CVE-2007-4219 in ServerProtect
Summary
by MITRE
Integer overflow in the RPCFN_SYNC_TASK function in StRpcSrv.dll, as used by the ServerProtect service (SpntSvc.exe), in Trend Micro ServerProtect for Windows before 5.58 Security Patch 4 allows remote attackers to execute arbitrary code via a certain integer field in a request packet to TCP port 5168, which triggers a heap-based buffer overflow.
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Analysis
by VulDB Data Team • 11/27/2024
The vulnerability identified as CVE-2007-4219 represents a critical integer overflow flaw within the StRpcSrv.dll component of Trend Micro ServerProtect for Windows versions prior to 5.58 Security Patch 4. This vulnerability specifically affects the RPCFN_SYNC_TASK function which handles remote procedure calls within the ServerProtect service architecture. The flaw exists in the processing of integer fields within request packets transmitted to TCP port 5168, which serves as the primary communication port for the ServerProtect service. The issue manifests when the application fails to properly validate integer values during packet processing, leading to an arithmetic overflow condition that can be exploited by remote attackers to manipulate memory allocation behavior.
The technical exploitation of this vulnerability leverages a heap-based buffer overflow condition that occurs when the integer overflow triggers improper memory calculations during the processing of maliciously crafted RPC requests. The flaw resides in the application's insufficient input validation mechanisms, specifically within the RPC handling layer where integer values are used to determine buffer sizes or loop iterations. When an attacker sends a specially crafted request containing an oversized integer value, the overflow condition causes subsequent memory operations to allocate insufficient buffer space, resulting in memory corruption that can be leveraged to execute arbitrary code. This type of vulnerability aligns with CWE-190, which describes integer overflow conditions that can lead to buffer overflows, and represents a classic example of how improper integer handling can create exploitable memory corruption scenarios.
The operational impact of this vulnerability extends beyond simple remote code execution, as it affects the core security infrastructure provided by Trend Micro ServerProtect. The ServerProtect service operates with elevated privileges typically required for system-level protection functions, meaning successful exploitation could provide attackers with administrative access to protected systems. The vulnerability is particularly concerning because it affects a service that runs continuously and listens on a well-known port, making it accessible to any network entity that can reach TCP port 5168. Attackers could potentially leverage this vulnerability to gain persistent access to protected networks, escalate privileges, or deploy additional malicious payloads. The attack vector requires network connectivity to the target system's TCP port 5168, which aligns with ATT&CK technique T1190 for exploiting vulnerabilities in network services.
Mitigation strategies for this vulnerability focus on immediate patch application and network segmentation measures. Organizations should prioritize deployment of Trend Micro's 5.58 Security Patch 4 which specifically addresses the integer overflow condition in StRpcSrv.dll. In environments where patching cannot be immediately implemented, network-level controls should be enforced to restrict access to TCP port 5168, limiting exposure to trusted networks only. The vulnerability demonstrates the importance of proper integer validation in security-critical applications and highlights the need for input sanitization throughout the application lifecycle. Security monitoring should include detection of anomalous RPC request patterns and unusual memory allocation behaviors that might indicate exploitation attempts. Additionally, system administrators should implement regular vulnerability assessments to identify similar integer overflow conditions in other network services and ensure proper application hardening practices are maintained to prevent similar issues from occurring in the future.