Summary
A high-severity OS command injection vulnerability in the D-Link DAP1160L web diagnostic endpoint allows attacker-controlled input to reach shell command processing.
If the endpoint is reachable and accepts untrusted input, an attacker may execute arbitrary operating-system commands with the privileges of the web service.
A high-severity OS command injection vulnerability in the D-Link DAP1160L web diagnostic endpoint allows attacker-controlled input to reach shell command processing.
If the endpoint is reachable and accepts untrusted input, an attacker may execute arbitrary operating-system commands with the privileges of the web service.
Affected context
The vulnerability occurs in the /htdocs/web/diagnostic.php endpoint of D-Link DAP1160L A1 firmware. It becomes risky when externally influenced values are incorporated into diagnostic commands without sufficient separation from the shell interpreter, particularly when the web interface is reachable by an attacker.
The vulnerability occurs in the /htdocs/web/diagnostic.php endpoint of D-Link DAP1160L A1 firmware. It becomes risky when externally influenced values are incorporated into diagnostic commands without sufficient separation from the shell interpreter, particularly when the web interface is reachable by an attacker.
Exploit preconditions
- Attack surface: The DAP1160L web management interface and its diagnostic endpoint
- Required access: Network access to the endpoint and any authentication or authorization required by the device
- Trigger point: Processing of attacker-controlled input by
/htdocs/web/diagnostic.php - Why exploitation is possible: Input containing shell metacharacters may alter command interpretation and cause additional operating-system commands to run
- Attack surface: The DAP1160L web management interface and its diagnostic endpoint
- Required access: Network access to the endpoint and any authentication or authorization required by the device
- Trigger point: Processing of attacker-controlled input by
/htdocs/web/diagnostic.php - Why exploitation is possible: Input containing shell metacharacters may alter command interpretation and cause additional operating-system commands to run
Why this happens
The underlying bug is an OS command injection condition mapped to CWE-78. The application passes insufficiently constrained user-controlled data into a shell command or command-construction path, allowing shell metacharacters to change the intended command structure. The insecure pattern is treating request data as command syntax rather than as a strictly validated argument.
The underlying bug is an OS command injection condition mapped to CWE-78. The application passes insufficiently constrained user-controlled data into a shell command or command-construction path, allowing shell metacharacters to change the intended command structure. The insecure pattern is treating request data as command syntax rather than as a strictly validated argument.
Potential impact
- An attacker may execute arbitrary commands on the device
- Device configuration or diagnostic data could be modified
- Network traffic or stored information could be exposed
- The device may be disrupted or rendered unavailable
- The compromised device could be used to affect other systems on its network
- An attacker may execute arbitrary commands on the device
- Device configuration or diagnostic data could be modified
- Network traffic or stored information could be exposed
- The device may be disrupted or rendered unavailable
- The compromised device could be used to affect other systems on its network
General mitigation guidance
Mitigation generally focuses on removing shell interpretation from diagnostic operations and reducing the trust placed in web request parameters.
Common defensive patterns include:
- Prefer direct process-execution APIs that pass arguments separately instead of invoking a shell
- Apply allowlist validation for diagnostic options and argument values
- Reject unexpected characters, formats, and command structures before processing
- Avoid concatenating request data into command strings
- Run management services with the minimum privileges required
- Restrict management interfaces to trusted networks and authenticated administrators
- Add layered authorization and isolation controls around diagnostic functionality
Mitigation generally focuses on removing shell interpretation from diagnostic operations and reducing the trust placed in web request parameters.
Common defensive patterns include:
- Prefer direct process-execution APIs that pass arguments separately instead of invoking a shell
- Apply allowlist validation for diagnostic options and argument values
- Reject unexpected characters, formats, and command structures before processing
- Avoid concatenating request data into command strings
- Run management services with the minimum privileges required
- Restrict management interfaces to trusted networks and authenticated administrators
- Add layered authorization and isolation controls around diagnostic functionality
How teams detect issues like this
Detection can combine source review, runtime monitoring, and interface policy checks:
- Use static analysis rules to identify shell invocation APIs and string concatenation involving request parameters
- Review diagnostic handlers for subprocess calls, command templates, and missing allowlist validation
- Monitor web-service child processes and command execution originating from management endpoints
- Log rejected inputs and unusual diagnostic requests without recording sensitive data
- Enforce code-review policies requiring non-shell process APIs and explicit argument validation
Automated security review tools may help identify command construction patterns, but findings should be verified against the application's execution flow.
Detection can combine source review, runtime monitoring, and interface policy checks:
- Use static analysis rules to identify shell invocation APIs and string concatenation involving request parameters
- Review diagnostic handlers for subprocess calls, command templates, and missing allowlist validation
- Monitor web-service child processes and command execution originating from management endpoints
- Log rejected inputs and unusual diagnostic requests without recording sensitive data
- Enforce code-review policies requiring non-shell process APIs and explicit argument validation
Automated security review tools may help identify command construction patterns, but findings should be verified against the application's execution flow.
