CVE-2019-16112 in Eagle
Summary
by MITRE
TylerTech Eagle 2018.3.11 deserializes untrusted user input, resulting in remote code execution via a crafted Java object to the recorder/ServiceManager?service=tyler.empire.settings.SettingManager URI.
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Analysis
by VulDB Data Team • 12/16/2024
The vulnerability identified as CVE-2019-16112 affects TylerTech Eagle version 2018.3.11 and represents a critical deserialization flaw that enables remote code execution. This issue stems from the application's improper handling of untrusted input during the deserialization process, specifically within the recorder/ServiceManager endpoint that accepts the tyler.empire.settings.SettingManager service parameter. The flaw exists in the application's Java-based web service implementation where user-supplied data is directly deserialized without adequate validation or sanitization measures.
The technical exploitation of this vulnerability occurs through the manipulation of Java object serialization streams that are processed by the affected application's service manager component. When a maliciously crafted Java object is sent to the targeted URI, the application's deserialization mechanism automatically processes the object without proper security controls, allowing an attacker to execute arbitrary code on the target system with the privileges of the application service account. This represents a classic deserialization vulnerability that aligns with CWE-502, which specifically addresses unsafe deserialization practices in software applications. The vulnerability is particularly dangerous because it allows for remote code execution without requiring authentication, making it a prime target for automated exploitation campaigns.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it provides attackers with the ability to fully compromise the affected system. Once successful, attackers can establish persistent access, escalate privileges, exfiltrate sensitive data, or deploy additional malicious payloads. The affected TylerTech Eagle application typically runs in enterprise environments where it may have access to sensitive government or organizational data, making the potential impact substantial. The vulnerability affects the application's service manager component that handles settings management, suggesting that successful exploitation could allow attackers to modify system configurations, access restricted data, or disrupt normal operations. This flaw represents a significant security gap that violates fundamental security principles outlined in the OWASP Top Ten and aligns with ATT&CK technique T1059.007 for command and scripting interpreter.
Mitigation strategies for CVE-2019-16112 should focus on immediate patching of the affected TylerTech Eagle application to version 2018.3.12 or later, which contains the necessary security fixes. Organizations should also implement network segmentation to limit access to the affected service endpoints, particularly restricting access to the recorder/ServiceManager URI from untrusted networks. Additional protective measures include implementing web application firewalls to detect and block suspicious deserialization attempts, disabling unnecessary services and endpoints, and conducting thorough security assessments of the application's configuration. Security monitoring should be enhanced to detect unusual patterns in service manager access and deserialization activities, while regular vulnerability scanning should be performed to identify similar issues in other enterprise applications. The remediation process should also include reviewing and updating the application's input validation mechanisms to ensure that all user-supplied data is properly sanitized before processing, addressing the underlying CWE-502 vulnerability category through proper security controls and defensive programming practices.