CVE-2021-1258 : Security Advisory and Response

A vulnerability in the upgrade component of Cisco AnyConnect Secure Mobility Client allows an authenticated, local attacker to read arbitrary files on the underlying operating system of an affected device due to insufficient file permission restrictions.

Understanding CVE-2021-1258

This vulnerability affects Cisco AnyConnect Secure Mobility Client, potentially leading to unauthorized file access on the host device.

What is CVE-2021-1258?

The vulnerability in Cisco AnyConnect Secure Mobility Client enables a local attacker with low privileges to read arbitrary files on the device's OS, requiring valid user credentials to exploit.

The Impact of CVE-2021-1258

If successfully exploited, the vulnerability allows the attacker to access sensitive information stored on the affected device.

Technical Details of CVE-2021-1258

The following technical details outline the vulnerability.

Vulnerability Description

The flaw allows a local attacker to read arbitrary files on the underlying OS of an affected device via a crafted command to the application.

Affected Systems and Versions

Product: Cisco AnyConnect Secure Mobility Client
Vendor: Cisco
Version: n/a

Exploitation Mechanism

An attacker can exploit the vulnerability by sending a specific command from the local CLI to the application, leading to unauthorized file access.

Mitigation and Prevention

To safeguard systems from CVE-2021-1258, consider the following measures.

Immediate Steps to Take

Ensure user credentials and access rights are strictly managed to prevent unauthorized access.
Monitor and restrict local CLI commands to prevent exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch the Cisco AnyConnect Secure Mobility Client to mitigate known vulnerabilities.

Patching and Updates

Stay informed about security advisories from Cisco and promptly apply recommended patches to secure your systems.