CVE-2017-12328 : Security Advisory and Response
Learn about CVE-2017-12328, a vulnerability in Cisco IP Phone 8800 Series devices allowing remote attackers to disrupt services via SIP call handling. Find mitigation steps here.
Cisco IP Phone 8800 Series devices are susceptible to a vulnerability in the Session Initiation Protocol (SIP) call handling, potentially leading to a denial of service (DoS) scenario.
Understanding CVE-2017-12328
This CVE entry highlights a weakness in SIP call management on Cisco IP Phone 8800 Series devices, allowing remote unauthorized individuals to disrupt services.
What is CVE-2017-12328?
The vulnerability stems from inadequate validation of SIP packet header information, enabling attackers to send malformed SIP packets and trigger unexpected restarts of the SIP process, leading to DoS incidents.
The Impact of CVE-2017-12328
- Unauthorized remote attackers can exploit the vulnerability to disrupt SIP services on Cisco IP Phone 8800 Series devices, causing ongoing calls to terminate abruptly.
- The vulnerability, if successfully exploited, results in a DoS situation where the SIP process restarts unexpectedly, affecting all active phone calls.
Technical Details of CVE-2017-12328
This section delves into the specifics of the vulnerability affecting Cisco IP Phone 8800 Series devices.
Vulnerability Description
The vulnerability in SIP call handling lacks sufficient validation for SIP packet header information, allowing attackers to disrupt services by sending malformed SIP packets.
Affected Systems and Versions
- Product: Cisco IP Phone 8800 Series
- Version: Cisco IP Phone 8800 Series
Exploitation Mechanism
- Attackers exploit the vulnerability by sending purposely malformed SIP packets to targeted phones, triggering unexpected restarts of the SIP process and causing DoS scenarios.
Mitigation and Prevention
To address CVE-2017-12328 and enhance security measures, consider the following steps:
Immediate Steps to Take
- Apply patches and updates provided by Cisco to mitigate the vulnerability.
- Implement network segmentation to limit exposure to potential attackers.
Long-Term Security Practices
- Regularly monitor and update security configurations on Cisco IP Phone 8800 Series devices.
- Conduct security training for users to recognize and report suspicious activities.
Patching and Updates
- Stay informed about security advisories from Cisco and promptly apply recommended patches to address vulnerabilities.