CVE-2021-34716 Explained : Impact and Mitigation
Learn about CVE-2021-34716, a security vulnerability in Cisco Expressway Series and TelePresence VCS allowing remote attackers to execute arbitrary code. Take immediate steps for mitigation.
A vulnerability in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute arbitrary code on the underlying operating system as the root user.
Understanding CVE-2021-34716
This CVE refers to a security flaw in Cisco Expressway Series and Cisco TelePresence Video Communication Server that enables a remote attacker to run arbitrary code as the root user.
What is CVE-2021-34716?
CVE-2021-34716 is a vulnerability in the web-based management interface of Cisco devices that permits an authenticated attacker to execute malicious code on the system.
The Impact of CVE-2021-34716
The vulnerability poses a medium severity risk, allowing an attacker to achieve high confidentiality and integrity impacts on the affected systems.
Technical Details of CVE-2021-34716
The vulnerability arises due to mishandling of crafted software images uploaded to the device, enabling code execution as the root user.
Vulnerability Description
A flaw in handling software images allows authenticated attackers to escalate privileges and execute arbitrary code remotely.
Affected Systems and Versions
Cisco TelePresence Video Communication Server (VCS) Expressway is affected by this vulnerability across all versions.
Exploitation Mechanism
Attackers can authenticate as administrative users to upload malicious software images and gain root access on the system.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-34716, users should take immediate actions and adopt long-term security measures.
Immediate Steps to Take
Users are advised to apply vendor patches and updates to address the vulnerability promptly.
Long-Term Security Practices
Implement network segmentation, least privilege access, and regular security assessments to enhance overall system security.
Patching and Updates
Regularly monitor vendor advisories and apply patches released by Cisco to prevent exploitation of this vulnerability.