CVE-2021-39128 in JIRA Server
Summary
by MITRE • 09/16/2021
Affected versions of Atlassian Jira Server or Data Center using the Jira Service Management addon allow remote attackers with JIRA Administrators access to execute arbitrary Java code via a server-side template injection vulnerability in the Email Template feature. The affected versions of Jira Server or Data Center are before version 8.13.12, and from version 8.14.0 before 8.19.1.
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Analysis
by VulDB Data Team • 10/11/2024
This vulnerability represents a critical server-side template injection flaw in Atlassian Jira Server and Data Center platforms that has significant implications for enterprise security infrastructure. The vulnerability specifically affects installations using the Jira Service Management addon and allows remote attackers who have already gained administrator-level access to execute arbitrary Java code on the affected systems. This represents a severe privilege escalation scenario where attackers can leverage their existing administrative credentials to achieve full system compromise through code execution. The flaw exists within the Email Template feature, which is a core component of Jira's service management capabilities and is frequently used for automated notifications and communication workflows.
The technical nature of this vulnerability aligns with CWE-74 and CWE-94, which describe improper neutralization of special elements used in object references and code injection respectively. The vulnerability operates by manipulating template variables that are processed server-side without proper input sanitization, allowing attackers to inject malicious Java code that gets executed within the application context. This type of attack vector is particularly dangerous because it bypasses traditional security controls and operates within the legitimate application execution environment, making detection more challenging. The attack requires only JIRA Administrator access, which is often a high-privilege account that may have broader system access than typical user accounts.
From an operational impact perspective, this vulnerability can lead to complete system compromise and data exfiltration. Attackers can use the arbitrary code execution capability to establish persistent backdoors, escalate privileges further, access sensitive data repositories, and potentially move laterally within the network infrastructure. The affected version range spans from before 8.13.12 through versions 8.14.0 to 8.19.0, indicating this vulnerability has existed for an extended period and likely affected numerous organizations that had not yet applied security updates. The impact extends beyond immediate system compromise to include potential regulatory compliance violations, financial losses, and reputational damage that can result from successful exploitation of such critical vulnerabilities.
Organizations should implement immediate mitigation strategies including applying the vendor-provided security patches for versions 8.13.12 and 8.19.1, which address this specific vulnerability through proper input validation and sanitization of template variables. Network segmentation and access control measures should be enforced to limit the scope of potential compromise, ensuring that JIRA administrator accounts are protected through multi-factor authentication and least privilege principles. Monitoring systems should be enhanced to detect unusual patterns in email template usage and code execution activities. The vulnerability also highlights the importance of maintaining current security patches and implementing robust application security practices including regular vulnerability assessments, secure coding reviews, and comprehensive incident response procedures. Additionally, organizations should consider implementing web application firewalls and runtime application self-protection measures to provide additional layers of defense against similar exploitation techniques that may target other components of their Jira infrastructure.