CVE-2017-12628 in James
Summary
by MITRE
The JMX server embedded in Apache James, also used by the command line client is exposed to a java de-serialization issue, and thus can be used to execute arbitrary commands. As James exposes JMX socket by default only on local-host, this vulnerability can only be used for privilege escalation. Release 3.0.1 upgrades the incriminated library.
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Analysis
by VulDB Data Team • 01/19/2021
The vulnerability identified as CVE-2017-12628 represents a critical security flaw within the Apache James email server implementation that leverages Java deserialization vulnerabilities in its embedded JMX (Java Management Extensions) server. This issue specifically affects the command line client component of Apache James, which incorporates an embedded JMX server that is enabled by default. The JMX server serves as a management interface for monitoring and managing Java applications, but in this case it becomes a vector for remote code execution through improper handling of serialized Java objects. The flaw stems from the use of a vulnerable library that processes serialized data without adequate validation, creating an opportunity for malicious actors to inject and execute arbitrary commands on the target system.
The technical exploitation of this vulnerability requires understanding the Java serialization mechanism and how it can be manipulated to achieve remote code execution. When the JMX server receives serialized data, it attempts to deserialize the objects without proper security checks, allowing attackers to craft malicious serialized payloads that execute arbitrary code when processed. This deserialization flaw falls under the category of CWE-502, which specifically addresses "Deserialization of Untrusted Data" as a critical security weakness. The vulnerability's impact is particularly concerning because it allows for privilege escalation, as the JMX server is configured to listen only on the local host interface by default, meaning that exploitation would require an attacker to first gain access to the local system through other means before leveraging this vulnerability to elevate privileges.
The operational impact of CVE-2017-12628 extends beyond simple remote code execution, as it creates a pathway for attackers to gain deeper system access and potentially compromise the entire email server infrastructure. Since Apache James is commonly used in enterprise email environments, this vulnerability could enable attackers to access sensitive email communications, manipulate email configurations, or establish persistent access points within the network. The default local-only binding of the JMX server provides some defense-in-depth, but it does not prevent local privilege escalation attacks from succeeding once an attacker has already compromised the system. This vulnerability also highlights the importance of proper library management and regular security updates, as the issue was resolved in Apache James release 3.0.1 through the upgrade of the affected library component.
Security practitioners should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the techniques related to privilege escalation and command execution. The vulnerability demonstrates how embedded management interfaces can become attack vectors when not properly secured, and it underscores the need for comprehensive security assessments of all components within software systems. Organizations running Apache James should prioritize immediate patching to version 3.0.1 or later, while also implementing network segmentation and monitoring to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of keeping all third-party libraries updated and conducting regular security audits of embedded systems to prevent similar issues from arising in other components of the software stack.