CVE-2008-1877 in tss
Summary
by MITRE
tss 0.8.1 allows local users to read arbitrary files via the -a parameter, which is processed while tss is running with privileges.
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Analysis
by VulDB Data Team • 09/22/2018
The vulnerability identified as CVE-2008-1877 affects the tss software version 0.8.1 and represents a significant local privilege escalation and information disclosure weakness. This flaw manifests through the improper handling of the -a parameter during execution with elevated privileges, creating a dangerous condition where unauthorized local users can access files they should not be able to read. The vulnerability operates under the principle of privilege escalation by exploiting the software's failure to properly validate or sanitize input parameters before processing them with administrative rights.
The technical implementation of this vulnerability stems from insufficient input validation mechanisms within the tss application's parameter processing logic. When the application runs with elevated privileges and encounters the -a parameter, it fails to properly restrict file access paths or validate the file references provided by the user. This creates an arbitrary file read condition where local attackers can specify any file path that the application can access, potentially leading to sensitive information disclosure including system configuration files, user credentials, or other privileged data. The flaw directly aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can serve as a stepping stone for further attacks within a compromised system. Local users who exploit this vulnerability can potentially access critical system files, configuration data, or user-specific information that may contain passwords, cryptographic keys, or other sensitive materials. The attack vector is particularly concerning because it requires no network connectivity and can be executed locally, making it difficult to detect through traditional network monitoring systems. This vulnerability also demonstrates poor privilege separation practices, as the application should not process user-controlled parameters with elevated privileges without proper sanitization and validation.
Mitigation strategies for this vulnerability involve multiple layers of security controls. The most direct approach requires updating to a patched version of tss software where the -a parameter processing has been properly secured with input validation and privilege restriction mechanisms. System administrators should implement proper privilege separation by ensuring that applications process user input with minimal necessary privileges rather than elevated rights. Additionally, the principle of least privilege should be enforced through proper file system permissions and access controls. Organizations should also consider implementing application whitelisting solutions and monitoring for unusual file access patterns that could indicate exploitation attempts. The vulnerability highlights the importance of proper input validation and privilege management practices as outlined in the mitre ATT&CK framework's privilege escalation tactics, specifically targeting the use of legitimate user privileges for unauthorized access.