CVE-2023-0093: Okta Advanced Server Access RCE Flaw

CVE-2023-0093 Overview

A command injection vulnerability exists in Okta Advanced Server Access (ASA) Client versions 1.13.1 through 1.65.0 due to an outdated third-party library called webbrowser. This vulnerability allows attackers to execute arbitrary commands on the target system by exploiting improper input handling within the webbrowser library. Successful exploitation requires social engineering, specifically phishing the user to enter an attacker-controlled server URL during the client enrollment process.

Critical Impact

Attackers can achieve arbitrary command execution on systems running vulnerable versions of the Okta ASA Client, potentially leading to complete system compromise, credential theft, and lateral movement within enterprise environments.

Affected Products

• Okta Advanced Server Access Client version 1.13.1 through 1.65.0
• All platforms running the affected ASA Client versions
• Enterprise environments using Okta ASA for privileged access management

Discovery Timeline

• 2023-03-06 - CVE-2023-0093 published to NVD
• 2025-03-06 - Last updated in NVD database

Technical Details for CVE-2023-0093

Vulnerability Analysis

This vulnerability is classified as CWE-77 (Improper Neutralization of Special Elements used in a Command), commonly known as Command Injection. The root cause lies in the Okta ASA Client's use of the webbrowser Python library, which contains improper input sanitization when handling URLs. When a user is tricked into entering a malicious server URL during the enrollment process, the attacker-controlled input can escape the intended context and execute arbitrary system commands.

The attack requires user interaction, specifically through a phishing campaign where the victim is convinced to enroll their ASA client against a malicious server URL. Once the user submits the crafted URL, the vulnerable webbrowser library processes it without adequate sanitization, allowing command injection payloads to be executed with the privileges of the user running the ASA client.

Root Cause

The vulnerability stems from the use of an outdated version of the webbrowser third-party library within the Okta ASA Client. This library failed to properly sanitize URL inputs before passing them to system shell commands. When specially crafted URLs containing shell metacharacters or command sequences are processed, they can break out of the intended URL context and execute arbitrary commands on the underlying operating system.

Attack Vector

The attack vector involves network-based exploitation that requires user interaction. An attacker must first set up a malicious server and craft a phishing campaign to trick users into entering the attacker-controlled URL during the Okta ASA Client enrollment process. The attack chain typically follows this sequence:

1. Attacker establishes a malicious server endpoint
2. Attacker crafts a phishing email or message targeting Okta ASA Client users
3. Victim is tricked into initiating enrollment with the malicious server URL
4. The vulnerable webbrowser library processes the crafted URL
5. Command injection payload executes with user privileges

The vulnerability does not require prior authentication, but does require the user to manually input the malicious URL, making social engineering a critical component of successful exploitation.

Detection Methods for CVE-2023-0093

Indicators of Compromise

• Unusual command execution originating from the Okta ASA Client process
• Suspicious network connections to unknown or untrusted server URLs during ASA enrollment
• Unexpected child processes spawned by the ASA Client application
• Log entries showing enrollment attempts to non-corporate or suspicious server addresses

Detection Strategies

• Monitor for anomalous process creation events where the parent process is the Okta ASA Client
• Implement network monitoring to detect enrollment traffic to unauthorized server endpoints
• Deploy endpoint detection rules to identify command injection patterns in URL parameters
• Review ASA Client logs for enrollment attempts to non-whitelisted server URLs

Monitoring Recommendations

• Enable detailed logging for Okta ASA Client activities across all managed endpoints
• Configure SIEM alerting for unusual URL patterns in ASA enrollment events
• Establish baseline behavior for ASA Client processes and alert on deviations
• Monitor for phishing indicators targeting your organization's Okta ASA users

How to Mitigate CVE-2023-0093

Immediate Actions Required

• Upgrade Okta Advanced Server Access Client to version 1.66.0 or later immediately
• Audit all systems for vulnerable ASA Client versions (1.13.1 through 1.65.0)
• Alert end users about phishing attempts targeting the ASA enrollment process
• Implement URL whitelisting for ASA enrollment to prevent connections to unauthorized servers

Patch Information

Okta has addressed this vulnerability in Okta Advanced Server Access Client version 1.66.0 and later. Organizations should immediately update all deployed ASA Clients to the latest available version. The security advisory is available from the Okta Security Advisory for CVE-2023-0093.

Workarounds

• Restrict ASA enrollment to only allow connections to pre-approved corporate server URLs
• Implement network-level controls to block enrollment traffic to unknown destinations
• Educate users to verify server URLs through official channels before enrollment
• Deploy endpoint protection that can detect and block command injection attempts

# Verify Okta ASA Client version on endpoints
# For Windows (PowerShell):
# Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | Where-Object {$_.DisplayName -like "*Okta*ASA*"} | Select-Object DisplayName, DisplayVersion

# For macOS/Linux:
# sft version
# Ensure version is 1.66.0 or later to remediate CVE-2023-0093