CVE-2008-5905 in KTorrent
Summary
by MITRE
The web interface plugin in KTorrent before 3.1.4 allows remote attackers to bypass intended access restrictions and upload arbitrary torrent files, and trigger the start of downloads and seeding, via a crafted HTTP POST request.
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Analysis
by VulDB Data Team • 08/28/2019
The vulnerability identified as CVE-2008-5905 represents a critical access control flaw within the web interface plugin of KTorrent versions prior to 3.1.4. This security weakness stems from insufficient input validation and authentication mechanisms within the application's web-based management interface. The flaw enables remote attackers to circumvent the intended security boundaries that should prevent unauthorized file operations and download initiation. The vulnerability specifically affects the HTTP POST request processing functionality, where malicious actors can construct specially crafted requests to exploit the weak access controls.
The technical implementation of this vulnerability involves a failure in the web interface plugin's authorization logic. When KTorrent processes HTTP POST requests through its web interface, it does not properly validate whether the requesting user possesses the necessary privileges to perform file upload operations or initiate download activities. This represents a classic case of insufficient authorization checks, which maps directly to CWE-285, specifically the weakness of insufficient authorization. The vulnerability allows attackers to bypass authentication mechanisms entirely, enabling them to upload arbitrary torrent files without proper user credentials or permissions. This flaw operates at the application layer and can be exploited through network-based attacks without requiring local system access or elevated privileges.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with the capability to trigger automated download and seeding activities within the compromised system. An attacker can upload malicious torrent files and immediately initiate downloads, potentially consuming significant bandwidth and storage resources. The ability to start seeding operations further amplifies the threat, as it allows attackers to distribute content through the compromised KTorrent instance. This vulnerability can be exploited to create a botnet of compromised systems that actively participate in peer-to-peer networks, potentially facilitating the spread of malware or illegal content. The impact is particularly severe in environments where KTorrent is used for legitimate file sharing but lacks proper network segmentation or monitoring controls.
Mitigation strategies for this vulnerability require immediate implementation of software updates to KTorrent version 3.1.4 or later, which contains the necessary fixes for the access control bypass. Organizations should also implement network-based restrictions to limit access to the web interface plugin, ensuring that only authorized users can reach the vulnerable endpoints. The implementation of proper authentication mechanisms and input validation should be enforced at the application level, including the enforcement of strict authorization checks for all HTTP POST requests. Additionally, network monitoring solutions should be deployed to detect unusual torrent file upload patterns and unauthorized download initiation activities. This vulnerability demonstrates the importance of proper access control implementation and aligns with ATT&CK technique T1078 which addresses valid accounts and T1059 which covers command and scripting interpreter. The remediation process should include comprehensive security testing to ensure that no other similar authorization bypass vulnerabilities exist within the application's web interface components.