CVE-2021-34715 : What You Need to Know
Learn about CVE-2021-34715, a flaw in Cisco Expressway & TelePresence VCS allowing remote code execution. Find mitigation steps and impact details here.
A vulnerability in the image verification function of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute code with internal user privileges on the underlying operating system.
Understanding CVE-2021-34715
This CVE involves a security flaw in the image verification process of Cisco Expressway Series and Cisco TelePresence VCS that could enable a remote attacker to run malicious code with user-level privileges.
What is CVE-2021-34715?
The vulnerability stems from inadequate validation of upgrade package content, which could be exploited by uploading a malicious archive to the administrative web interface Upgrade page.
The Impact of CVE-2021-34715
Successful exploitation of this vulnerability could lead to the execution of code with user-level privileges on the underlying operating system, specifically the _nobody account.
Technical Details of CVE-2021-34715
This section delves into the specifics of the vulnerability.
Vulnerability Description
The vulnerability in Cisco Expressway Series and TelePresence VCS arises due to insufficient validation of upgrade package content, allowing attackers to upload malicious archives to execute code.
Affected Systems and Versions
The affected product is the Cisco TelePresence Video Communication Server (VCS) Expressway, with all versions being susceptible to this image verification vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by uploading a malicious archive to the administrative web interface's Upgrade page, hence executing code with user-level privileges.
Mitigation and Prevention
Protective measures to address and prevent CVE-2021-34715.
Immediate Steps to Take
Ensure timely patching and software updates to mitigate the risk of exploitation. Implement network security measures while monitoring for any unusual activities.
Long-Term Security Practices
Regular security assessments, employee training on cyber hygiene, and maintaining updated security protocols can enhance long-term system security.
Patching and Updates
Frequently check for security advisories and patches released by Cisco to address vulnerabilities and enhance system security.