CVE-2009-1896 in OpenJDK
Summary
by MITRE
The Java Web Start framework in IcedTea in OpenJDK before 1.6.0.0-20.b16.fc10 on Fedora 10, and before 1.6.0.0-27.b16.fc11 on Fedora 11, trusts an entire application when at least one of the listed jar files is trusted, which allows context-dependent attackers to execute arbitrary code without the untrusted-code restrictions via a crafted application, related to NetX.
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Analysis
by VulDB Data Team • 08/13/2021
The vulnerability described in CVE-2009-1896 resides within the Java Web Start framework implementation in IcedTea as part of OpenJDK versions prior to specific patch releases on Fedora 10 and 11 systems. This flaw represents a critical security weakness in the code signing and trust model that governs how Java applications are executed in web environments. The vulnerability specifically affects the NetX component which handles network-based application execution and relies on trust relationships between signed jar files within an application bundle.
The technical flaw stems from an improper trust validation mechanism where the system grants full trust to an entire application based on the trust status of only a single jar file within that application's deployment. This design oversight creates a scenario where attackers can manipulate a single trusted jar file to bypass the security restrictions that should normally prevent untrusted code execution. The vulnerability exploits the trust model by crafting malicious applications where at least one component is signed and trusted, allowing the entire application to execute with elevated privileges despite containing untrusted code segments.
From an operational perspective, this vulnerability enables context-dependent attackers to execute arbitrary code on affected systems without proper security restrictions. The impact extends beyond simple code execution to potentially allow full system compromise, as the malicious application can leverage the trusted execution context to perform actions that would normally be restricted. Attackers can craft applications that appear legitimate due to the presence of trusted jar files while embedding malicious code that executes with the privileges of the trusted application. This creates a significant risk for users who may unknowingly execute applications that appear safe but contain hidden malicious components.
The vulnerability aligns with CWE-502, which addresses "Deserialization of Untrusted Data" and represents a trust boundary violation where the system incorrectly assumes that if one component is trusted, the entire application should be trusted. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and execution of malicious code through trusted application paths. The attack surface is particularly concerning in enterprise environments where users may execute Java Web Start applications from untrusted sources, and the vulnerability can be exploited through social engineering campaigns that trick users into executing maliciously crafted applications. Organizations should implement immediate patching strategies to address this vulnerability and consider network-level restrictions that prevent execution of unsigned or untrusted Java applications.
Mitigation strategies should include immediate deployment of the patched versions of IcedTea and OpenJDK on affected Fedora systems, along with comprehensive security policies that restrict Java Web Start execution. System administrators should implement strict code signing requirements and regularly audit application trust relationships. The vulnerability demonstrates the critical importance of proper trust validation mechanisms in security frameworks and highlights the need for robust sandboxing and execution restrictions that prevent single points of failure in trust models. Additionally, organizations should consider disabling Java Web Start functionality entirely if not required, and implement network segmentation to limit the potential impact of successful exploitation attempts.