CVE-2008-6935 in Exodus
Summary
by MITRE
Argument injection vulnerability in Exodus 0.10 allows remote attackers to inject arbitrary command line arguments, overwrite arbitrary files, and cause a denial of service via encoded spaces in an im:// URI.
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Analysis
by VulDB Data Team • 11/11/2024
The CVE-2008-6935 vulnerability represents a critical argument injection flaw in Exodus 0.10, a popular peer-to-peer file sharing application that was widely used in the early 2000s. This vulnerability stems from inadequate input validation and sanitization within the application's handling of im:// URIs, which are used to initiate instant messaging connections in the eDonkey network. The flaw specifically manifests when the application processes encoded spaces within these URIs, creating a pathway for malicious actors to manipulate command line arguments and execute unauthorized operations. The vulnerability operates at the application layer and leverages improper parsing of URI components, making it particularly dangerous as it can be triggered through web-based or networked interactions without requiring local system access.
The technical implementation of this vulnerability involves the exploitation of a command line argument injection mechanism where encoded space characters in im:// URIs are not properly sanitized or escaped. When Exodus processes these malformed URIs, it fails to correctly validate the argument structure, allowing attackers to inject additional command line parameters that are subsequently executed by the application. This behavior creates multiple attack vectors including arbitrary file overwrites, where malicious arguments can target system files or configuration data, and denial of service conditions where legitimate application functionality is disrupted through command injection. The vulnerability's impact extends beyond simple command execution as it can be leveraged to manipulate the application's operational state and potentially compromise the underlying system.
The operational impact of CVE-2008-6935 is significant within the context of peer-to-peer networking environments where Exodus was commonly deployed. Attackers can exploit this vulnerability remotely to gain unauthorized control over affected systems, potentially leading to complete system compromise or service disruption. The ability to overwrite arbitrary files through command injection creates persistent threats where attackers can modify application binaries, configuration files, or system resources to maintain access or cause ongoing disruption. Additionally, the denial of service component can be used to render the affected application unusable, impacting legitimate users within the peer-to-peer network and potentially affecting network-wide operations. This vulnerability particularly affects systems where Exodus is running with elevated privileges, amplifying the potential damage from command injection attacks.
Mitigation strategies for CVE-2008-6935 should focus on immediate input validation and sanitization improvements within the application's URI processing mechanisms. The most effective approach involves implementing strict parameter validation that rejects or properly escapes encoded space characters and other potentially malicious URI components before they are processed as command line arguments. Organizations should also consider implementing network-level controls such as firewall rules that restrict access to affected services and monitoring for suspicious URI patterns. The vulnerability aligns with CWE-77 and CWE-78 categories from the Common Weakness Enumeration, which classify it as a command injection vulnerability that occurs due to insufficient input sanitization. From an ATT&CK framework perspective, this vulnerability maps to T1059.007 for command and scripting interpreter and T1566 for credential harvesting, as attackers can leverage the compromised application to execute malicious commands or extract user information. System administrators should also ensure that Exodus is updated to patched versions or replaced with more secure alternatives, as this vulnerability was not remediated in the original Exodus 0.10 release and represents a fundamental design flaw in the application's security architecture.