CVE-2001-0464 in Cyberscheduler
Summary
by MITRE
Buffer overflow in websync.exe in Cyberscheduler allows remote attackers to execute arbitrary commands via a long tzs (timezone) parameter.
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Analysis
by VulDB Data Team • 10/06/2025
The vulnerability identified as CVE-2001-0464 represents a critical buffer overflow flaw in the websync.exe component of Cyberscheduler software. This issue manifests within the handling of timezone parameters, specifically when processing the tzs parameter in network requests. The buffer overflow occurs when the application fails to properly validate the length of incoming timezone data, allowing an attacker to exceed the allocated buffer space and overwrite adjacent memory locations. This particular vulnerability resides in the web synchronization service that facilitates calendar and scheduling data exchange between clients and the server.
The technical exploitation of this vulnerability follows a classic buffer overflow attack pattern where malicious input data exceeds the predetermined buffer boundaries in memory. When a remote attacker sends a specially crafted request containing an excessively long timezone parameter, the websync.exe process allocates insufficient memory space to accommodate the input. This overflow enables the attacker to overwrite return addresses, function pointers, and other critical memory segments, potentially allowing arbitrary code execution with the privileges of the websync.exe process. The vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a direct threat to the integrity and availability of the affected system.
From an operational perspective, this vulnerability presents a severe risk to organizations relying on Cyberscheduler for their scheduling and calendar management functions. Remote attackers can leverage this weakness to gain unauthorized access to systems, execute malicious code, and potentially establish persistent backdoors within the network infrastructure. The impact extends beyond simple command execution as it could lead to complete system compromise, data exfiltration, and disruption of critical scheduling services. The vulnerability affects the availability of the web synchronization service and could result in denial of service conditions for legitimate users attempting to access calendar and scheduling functionality. Organizations using this software face significant exposure to attacks targeting their calendar infrastructure and could experience cascading effects on business operations dependent on synchronized scheduling data.
Mitigation strategies for CVE-2001-0464 should prioritize immediate patching of the affected Cyberscheduler software to address the buffer overflow condition. Organizations must implement input validation measures to restrict the length of timezone parameters and sanitize all user-supplied data before processing. Network segmentation and firewall rules should be configured to limit access to the websync.exe service to trusted networks only, while monitoring systems should be deployed to detect anomalous requests containing oversized timezone parameters. The implementation of address space layout randomization and stack canaries can provide additional defense-in-depth measures against exploitation attempts. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other applications and services within the organization's infrastructure. This vulnerability demonstrates the importance of proper input validation and memory management practices in preventing remote code execution attacks, aligning with ATT&CK technique T1059 for command and scripting interpreter and T1203 for exploitation for privilege escalation.