CVE-2024-21401: Microsoft Entra Jira SSO Vulnerability

CVE-2024-21401 Overview

CVE-2024-21401 is a critical elevation of privilege vulnerability affecting the Microsoft Entra Jira Single-Sign-On Plugin. This authentication integration component enables SSO capabilities between Microsoft Entra ID (formerly Azure Active Directory) and Atlassian Jira instances. The vulnerability allows unauthenticated remote attackers to gain elevated privileges within affected systems, potentially compromising the integrity of the authentication workflow between enterprise identity providers and Jira deployments.

Critical Impact

Unauthenticated attackers can remotely exploit this vulnerability to elevate privileges without user interaction, potentially gaining administrative access to Jira instances integrated with Microsoft Entra ID.

Affected Products

• Microsoft Entra Jira SSO Plugin (all versions prior to the security patch)

Discovery Timeline

• February 13, 2024 - CVE-2024-21401 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-21401

Vulnerability Analysis

This elevation of privilege vulnerability resides in the Microsoft Entra Jira Single-Sign-On Plugin, which facilitates federated authentication between Microsoft Entra ID and Atlassian Jira instances. The vulnerability is classified under CWE-284 (Improper Access Control), indicating a fundamental flaw in how the plugin enforces authorization boundaries.

The attack can be launched remotely over the network without requiring any authentication or user interaction. Successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected system. An attacker exploiting this vulnerability could potentially manipulate user sessions, impersonate legitimate users, or gain administrative privileges within the Jira environment.

Root Cause

The root cause of CVE-2024-21401 lies in improper access control mechanisms within the Microsoft Entra Jira SSO Plugin. The plugin fails to properly validate authorization during certain operations, allowing attackers to bypass intended privilege restrictions. This access control deficiency enables privilege escalation without proper authentication credentials.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity. An attacker does not require any prior authentication or privileges to exploit this vulnerability. The attack can be executed without any user interaction, making it particularly dangerous in exposed environments. Attackers targeting this vulnerability would likely:

1. Identify Jira instances using the Microsoft Entra SSO Plugin
2. Craft malicious requests targeting the authentication workflow
3. Exploit the improper access control to escalate privileges
4. Gain unauthorized access to protected Jira resources or administrative functions

Detection Methods for CVE-2024-21401

Indicators of Compromise

• Unusual authentication attempts or session creation events in Jira audit logs without corresponding Microsoft Entra ID authentication events
• Unexpected privilege changes for user accounts, particularly escalation to administrative roles
• Anomalous API requests to SSO-related endpoints from external or unexpected IP addresses
• Discrepancies between Microsoft Entra ID sign-in logs and Jira access logs

Detection Strategies

• Monitor Jira access logs for authentication anomalies, particularly sessions established without proper SSO handshake completion
• Implement alerting for privilege escalation events, especially when users gain administrative access unexpectedly
• Deploy web application firewall (WAF) rules to detect and block malformed SSO requests targeting the Entra plugin endpoints
• Correlate Microsoft Entra ID sign-in logs with Jira authentication events to identify unauthorized access attempts

Monitoring Recommendations

• Enable detailed audit logging for all SSO-related activities in both Microsoft Entra ID and Jira
• Configure SIEM rules to alert on authentication patterns indicative of privilege escalation attacks
• Regularly review user privilege assignments in Jira to identify unauthorized changes
• Monitor network traffic to Jira instances for suspicious patterns targeting authentication endpoints

How to Mitigate CVE-2024-21401

Immediate Actions Required

• Update the Microsoft Entra Jira SSO Plugin to the latest patched version immediately
• Review Jira user accounts and privileges for any unauthorized changes that may indicate prior exploitation
• Audit authentication logs for signs of exploitation attempts
• Consider temporarily restricting access to Jira instances until the patch is applied if immediate patching is not possible

Patch Information

Microsoft has released a security update to address this vulnerability. Administrators should apply the latest version of the Microsoft Entra Jira SSO Plugin as soon as possible. Detailed patch information is available in the Microsoft Security Update Guide.

Workarounds

• If immediate patching is not feasible, consider restricting network access to Jira instances to trusted IP ranges only
• Implement additional network-level controls such as VPN requirements for accessing Jira
• Enable multi-factor authentication as an additional layer of defense
• Monitor authentication events closely and investigate any anomalies immediately

# Verify current plugin version in Jira
# Navigate to: Jira Administration > Manage Apps > Microsoft Entra SSO
# Ensure the installed version matches the patched release

# Network-level mitigation example (restrict access to trusted IPs)
# Add firewall rules to limit access to Jira's authentication endpoints
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP_RANGE -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP