CVE-2012-5345 in IpTools
Summary
by MITRE
Buffer overflow in the Remote command server (Rcmd.bat) in IpTools (aka Tiny TCP/IP server) 0.1.4 allows remote attackers to cause a denial of service (crash) via a long string to TCP port 23.
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Analysis
by VulDB Data Team • 08/31/2025
The vulnerability identified as CVE-2012-5345 represents a critical buffer overflow flaw within the Remote command server component of IpTools version 0.1.4, commonly known as Tiny TCP/IP server. This particular implementation flaw exists in the Rcmd.bat script that handles incoming connections on TCP port 23, which is the standard port for telnet services. The vulnerability manifests when the server receives an excessively long string input that exceeds the allocated buffer space, leading to memory corruption and subsequent system instability. The affected software operates as a lightweight TCP/IP server implementation that provides basic networking services including remote command execution capabilities through its telnet interface.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In this specific case, the buffer overflow occurs during the processing of user input through the telnet service on port 23, where the server fails to properly validate the length of incoming data before attempting to store it in fixed-size memory buffers. The flaw exploits the inherent lack of input sanitization mechanisms within the Rcmd.bat script, which serves as the command processing interface for remote users connecting to the Tiny TCP/IP server. When an attacker sends a malformed string exceeding the buffer capacity, the overflow corrupts stack memory or heap allocations, causing the application to crash and terminate unexpectedly.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable more sophisticated attack vectors. While the immediate effect is a denial of service condition that crashes the server application, the underlying buffer overflow creates opportunities for attackers to execute arbitrary code or escalate privileges within the compromised system. The vulnerability is particularly concerning because it affects a core networking component that provides remote access capabilities, making it a prime target for exploitation. Attackers can leverage this weakness to gain unauthorized access to systems running vulnerable versions of IpTools, potentially leading to complete system compromise. The vulnerability is classified under the MITRE ATT&CK framework as part of the T1203 - Exploitation for Client Execution technique, where attackers exploit software vulnerabilities to execute malicious code.
Mitigation strategies for CVE-2012-5345 must address both immediate protection and long-term security hardening measures. The most effective immediate solution involves updating to a patched version of IpTools that implements proper input validation and buffer size checking mechanisms. Organizations should also implement network segmentation and access controls to limit exposure of vulnerable systems to untrusted networks. Network-level protections such as firewall rules that restrict access to TCP port 23 can help reduce the attack surface, while intrusion detection systems should be configured to monitor for suspicious traffic patterns associated with buffer overflow attempts. Additionally, input validation should be implemented at multiple layers including application-level checks, protocol-level sanitization, and network-level filtering to create defense-in-depth controls. The vulnerability demonstrates the critical importance of proper memory management and input validation in network services, as highlighted by the OWASP Top Ten security risks that emphasize the dangers of buffer overflows and injection attacks in web and network applications.