CVE-2007-3871 in Stampit Web
Summary
by MITRE
Stampit Web uses guessable id values for online stamp purchases, which allows remote attackers to cause a denial of service (stamp invalidation) via a SOAP request with an id value for a stamp that has not yet been printed.
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Analysis
by VulDB Data Team • 10/29/2017
The vulnerability described in CVE-2007-3871 affects Stampit Web systems that utilize guessable identification values for online stamp purchases. This weakness represents a significant security flaw in the system's session management and resource validation mechanisms. The issue stems from the predictable nature of identifier values used in the stamp purchasing process, which creates opportunities for malicious actors to exploit the system's lack of proper validation controls. The vulnerability specifically impacts the SOAP-based web services architecture that handles stamp transactions, making it particularly concerning given the widespread adoption of SOAP protocols in enterprise web applications during this timeframe.
The technical flaw manifests through the use of guessable or predictable ID values that are generated without sufficient entropy or cryptographic randomness. When attackers submit SOAP requests containing these predictable identifiers for stamps that have not yet been printed, the system fails to properly validate whether the requested stamp exists or has been properly processed. This validation failure leads to a denial of service condition where legitimate stamps become invalidated, effectively rendering them unusable. The vulnerability operates at the application layer and leverages the fundamental weakness in identifier generation and validation processes, which is categorized under CWE-184 as incomplete input validation and CWE-310 as cryptographic issues related to predictable identifiers.
From an operational impact perspective, this vulnerability creates substantial disruption to the stamp purchasing and validation system. Attackers can systematically guess valid stamp identifiers and submit malicious SOAP requests that invalidate legitimate stamps, effectively causing a denial of service for legitimate users. The impact extends beyond simple service interruption to include potential financial losses and reputational damage for the organization. The vulnerability allows for automated exploitation through simple scripts that iterate through predictable identifier patterns, making it particularly dangerous for high-volume transaction systems. This type of attack aligns with ATT&CK technique T1499.004 for network denial of service and demonstrates how weak identifier management can lead to cascading system failures.
The mitigation strategies for this vulnerability require immediate implementation of robust identifier generation mechanisms that incorporate sufficient entropy and cryptographic randomness. Systems should implement proper input validation and verification processes that ensure stamp identifiers are unique, unpredictable, and properly tracked throughout the purchasing lifecycle. Organizations should also implement rate limiting and monitoring mechanisms to detect unusual patterns of stamp invalidation attempts. The solution involves upgrading the SOAP service to include comprehensive validation routines that verify stamp existence and status before processing any invalidation requests. Additionally, implementing proper access controls and authentication mechanisms would further reduce the attack surface and prevent unauthorized manipulation of stamp identifiers. This vulnerability highlights the critical importance of proper identifier management in web services and the potential consequences of inadequate cryptographic practices in transactional systems.