CVE-2022-45935 in James Server
Summary
by MITRE • 01/09/2023
Usage of temporary files with insecure permissions by the Apache James server allows an attacker with local access to access private user data in transit. Vulnerable components includes the SMTP stack and IMAP APPEND command. This issue affects Apache James server version 3.7.2 and prior versions.
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Analysis
by VulDB Data Team • 04/10/2025
The CVE-2022-45935 vulnerability represents a critical security flaw in the Apache James email server software that stems from improper handling of temporary files during email processing operations. This vulnerability specifically impacts the SMTP stack and IMAP APPEND command functionality, creating a pathway for local attackers to access sensitive user data that is in transit. The issue arises from the server's failure to properly secure temporary file permissions during email processing, which creates a persistent security risk for organizations relying on this email infrastructure. The vulnerability affects all versions of Apache James server up to and including version 3.7.2, making it a widespread concern for deployments that have not yet been updated to newer releases.
The technical root cause of this vulnerability lies in the insecure creation and management of temporary files within the email processing pipeline. When the Apache James server processes email messages through its SMTP stack or handles IMAP APPEND commands, it creates temporary files to store intermediate processing data. These temporary files are created with insufficient permission settings that allow local users to access them, potentially exposing sensitive email content, authentication credentials, or other confidential information. This flaw aligns with CWE-377, which addresses insecure temporary file handling, and represents a classic example of improper privilege management in file system operations. The vulnerability demonstrates how seemingly routine file operations can create significant security exposure points when proper access controls are not implemented.
The operational impact of CVE-2022-45935 extends beyond simple data exposure, as it can enable attackers to intercept and potentially manipulate email communications in transit. Local attackers who can access the system where Apache James is running can leverage this vulnerability to read temporary files containing email data, potentially gaining access to sensitive corporate communications, personal information, or authentication details. This creates a significant risk for organizations that host email services on systems where local access might be compromised, or where multiple users share the same system resources. The vulnerability particularly affects environments where email processing occurs on shared or multi-tenant systems, as it could allow one user to access another user's email data. From an attack perspective, this vulnerability maps to several ATT&CK techniques including privilege escalation and credential access, as the attacker can potentially obtain sensitive information without requiring network-level access or complex attack vectors.
Organizations affected by this vulnerability should immediately implement mitigation strategies to address the insecure temporary file permissions. The most effective immediate solution involves upgrading to Apache James server version 3.7.3 or later, which contains the necessary patches to properly secure temporary file creation and access. System administrators should also conduct thorough audits of their current deployments to identify any instances where temporary files might be created with insecure permissions, particularly in email processing components. Additional mitigations include implementing proper file system access controls, monitoring for unauthorized access to temporary file directories, and ensuring that email processing components run with minimal required privileges. Security teams should also review their incident response procedures to prepare for potential data exposure scenarios that could result from this vulnerability. The remediation process should include comprehensive testing to ensure that the patch does not introduce compatibility issues with existing email processing workflows while maintaining proper security controls for temporary file handling.