CVE-2008-0364 in BitTorrent
Summary
by MITRE
Buffer overflow in (1) BitTorrent 6.0 and earlier; and (2) uTorrent 1.7.5 and earlier, and 1.8-alpha-7834 and earlier in the 1.8.x series; on Windows allows remote attackers to cause a denial of service (application crash) via a long Unicode string representing a client version identifier.
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Analysis
by VulDB Data Team • 03/26/2019
The vulnerability described in CVE-2008-0364 represents a critical buffer overflow flaw affecting popular BitTorrent clients including versions 6.0 and earlier of BitTorrent client, as well as uTorrent versions 1.7.5 and earlier and 1.8-alpha-7834 and earlier in the 1.8.x series on Windows platforms. This issue stems from inadequate input validation mechanisms within the client software's handling of client version identifiers, which are typically transmitted during peer-to-peer network communication as part of the protocol handshake process. The flaw specifically manifests when the application encounters a Unicode string that exceeds the allocated buffer space, creating conditions that can be exploited by remote attackers to trigger application instability.
The technical implementation of this vulnerability involves the improper handling of Unicode strings during the client version identification process within the BitTorrent protocol implementation. When a malicious peer sends a specially crafted long Unicode string as part of the client version information, the receiving BitTorrent client fails to properly validate the string length before copying it into a fixed-size buffer. This classic buffer overflow condition occurs because the software does not perform bounds checking on the incoming data, allowing the overflow to overwrite adjacent memory locations in the application's address space. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which directly impacts the application's memory management and can lead to arbitrary code execution or complete application crash.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it provides attackers with a mechanism to disrupt peer-to-peer networking activities and potentially compromise the stability of entire torrent networks. When exploited, the buffer overflow causes the affected BitTorrent client to crash and terminate unexpectedly, forcing users to restart their applications and potentially interrupting ongoing file transfers. This disruption can be particularly problematic in environments where BitTorrent clients are used for legitimate file distribution, as it creates opportunities for attackers to systematically destabilize peer networks and interfere with normal peer-to-peer operations. The vulnerability affects Windows platforms exclusively, making it relevant to users of the Windows operating system who rely on these BitTorrent implementations for file sharing activities.
Mitigation strategies for this vulnerability should focus on immediate software updates to patched versions of both BitTorrent and uTorrent clients, as well as implementing network-level protections to monitor and filter suspicious peer communications. Organizations and individual users should prioritize updating to versions that include proper input validation and buffer size checking mechanisms. The fix typically involves implementing proper bounds checking on Unicode string inputs and ensuring that all incoming client version identifiers are validated against maximum allowable lengths before being processed. Additionally, network administrators should consider implementing intrusion detection systems that can identify and block malformed BitTorrent protocol communications that may contain oversized Unicode strings. This vulnerability demonstrates the importance of robust input validation in network protocols and highlights the need for security-conscious development practices that follow established secure coding guidelines and standards. The issue also aligns with ATT&CK technique T1203 which involves the exploitation of software vulnerabilities for denial of service and system disruption purposes.