Description

NexTor IP Changer is a command-line tool that leverages the Tor network to periodically rotate a user's IP address. Versions prior to 2.0.0 execute privileged system commands using `sudo` and `shell=True` directly inside application logic. In environments where passwordless sudo (`NOPASSWD`) is enabled, privileged commands may execute silently without explicit user confirmation. Version 2.0.0 fixes the issue.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.3",
  "pubDate": "2026-08-07T19:17:47.780Z",
  "pubdate": "2026-08-07T19:17:47.780Z",
  "executiveSummary": "NexTor IP Changer versions prior to 2.0.0 are affected by an insecure command execution vulnerability resulting in potential privilege escalation. The vulnerability stems from the direct execution of privileged system commands within the application logic utilizing the sudo utility alongside shell=True. This flaw impacts systems running vulnerable versions of NexTor IP Changer, particularly configurations where passwordless sudo with NOPASSWD is enabled for the execution context. Under such conditions, privileged commands are executed silently and without requiring explicit user confirmation. An attacker or unauthorized process capable of interacting with the application logic can leverage this implementation flaw to execute arbitrary system commands with elevated administrative privileges. The risk implications include complete system compromise, unauthorized modification of host configurations, and potential abuse of underlying OS capabilities. Exploitation requires the presence of an environment where passwordless sudo privileges are misconfigured or overly permissive, combined with the execution of the vulnerable application logic. Remediation requires upgrading the affected product to version 2.0.0, which resolves the issue by eliminating insecure command execution patterns.",
  "technicalDetails": "The root cause of the vulnerability resides in the core application logic of NexTor IP Changer versions prior to 2.0.0, where system commands designed to rotate the user's IP address are invoked via the sudo utility with the shell=True parameter enabled. Utilizing shell=True in combination with dynamic or weakly validated input strings introduces severe command injection risks and bypasses standard argument separation provided by process execution wrappers. Specifically, the application constructs and evaluates commands directly within a shell environment, inheriting the security context of the invoking user or the configured sudo policy. In target environments where the executing user or service account is granted passwordless sudo access via NOPASSWD directives in the sudoers configuration, these privileged commands execute silently without prompting for interactive authentication or prompting the user for confirmation. The attack flow initiates when an adversary interacts with or manipulates the execution context of the NexTor IP Changer utility. Because the application processes internal logic or parameters using shell=True, an attacker who can influence input parameters or exploit underlying command strings can achieve arbitrary command execution. The vulnerable component consists of the command execution module responsible for interfacing with the operating system network stack and the Tor routing infrastructure. Affected versions comprise all releases preceding version 2.0.0. Authentication and privilege requirements vary depending on local system access; however, the presence of NOPASSWD sudo configurations drastically lowers the barrier to achieving unauthorized root or administrative execution. The network exposure is primarily local to the host operating system, impacting the local trust boundary. Payload behavior involves the spawning of child processes under the elevated security context of the root user or administrator. Post-exploitation impact includes full system takeover, persistence establishment, unauthorized access to sensitive system files, and complete compromise of host integrity."
}