Out-of-Bounds Write in nnn File Manager

Executive Summary

nnn is vulnerable to an Out-of-Bounds write issue. When a user loads a session file using the -s option, the application fails to validate attacker-controlled length fields in the file. This allows a crafted session file to write data beyond the limits of fixed-size global buffers, potentially corrupting adjacent global state.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by checking for malicious session files in the nnn session directory. Look for files that were not created by the user or have unusual content. Use commands like 'ls -la ~/.config/nnn/sessions/' to inspect session files. If you find any suspicious files, especially those with unexpected sizes or timestamps, they may be crafted to exploit this vulnerability.

Useful 0 Not Useful 0

Impact Analysis

An attacker who can place a malicious session file in the victim's nnn session directory may exploit this to corrupt memory. This could lead to crashes, unexpected behavior, or potentially allow further exploitation depending on the corrupted state.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA by enabling memory corruption through crafted session files or environment manipulation. Exploitation could lead to unauthorized data access or system compromise, violating confidentiality and integrity requirements under these regulations.

Useful 0 Not Useful 0

Mitigation Strategies

Immediately stop using the -s option with nnn until a patch is available. Remove any untrusted session files from the nnn session directory. Monitor for unusual system behavior or crashes that could indicate exploitation. Consider temporarily disabling nnn or using alternative tools until the maintainer releases a fixed version.

Useful 0 Not Useful 0