CVE-2009-3884 in OpenJDK
Summary
by MITRE
The TimeZone.getTimeZone method in Sun Java SE 5.0 before Update 22 and 6 before Update 17, and OpenJDK, allows remote attackers to determine the existence of local files via vectors related to handling of zoneinfo (aka tz) files, aka Bug Id 6824265.
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Analysis
by VulDB Data Team • 08/27/2021
The vulnerability described in CVE-2009-3884 represents a significant information disclosure flaw within the Java runtime environment that affects multiple versions of Sun Java SE and OpenJDK implementations. This security issue stems from improper handling of timezone data files during the execution of the getTimeZone method, creating a pathway for remote attackers to infer the existence of local files on the target system. The vulnerability specifically impacts Java versions prior to Update 22 for Java SE 5.0 and Update 17 for Java SE 6, with OpenJDK also affected by the same flaw. The underlying mechanism involves the zoneinfo (tz) file processing logic that fails to properly validate or sanitize input parameters when resolving timezone information, leading to unintended information leakage.
The technical exploitation of this vulnerability occurs through the manipulation of timezone identifiers that reference local file paths within the zoneinfo database structure. When the getTimeZone method processes certain timezone strings, it inadvertently triggers file system operations that reveal whether specific local files exist on the system. Attackers can leverage this behavior to perform reconnaissance activities by systematically testing various timezone identifiers that map to different file paths, thereby constructing a profile of the target system's file structure without direct access to the files themselves. This type of information disclosure can serve as a foundation for more sophisticated attacks by providing attackers with knowledge of the system's internal organization and potentially sensitive file locations.
The operational impact of CVE-2009-3884 extends beyond simple information leakage, as it can facilitate more advanced attack vectors within the broader context of the attack lifecycle. From an ATT&CK framework perspective, this vulnerability enables initial access and reconnaissance activities by allowing adversaries to gather system intelligence without direct exploitation of other vulnerabilities. The flaw aligns with CWE-200 (Information Exposure) and represents a classic example of how seemingly benign functionality can be abused for security reconnaissance. Organizations running affected Java versions face increased risk of targeted attacks where attackers can use the information gathered through this vulnerability to plan more precise exploitation attempts against other system components.
Security mitigations for this vulnerability primarily involve applying the respective vendor patches and updates that address the timezone handling logic in the Java runtime environment. Oracle released updates for Java SE 5.0 Update 22 and Java SE 6 Update 17 that corrected the zoneinfo file processing behavior to prevent the unintended file system exposure. Organizations should also consider implementing network segmentation and access controls to limit exposure of Java applications to untrusted networks. Additionally, security monitoring should include detection of unusual timezone-related API calls that might indicate exploitation attempts, and regular vulnerability assessments should verify that all Java installations have been properly updated to address this information disclosure vulnerability. The remediation process must account for the potential impact on existing applications that might rely on the vulnerable timezone handling behavior, requiring careful testing and validation of updated Java environments.