CVE-2021-1306 Explained : Impact and Mitigation
Discover the impact of CVE-2021-1306 where a local attacker could write files on affected Cisco devices. Learn mitigation steps and preventive measures here.
A vulnerability in the restricted shell of Cisco Evolved Programmable Network (EPN) Manager, Cisco Identity Services Engine (ISE), and Cisco Prime Infrastructure could allow an authenticated, local attacker to identify directories and write arbitrary files to the file system.
Understanding CVE-2021-1306
This CVE, published on May 19, 2021, exposes a security flaw in Cisco products that enables a local attacker to manipulate certain CLI commands.
What is CVE-2021-1306?
The vulnerability arises due to improper validation of parameters within the restricted shell of Cisco products. An authenticated attacker can exploit this by executing specific CLI commands, leading to unauthorized directory access and file writes.
The Impact of CVE-2021-1306
With a CVSS base score of 4.4 (Medium Severity), this exploit allows attackers to compromise file system integrity. However, there have been no reported public exploits or malicious activities involving the vulnerability.
Technical Details of CVE-2021-1306
This section delves into the specifics of the vulnerability.
Vulnerability Description
The flaw allows an authenticated local attacker to traverse directories and write arbitrary files on affected devices.
Affected Systems and Versions
Cisco Identity Services Engine Software is among the affected products where all versions are vulnerable.
Exploitation Mechanism
By leveraging this vulnerability, an attacker can access file directories and write arbitrary files on the affected device by issuing malicious CLI commands.
Mitigation and Prevention
Here are some measures to address and prevent this vulnerability.
Immediate Steps to Take
Ensure user shell access is restricted and monitor for any unauthorized file system modifications.
Long-Term Security Practices
Regularly update Cisco products and implement security best practices to minimize the risk of unauthorized access.
Patching and Updates
Keep systems up to date with the latest patches and security fixes provided by Cisco.