CVE-2026-67438 in OliveTin
Summary
by MITRE • 07/30/2026
OliveTin gives access to predefined shell commands from a web interface. From 3000.2.0 until 3000.17.0, the service/internal/executor/arguments.go checkShellArgumentSafety function does not treat regex: custom argument types as unsafe for Shell mode actions, allowing values that pass typeSafetyCheckRegex to be interpolated by wrapCommandInShell into an sh -c command string and enabling OS command injection. This issue is fixed in version 3000.17.0.
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Analysis
by VulDB Data Team • 07/30/2026
OliveTin represents a web-based interface that enables users to execute predefined shell commands through a graphical user interface, serving as a bridge between web access and system-level operations. The application's architecture relies on a service layer that processes user inputs and translates them into shell command executions, making it a critical component for remote system administration tasks. This design approach introduces inherent security risks when handling user-provided arguments that are subsequently processed through shell interpolation mechanisms.
The vulnerability exists within the service/internal/executor/arguments.go file where the checkShellArgumentSafety function fails to properly validate custom argument types that utilize regex patterns for type safety checking. Specifically, when the typeSafetyCheckRegex validation passes, the system assumes these arguments are safe for shell execution without additional sanitization. This oversight creates a path for malicious input to bypass the intended security boundaries, as values that satisfy the regex validation criteria can still contain dangerous shell metacharacters or command sequences.
The operational impact of this vulnerability manifests through OS command injection attacks, where an attacker can manipulate the application's behavior by injecting shell commands through the web interface. The wrapCommandInShell function acts as a critical execution point where user inputs are interpolated into sh -c command strings, directly exposing the system to arbitrary command execution. This allows attackers to perform unauthorized operations including data exfiltration, system compromise, privilege escalation, and persistent access to the underlying host environment.
This vulnerability aligns with CWE-78, which specifically addresses OS Command Injection, and demonstrates a failure in input validation and sanitization practices that are fundamental to secure application design. The issue also maps to ATT&CK technique T1059.004 for command and scripting interpreter, where adversaries leverage legitimate system tools to execute malicious commands. The attack surface expands significantly since the vulnerability affects all Shell mode actions within OliveTin's interface, making it a critical security concern for any deployment that allows user interaction with shell-based command execution.
The fix implemented in version 3000.17.0 addresses this by strengthening the argument validation logic to properly evaluate custom argument types against shell safety requirements regardless of regex validation results. Organizations should ensure immediate upgrade to version 3000.17.0 or later to mitigate this risk. Additional mitigations include implementing strict input validation policies, using parameterized command execution where possible, and regularly auditing application interfaces for similar security flaws. Security teams should also consider network segmentation and monitoring for suspicious command execution patterns that may indicate exploitation attempts.
The vulnerability highlights the importance of comprehensive security testing beyond basic regex validation, particularly in applications that bridge web interfaces with system-level operations. It demonstrates how seemingly innocuous architectural decisions can create significant attack vectors when proper input sanitization procedures are not implemented. Organizations using OliveTin or similar applications should conduct thorough security assessments to identify and remediate similar issues in their own systems, ensuring that all user inputs undergo appropriate validation before being processed through shell execution contexts.