them to eavesdrop on encrypted traffic and potentially control SIP conversations.
Mitigation and Prevention
To address CVE-2019-1683, consider the following mitigation strategies:
Immediate Steps to Take
- Update affected devices to the latest firmware versions.
- Implement network segmentation to limit exposure.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly review and update security policies and procedures.
- Conduct security training for employees to enhance awareness.
- Employ encryption and authentication mechanisms to secure communications.
Patching and Updates
- Apply patches provided by Cisco to address the vulnerability.