CVE-2003-0596 in FDclone
Summary
by MITRE
FDclone 2.00a, and other versions before 2.02a, creates temporary directories with predictable names and uses them if they already exist, which allows local users to read or modify files of other fdclone users by creating the directory ahead of time.
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Analysis
by VulDB Data Team • 05/02/2019
The vulnerability identified as CVE-2003-0596 affects FDclone version 2.00a and earlier versions prior to 2.02a, representing a significant security flaw in temporary file handling mechanisms. This issue stems from the application's predictable temporary directory naming convention, which creates opportunities for privilege escalation and unauthorized data access within local user environments. The vulnerability specifically manifests when the application attempts to create temporary directories with fixed or easily guessable names, particularly when such directories already exist from previous operations or malicious intervention.
The technical flaw exploits a fundamental weakness in temporary file management by utilizing predictable naming patterns that allow attackers to anticipate and pre-create directory structures before the legitimate application attempts to use them. This predictable behavior enables local users to establish temporary directories with the same names that FDclone would normally create, effectively hijacking the application's temporary file operations. When the vulnerable application encounters these pre-existing directories, it operates on them rather than creating new ones, thereby allowing the attacker to access or manipulate files that should remain protected from other users.
This vulnerability fundamentally compromises the principle of least privilege and file system security by enabling unauthorized file access and modification within the context of the application's temporary directory operations. The operational impact extends beyond simple information disclosure, as attackers can potentially modify critical application data, inject malicious content, or even escalate privileges through manipulation of temporary files that the application processes. The local nature of this vulnerability means that it requires physical or network access to the target system, but once exploited, it can provide attackers with persistent access to user data and application functionality.
The vulnerability aligns with CWE-377, which addresses insecure temporary file creation practices, and demonstrates how predictable naming patterns can lead to privilege escalation and unauthorized access. From an attack perspective, this issue maps to ATT&CK technique T1059.007 for command and scripting interpreter usage, as attackers may leverage the temporary file manipulation to execute malicious code through the compromised application. The vulnerability also relates to T1548.001 for abuse of privileges, as it enables attackers to potentially escalate their access level within the application's operational context. Mitigation strategies should focus on implementing secure temporary file creation mechanisms with random or unique naming conventions, proper directory permissions, and ensuring that applications do not reuse pre-existing temporary directories without thorough validation.
The security implications of this vulnerability extend to multi-user systems where multiple users share the same application environment, as it creates potential for cross-user data exposure and unauthorized file manipulation. Organizations should implement immediate patching procedures to upgrade to FDclone version 2.02a or later, which addresses this vulnerability through improved temporary directory handling and randomization techniques. Additionally, system administrators should conduct security audits to identify other applications with similar predictable temporary file behaviors and implement comprehensive temporary file management policies that align with security best practices and industry standards. The vulnerability serves as a reminder of the critical importance of secure temporary file handling in preventing local privilege escalation attacks and maintaining data integrity across multi-user environments.