CVE-2001-1345 in Bestcrypt
Summary
by MITRE
bctool in Jetico BestCrypt 0.7 and earlier trusts the user-supplied PATH to find and execute an fsck utility program, which allows local users to gain privileges by modifying the PATH to point to a Trojan horse program.
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Analysis
by VulDB Data Team • 05/30/2018
The vulnerability described in CVE-2001-1345 represents a classic privilege escalation flaw in the bctool utility component of Jetico BestCrypt encryption software version 0.7 and earlier. This issue stems from the software's improper handling of the PATH environment variable during the execution of filesystem check utilities. The vulnerability is categorized under CWE-78 as a "Improper Neutralization of Special Elements used in OS Command" and aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation." The core problem occurs when the bctool utility executes an fsck program without properly validating or sanitizing the PATH environment variable that determines where to search for executable files.
The technical flaw manifests in how bctool processes user-supplied PATH values when attempting to locate and execute the fsck utility. Rather than using absolute paths or implementing proper input validation, the utility relies on the system's default PATH resolution mechanism, which allows attackers to manipulate the execution flow by pre-pending malicious directories to the PATH environment variable. When a local user modifies the PATH to include a directory containing a Trojan horse version of fsck, the system will execute this malicious program instead of the legitimate filesystem checker, potentially granting the attacker elevated privileges. This behavior creates a dangerous trust relationship between the utility and the user-controlled PATH variable.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with potential access to encrypted volumes and the underlying filesystem. An attacker who successfully exploits this vulnerability could gain root access to the system, allowing them to read, modify, or delete sensitive data stored within encrypted volumes. The attack vector is particularly concerning because it requires only local user access, making it difficult to detect and prevent through network-based security measures. This vulnerability can be exploited in environments where users have legitimate access to the system but should not possess elevated privileges, creating a significant security risk for organizations relying on BestCrypt encryption software.
Mitigation strategies for CVE-2001-1345 should focus on both immediate remediation and long-term architectural improvements. The most effective immediate solution involves updating to Jetico BestCrypt versions that address this vulnerability by implementing proper PATH validation or using absolute paths when executing system utilities. Organizations should also consider implementing mandatory access controls and privilege separation mechanisms to limit the impact of such vulnerabilities. The fix should include validating that executable paths are absolute and do not rely on user-controllable environment variables. Additionally, system administrators should conduct regular security audits to identify and remediate similar issues in other utilities that may be vulnerable to PATH manipulation attacks. This vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege in system design.