CVE-2021-34711 Explained : Impact and Mitigation
Learn about CVE-2021-34711, a vulnerability in Cisco IP Phone software allowing local attackers to read any file on the device file system. Find mitigation steps here.
A vulnerability in the debug shell of Cisco IP Phone software could allow an authenticated, local attacker to read any file on the device file system.
Understanding CVE-2021-34711
This CVE identifies a security flaw in the debug shell of Cisco IP Phone software that enables a local, authenticated attacker to access any file on the device's file system.
What is CVE-2021-34711?
CVE-2021-34711 is a vulnerability in Cisco IP Phones with Multiplatform Firmware that permits a local attacker to read arbitrary files on the device by exploiting insufficient input validation in the debug shell.
The Impact of CVE-2021-34711
The impact of this vulnerability is rated as medium severity with high confidentiality impact, allowing the attacker to access sensitive information stored on the device.
Technical Details of CVE-2021-34711
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in the debug shell of Cisco IP Phone software arises from inadequate input validation, enabling attackers to read any file on the device's file system.
Affected Systems and Versions
The affected product is Cisco IP Phones with Multiplatform Firmware, with all versions being susceptible to exploitation.
Exploitation Mechanism
An authenticated attacker exploits the vulnerability by providing crafted input to a debug shell command, granting them unauthorized access to read files on the device.
Mitigation and Prevention
Discover the steps to mitigate the risks associated with CVE-2021-34711.
Immediate Steps to Take
Immediately restrict access to the debug shell and review file permissions to limit unauthorized access to critical files.
Long-Term Security Practices
It is advisable to conduct regular security audits, enforce strong access controls, and maintain updated security patches and firmware to prevent future incidents.
Patching and Updates
Stay informed about security updates from Cisco and promptly apply patches to address this vulnerability and enhance the overall security posture of Cisco IP Phones.