CVE-2006-2007 in Winny
Summary
by MITRE
Heap-based buffer overflow in Winny 2.0 b7.1 and earlier allows remote attackers to execute arbitrary code via long strings to certain commands sent to the file transfer port.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2006-2007 represents a critical heap-based buffer overflow flaw within the Winny 2.0 b7.1 and earlier versions of the peer-to-peer file sharing software. This vulnerability specifically affects the file transfer port functionality where the application fails to properly validate input lengths when processing certain commands. The flaw stems from inadequate bounds checking mechanisms in the memory management routines, creating a condition where maliciously crafted input strings can exceed the allocated buffer space and overwrite adjacent memory regions. Such buffer overflow conditions are classified under CWE-121 as heap-based buffer overflow, where the overflow occurs in heap-allocated memory rather than stack-based memory.
The operational impact of this vulnerability extends beyond simple denial of service scenarios as it provides remote attackers with the capability to execute arbitrary code on affected systems. When an attacker sends long strings to the file transfer port, the vulnerable Winny application processes these inputs without proper length validation, allowing the overflow to occur. The memory corruption resulting from this overflow can be exploited to overwrite critical program execution pointers, function return addresses, or other control data structures. This type of exploitation aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where attackers leverage buffer overflow vulnerabilities to inject and execute malicious code within the target environment.
The attack vector for this vulnerability is particularly concerning as it requires no authentication or local access to exploit the flaw, making it a remote code execution vulnerability. The file transfer port represents a network-accessible endpoint that accepts commands from remote peers, and the lack of input validation creates an ideal environment for exploitation. Attackers can craft specially formatted strings that, when processed by the vulnerable Winny application, trigger the buffer overflow condition and potentially gain full control over the affected system. This vulnerability demonstrates the critical importance of proper input validation and memory management practices in networked applications.
Mitigation strategies for CVE-2006-2007 should focus on immediate patching of the Winny software to version 2.0 b7.2 or later, which contains the necessary fixes for the buffer overflow condition. Network administrators should implement firewall rules to restrict access to the file transfer port, particularly when the application is not actively being used for legitimate file sharing operations. Additionally, system hardening measures including stack protection mechanisms, address space layout randomization, and heap integrity checks can provide additional layers of defense against exploitation attempts. The vulnerability highlights the necessity of implementing robust input validation controls and adhering to secure coding practices that prevent buffer overflow conditions, particularly in applications handling untrusted network input data.