CVE-2006-2240 in Netshelter Fw-m
Summary
by MITRE
Unspecified vulnerability in the (1) web cache or (2) web proxy in Fujitsu NetShelter/FW allows remote attackers to cause a denial of service (device unresponsiveness) via certain DNS packets, as demonstrated by the OUSPG PROTOS DNS test suite.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability described in CVE-2006-2240 represents a critical flaw in Fujitsu NetShelter/FW network security appliances that affects both web cache and web proxy functionalities. This unspecified vulnerability manifests through malicious DNS packet manipulation that can lead to complete device unresponsiveness, effectively causing a denial of service condition that compromises network availability and security operations. The vulnerability specifically targets the handling of DNS protocol communications within the appliance's network processing stack, making it particularly dangerous for organizations relying on these devices for network protection and traffic management.
The technical implementation of this vulnerability involves the manipulation of DNS packets that are processed by the affected Fujitsu NetShelter/FW appliances. When these devices receive specially crafted DNS packets, their web cache and web proxy components fail to properly handle the malformed or unexpected data, leading to system instability and eventual device unresponsiveness. The vulnerability is particularly concerning because it can be exploited remotely without requiring authentication or physical access to the device, making it a significant threat vector for attackers seeking to disrupt network services. The demonstration using the OUSPG PROTOS DNS test suite indicates that the flaw is specifically related to how the appliance processes certain DNS protocol sequences, suggesting a weakness in input validation and error handling mechanisms within the DNS processing components.
From an operational impact perspective, this vulnerability creates a severe risk to network availability and business continuity for organizations using Fujitsu NetShelter/FW appliances. The remote denial of service capability means that attackers can potentially disrupt critical network services without detection, leading to extended downtime and potential financial losses. The vulnerability affects not only the web cache functionality but also the web proxy capabilities, which means that the entire network traffic processing pipeline could be compromised simultaneously. This comprehensive impact on multiple network functions makes the vulnerability particularly dangerous as it can affect both internal network operations and external connectivity, potentially blocking legitimate user access to network resources.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to isolate the vulnerable appliances, deployment of network monitoring solutions to detect anomalous DNS traffic patterns, and implementation of access controls to limit exposure to untrusted networks. The vulnerability aligns with CWE-119 which addresses "Improper Access to Memory" and represents a classic example of how malformed input can lead to system instability and denial of service conditions. From an ATT&CK framework perspective, this vulnerability maps to the T1498 technique for "Network Denial of Service" and could potentially be leveraged as part of broader attack campaigns targeting network infrastructure availability. The lack of specific authentication requirements for exploitation makes this a particularly attractive target for automated scanning and exploitation tools, increasing the likelihood of widespread compromise across affected networks.