CVE-2021-1375 : What You Need to Know

Cisco IOS XE Software running on Cisco Catalyst switches is affected by multiple vulnerabilities in the fast reload feature. These vulnerabilities could allow a local attacker to execute arbitrary code, install malicious software, or run unsigned binaries on the device.

Understanding CVE-2021-1375

This CVE involves vulnerabilities in the fast reload feature of Cisco IOS XE Software that could be exploited by an authenticated, local attacker. The impact includes executing arbitrary code on the operating system.

What is CVE-2021-1375?

The vulnerabilities in the fast reload feature of Cisco IOS XE Software allow an attacker to execute arbitrary code, install and boot malicious software, or run unsigned code on the affected devices with privileged access to the CLI.

The Impact of CVE-2021-1375

The vulnerabilities have a CVSS base score of 6.7, with high impacts on confidentiality, integrity, and availability. An attacker could execute arbitrary code on the underlying operating system or bypass image verification checks during the secure boot process.

Technical Details of CVE-2021-1375

This section provides details on the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerabilities are a result of improper checks conducted by system boot routines, enabling attackers to execute arbitrary code and install malicious software.

Affected Systems and Versions

Cisco IOS XE Software on Cisco Catalyst 3850, Cisco Catalyst 9300, and Cisco Catalyst 9300L Series Switches is affected by these vulnerabilities.

Exploitation Mechanism

To exploit these vulnerabilities, the attacker needs privileged access to the CLI. Successful exploitation can result in executing arbitrary code on the underlying OS or running unsigned binaries.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-1375, immediate steps can be taken along with adopting long-term security practices and ensuring timely patching and updates.

Immediate Steps to Take

Ensure access controls are in place, restrict user privileges, and monitor network traffic for any suspicious activities.

Long-Term Security Practices

Implement regular security training, conduct vulnerability assessments, and keep systems up-to-date with the latest security patches.

Patching and Updates

Install patches released by Cisco to address the vulnerabilities and maintain a proactive approach towards security.