Summary
ZoneMinder contains an OS command injection vulnerability in event export processing because a monitor name is manually quoted before being passed to shell commands. An attacker who can store a monitor name containing shell metacharacters and whose account can export that monitor's events may execute arbitrary commands as the web server user.
ZoneMinder contains an OS command injection vulnerability in event export processing because a monitor name is manually quoted before being passed to shell commands. An attacker who can store a monitor name containing shell metacharacters and whose account can export that monitor's events may execute arbitrary commands as the web server user.
Affected context
The issue occurs in ZoneMinder deployments that use event export functionality and permit users with monitor-create or monitor-edit permissions to set monitor names. Risk arises when a user with Events View permission exports events for a monitor whose stored name contains shell-significant characters, allowing the value to reach command construction for media concatenation and archive creation.
The issue occurs in ZoneMinder deployments that use event export functionality and permit users with monitor-create or monitor-edit permissions to set monitor names. Risk arises when a user with Events View permission exports events for a monitor whose stored name contains shell-significant characters, allowing the value to reach command construction for media concatenation and archive creation.
Exploit preconditions
- Attack surface: ZoneMinder web application event export functionality
- Required access: Permission to create or edit a monitor name, plus access to view and export that monitor's events
- Trigger point: Event export processing through media and archive command construction
- Why exploitation is possible: The monitor name is manually enclosed in single quotes rather than safely escaped for shell use, allowing shell metacharacters in stored input to alter command interpretation
- Attack surface: ZoneMinder web application event export functionality
- Required access: Permission to create or edit a monitor name, plus access to view and export that monitor's events
- Trigger point: Event export processing through media and archive command construction
- Why exploitation is possible: The monitor name is manually enclosed in single quotes rather than safely escaped for shell use, allowing shell metacharacters in stored input to alter command interpretation
Why this happens
The vulnerability results from constructing shell commands with user-controlled monitor names and relying on manual quoting instead of a context-aware argument-escaping mechanism. Because shell parsing can treat embedded metacharacters as operators or separators, attacker-controlled data may become executable command syntax rather than remaining a literal argument. This behavior maps to CWE-78: Improper Neutralization of Special Elements used in an OS Command.
The vulnerability results from constructing shell commands with user-controlled monitor names and relying on manual quoting instead of a context-aware argument-escaping mechanism. Because shell parsing can treat embedded metacharacters as operators or separators, attacker-controlled data may become executable command syntax rather than remaining a literal argument. This behavior maps to CWE-78: Improper Neutralization of Special Elements used in an OS Command.
Potential impact
- Arbitrary commands may execute with the privileges of the web server user
- Attackers could access, alter, or delete application data
- System credentials and locally accessible secrets could be exposed
- The ZoneMinder host could be used for persistence or lateral movement
- Recorded media and exported archives could be modified or removed
- Arbitrary commands may execute with the privileges of the web server user
- Attackers could access, alter, or delete application data
- System credentials and locally accessible secrets could be exposed
- The ZoneMinder host could be used for persistence or lateral movement
- Recorded media and exported archives could be modified or removed
General mitigation guidance
Mitigation should focus on removing shell interpretation from application workflows and reducing trust in user-controlled monitor metadata.
Common defensive patterns include:
- Invoke media-processing and archive functionality through argument arrays or library APIs instead of shell command strings
- Apply dedicated, context-appropriate argument escaping when a shell cannot be avoided
- Validate monitor names against a restrictive allowlist of expected characters and length
- Keep user-controlled names separate from command syntax and executable paths
- Run the web application with the least privileges required to perform its functions
- Restrict access to event-export capabilities and protect sensitive files from the web-server account
Mitigation should focus on removing shell interpretation from application workflows and reducing trust in user-controlled monitor metadata.
Common defensive patterns include:
- Invoke media-processing and archive functionality through argument arrays or library APIs instead of shell command strings
- Apply dedicated, context-appropriate argument escaping when a shell cannot be avoided
- Validate monitor names against a restrictive allowlist of expected characters and length
- Keep user-controlled names separate from command syntax and executable paths
- Run the web application with the least privileges required to perform its functions
- Restrict access to event-export capabilities and protect sensitive files from the web-server account
How teams detect issues like this
Organizations can look for this weakness through:
- Static analysis rules identifying shell execution APIs that interpolate database-backed or request-derived values
- Code review checks for manual quote wrapping, string concatenation, or formatting used to build commands
- Tests that verify special characters remain data when passed to media and archive operations
- Runtime monitoring for unexpected child processes launched by the web server
- Application and host policies that alert on abnormal command execution, archive creation, or access to sensitive files
Automated code review and software composition analysis tools may help identify risky command-construction patterns, but findings should be validated against the actual execution path.
Organizations can look for this weakness through:
- Static analysis rules identifying shell execution APIs that interpolate database-backed or request-derived values
- Code review checks for manual quote wrapping, string concatenation, or formatting used to build commands
- Tests that verify special characters remain data when passed to media and archive operations
- Runtime monitoring for unexpected child processes launched by the web server
- Application and host policies that alert on abnormal command execution, archive creation, or access to sensitive files
Automated code review and software composition analysis tools may help identify risky command-construction patterns, but findings should be validated against the actual execution path.
