Summary
ZoneMinder contains an operating system command injection vulnerability in its event export workflow, where attacker-controlled export parameters are incorporated into shell commands without adequate neutralization. An authenticated user with event or snapshot viewing permissions may execute arbitrary commands as the web server account when the export request meets the required CSRF and option conditions.
ZoneMinder contains an operating system command injection vulnerability in its event export workflow, where attacker-controlled export parameters are incorporated into shell commands without adequate neutralization. An authenticated user with event or snapshot viewing permissions may execute arbitrary commands as the web server account when the export request meets the required CSRF and option conditions.
Affected context
The issue occurs in ZoneMinder versions before 1.38.3 when the event export functionality processes the exportFile request parameter through exportEvents() and related export components. Risk depends on the application invoking shell utilities through exec() while allowing user-influenced values to reach command arguments without strong separation between data and executable command syntax.
The issue occurs in ZoneMinder versions before 1.38.3 when the event export functionality processes the exportFile request parameter through exportEvents() and related export components. Risk depends on the application invoking shell utilities through exec() while allowing user-influenced values to reach command arguments without strong separation between data and executable command syntax.
Exploit preconditions
- Attack surface: Authenticated event export functionality exposed through the web application
- Required access: An account with View Events or View Snapshots permission
- Trigger point: Submission of an event export request with export functionality enabled
- Additional conditions: A valid CSRF token and
exportDetailenabled - Why exploitation is possible: The
exportFilevalue reaches a shell command argument without sufficient metacharacter neutralization, allowing command interpretation by the operating system
- Attack surface: Authenticated event export functionality exposed through the web application
- Required access: An account with View Events or View Snapshots permission
- Trigger point: Submission of an event export request with export functionality enabled
- Additional conditions: A valid CSRF token and
exportDetailenabled - Why exploitation is possible: The
exportFilevalue reaches a shell command argument without sufficient metacharacter neutralization, allowing command interpretation by the operating system
Why this happens
The vulnerability results from constructing shell commands by concatenating attacker-controlled input and executing the resulting string through a shell-capable process interface. This insecure pattern allows data intended to represent a file or directory path to alter command parsing when shell metacharacters are present. The behavior maps to CWE-78: Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection.
The vulnerability results from constructing shell commands by concatenating attacker-controlled input and executing the resulting string through a shell-capable process interface. This insecure pattern allows data intended to represent a file or directory path to alter command parsing when shell metacharacters are present. The behavior maps to CWE-78: Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection.
Potential impact
- An attacker may execute arbitrary operating system commands
- The web server account could be compromised
- Sensitive camera, event, or system data could be accessed or modified
- The application environment could be used for further lateral movement
- Availability or integrity of monitoring services could be disrupted
- An attacker may execute arbitrary operating system commands
- The web server account could be compromised
- Sensitive camera, event, or system data could be accessed or modified
- The application environment could be used for further lateral movement
- Availability or integrity of monitoring services could be disrupted
General mitigation guidance
Mitigation generally focuses on eliminating shell interpretation of user-controlled values and reducing the trust placed in export parameters.
Common defensive patterns include:
- Use direct process APIs with argument arrays instead of shell command strings
- Apply strict allowlists for permitted export formats, paths, and filenames
- Keep user-controlled values separate from executable command structure
- Canonicalize and validate filesystem paths against approved directories
- Run web workers with the minimum filesystem and operating system privileges
- Restrict access to event export functionality according to least privilege
- Add layered request validation and preserve CSRF protections
Mitigation generally focuses on eliminating shell interpretation of user-controlled values and reducing the trust placed in export parameters.
Common defensive patterns include:
- Use direct process APIs with argument arrays instead of shell command strings
- Apply strict allowlists for permitted export formats, paths, and filenames
- Keep user-controlled values separate from executable command structure
- Canonicalize and validate filesystem paths against approved directories
- Run web workers with the minimum filesystem and operating system privileges
- Restrict access to event export functionality according to least privilege
- Add layered request validation and preserve CSRF protections
How teams detect issues like this
Organizations can look for command injection risks through:
- Static analysis rules identifying
exec()or shell invocation with concatenated request data - Code review checks for user-controlled values entering command strings or subprocess calls
- Tests that verify export parameters are passed as isolated arguments rather than shell syntax
- Runtime monitoring for unexpected child processes launched by the web server
- Policy enforcement that prohibits shell execution for routine file archival operations
- Automated security review tools that flag untrusted input flows into operating system command APIs
Organizations can look for command injection risks through:
- Static analysis rules identifying
exec()or shell invocation with concatenated request data - Code review checks for user-controlled values entering command strings or subprocess calls
- Tests that verify export parameters are passed as isolated arguments rather than shell syntax
- Runtime monitoring for unexpected child processes launched by the web server
- Policy enforcement that prohibits shell execution for routine file archival operations
- Automated security review tools that flag untrusted input flows into operating system command APIs
