CVE-2006-3880 in Windows
Summary
by MITRE
** DISPUTED ** Microsoft Windows NT 4.0, Windows 2000, Windows XP, and Windows Small Business Server 2003 allow remote attackers to cause a denial of service (IP stack hang) via a continuous stream of packets on TCP port 135 that have incorrect TCP header checksums and random numbers in certain TCP header fields, as demonstrated by the Achilles Windows Attack Tool. NOTE: the researcher reports that the Microsoft Security Response Center has stated "Our investigation which has included code review, review of the TCPDump, and attempts on reproing the issue on multiple fresh installs of various Windows Operating Systems have all resulted in non confirmation."
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2006-3880 represents a potential denial of service condition affecting multiple versions of Microsoft Windows operating systems including Windows NT 4.0, Windows 2000, Windows XP, and Windows Small Business Server 2003. This issue manifests when remote attackers send a continuous stream of packets to TCP port 135 with deliberately malformed TCP header checksums and random values in specific TCP header fields. The attack vector specifically targets the Windows TCP/IP stack implementation, exploiting what appears to be a weakness in how the operating system processes malformed network traffic. The demonstration tool known as Achilles Windows Attack Tool was used to showcase this vulnerability, suggesting that under certain conditions the targeted systems could become unresponsive or experience significant performance degradation due to the malformed packet processing.
The technical flaw exploited in this vulnerability resides in the TCP/IP stack implementation within the Windows operating systems, particularly concerning how they handle malformed TCP headers. When the system receives packets with incorrect TCP header checksums and random values in certain header fields, it appears to process these packets in a manner that causes the IP stack to hang or become unresponsive. This behavior aligns with common patterns found in network stack vulnerabilities where malformed input causes the system to enter an infinite loop or consume excessive resources during packet processing. The vulnerability specifically targets TCP port 135, which is commonly used for the DCOM Remote Procedure Call service, making it particularly significant for networked environments where these services are active. The issue demonstrates a classic example of a resource exhaustion or processing loop vulnerability that can be exploited without requiring authentication or special privileges.
The operational impact of this vulnerability extends beyond simple service interruption to potentially affecting entire network operations within affected environments. When the TCP/IP stack becomes unresponsive due to malformed packet processing, it can result in complete network connectivity issues for systems running the vulnerable Windows versions. This affects not only the targeted system but can also impact network communications for other devices that depend on proper TCP/IP functionality. The vulnerability's potential for causing widespread disruption increases when considering that TCP port 135 is frequently used for legitimate network services, meaning that an attack could affect business operations and network availability. Organizations relying on these older Windows versions for critical operations would face significant risk if this vulnerability were confirmed to be exploitable, as it could lead to extended downtime and service interruptions.
Despite the initial reporting of this vulnerability, Microsoft's Security Response Center conducted extensive investigation including code review, TCPDump analysis, and multiple fresh installations to reproduce the issue. Their findings resulted in non-confirmation of the vulnerability, suggesting that either the specific conditions required for exploitation are not easily reproducible or that the vulnerability may not exist in the manner initially described. This discrepancy highlights the importance of proper validation in vulnerability assessment and demonstrates how initial reports may not always align with vendor investigations. The vulnerability's disputed status reflects the complexity of network stack exploitation and the challenges in reproducing certain types of denial of service conditions. Organizations should continue monitoring security advisories and vendor responses to ensure they maintain accurate information about potential threats to their systems. The situation also underscores the need for proper network segmentation and monitoring to detect unusual traffic patterns that might indicate attempted exploitation of network vulnerabilities. From a cybersecurity perspective, this case illustrates the importance of maintaining updated security information and the potential for false positives in vulnerability reporting, particularly for older operating systems that may not receive continued support or detailed security analysis.