CVE-2024-37358 in James
Summary
by MITRE • 02/06/2025
Similarly to CVE-2024-34055, Apache James is vulnerable to denial of service through the abuse of IMAP literals from both authenticated and unauthenticated users, which could be used to cause unbounded memory allocation and very long computations
Version 3.7.6 and 3.8.2 restrict such illegitimate use of IMAP literals.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 09/01/2025
The vulnerability identified as CVE-2024-37358 affects Apache James, a widely used open source email server implementation that supports various protocols including IMAP. This issue represents a denial of service vulnerability that specifically targets the IMAP protocol implementation within the email server. The flaw allows attackers to exploit the handling of IMAP literals, which are used in the IMAP protocol to transfer large amounts of data between client and server. The vulnerability is particularly concerning because it can be exploited by both authenticated and unauthenticated users, significantly expanding the potential attack surface. This characteristic aligns with CWE-400, which categorizes issues related to excessive resource consumption, and reflects the broader category of resource exhaustion attacks that can severely impact system availability.
The technical implementation flaw resides in how Apache James processes IMAP literal data structures. When processing IMAP literals, the server fails to properly validate or limit the size and processing time associated with these data elements. This allows malicious actors to send specially crafted IMAP commands containing large literals that trigger unbounded memory allocation patterns within the server process. The vulnerability specifically targets the memory management and computational resources of the IMAP service, causing the server to consume excessive resources over time. The computational overhead can be substantial, with processing times that become increasingly long as the malicious input grows, potentially leading to complete service unavailability. This behavior demonstrates characteristics consistent with the ATT&CK technique T1499.004, which involves resource exhaustion through manipulation of memory allocation processes.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall stability and reliability of email services. When exploited, the vulnerability can cause the affected Apache James server to consume all available memory resources, leading to process crashes, system instability, or complete service outages. The unbounded nature of the memory allocation means that the impact scales directly with the size of the malicious input, making it particularly dangerous in environments where the server handles large volumes of email traffic. Organizations relying on Apache James for their email infrastructure face significant risk of operational disruption, especially during peak usage periods when the server is already under heavy load. The vulnerability also presents challenges for network monitoring and incident response teams, as the symptoms may appear as normal resource consumption patterns before rapidly escalating into full denial of service conditions.
The mitigation strategy for CVE-2024-37358 involves implementing the restrictions that were introduced in Apache James versions 3.7.6 and 3.8.2. These updates specifically address the improper handling of IMAP literals by implementing stricter validation and size limitations for literal data processing. System administrators should immediately upgrade to these patched versions to eliminate the vulnerability. Additionally, network-level protections such as rate limiting and connection throttling can provide additional defense in depth measures to prevent exploitation attempts. Monitoring for unusual memory consumption patterns and extended processing times should be implemented as part of ongoing security operations to detect potential exploitation attempts. Organizations should also consider implementing automated alerts when memory usage exceeds predefined thresholds, as this can serve as an early warning system for potential abuse of this vulnerability. The solution aligns with security best practices for preventing resource exhaustion attacks and demonstrates the importance of proper input validation in protocol implementations, particularly for services that handle user-provided data such as email servers.