Summary
A vulnerability in the employee photo upload workflow of php-travel-agency-system may allow remote attackers to upload files without adequate type, content, or execution controls. Depending on server configuration and upload handling, an attacker could place executable or otherwise harmful files in a reachable location.
A vulnerability in the employee photo upload workflow of php-travel-agency-system may allow remote attackers to upload files without adequate type, content, or execution controls. Depending on server configuration and upload handling, an attacker could place executable or otherwise harmful files in a reachable location.
Affected context
The issue affects deployments that expose the employee creation functionality in
admin/employee_insert.php and process the employee photo parameter without
sufficiently restricting uploaded content. Risk is greater when uploaded files
are stored in web-accessible directories, retain attacker-controlled names or
extensions, or can be interpreted by the server as executable content.
The issue affects deployments that expose the employee creation functionality in
admin/employee_insert.php and process the employee photo parameter without
sufficiently restricting uploaded content. Risk is greater when uploaded files
are stored in web-accessible directories, retain attacker-controlled names or
extensions, or can be interpreted by the server as executable content.
Exploit preconditions
- Attack surface: The remotely accessible employee insertion and photo upload workflow
- Required access: Access sufficient to reach the affected administrative or application endpoint; the exact authentication requirement depends on deployment controls
- Trigger point: Processing and storage of the
employee photoupload argument - Why exploitation is possible: The upload path may accept attacker-controlled files without enforcing robust content validation, safe storage, and execution restrictions
- Attack surface: The remotely accessible employee insertion and photo upload workflow
- Required access: Access sufficient to reach the affected administrative or application endpoint; the exact authentication requirement depends on deployment controls
- Trigger point: Processing and storage of the
employee photoupload argument - Why exploitation is possible: The upload path may accept attacker-controlled files without enforcing robust content validation, safe storage, and execution restrictions
Why this happens
The underlying issue is inadequate authorization and upload handling around a file
upload parameter. When an application trusts client-controlled filenames, MIME types,
extensions, or file contents, an attacker may submit content outside the intended
image format. This maps primarily to CWE-434: Unrestricted Upload of File with Dangerous Type, with CWE-284: Improper Access Control relevant when endpoint
authorization or permission checks are insufficient.
The underlying issue is inadequate authorization and upload handling around a file
upload parameter. When an application trusts client-controlled filenames, MIME types,
extensions, or file contents, an attacker may submit content outside the intended
image format. This maps primarily to CWE-434: Unrestricted Upload of File with Dangerous Type, with CWE-284: Improper Access Control relevant when endpoint
authorization or permission checks are insufficient.
Potential impact
- An attacker may upload arbitrary files to the application server
- Uploaded content could be served to users or used for phishing
- Server-side execution could occur if the upload location permits script execution
- Application data or administrative functions could be compromised
- The vulnerability could enable persistence or further attacks against connected systems
- An attacker may upload arbitrary files to the application server
- Uploaded content could be served to users or used for phishing
- Server-side execution could occur if the upload location permits script execution
- Application data or administrative functions could be compromised
- The vulnerability could enable persistence or further attacks against connected systems
General mitigation guidance
Mitigation generally focuses on reducing trust in upload requests and separating
uploaded content from executable application resources.
Common defensive patterns include:
- Allowing only narrowly defined image formats based on verified file content
- Re-encoding accepted images rather than preserving attacker-supplied content
- Generating server-side filenames and ignoring user-controlled extensions
- Storing uploads outside web-accessible and executable directories where feasible
- Applying authorization checks and least-privilege filesystem permissions
- Enforcing request size limits and rejecting unexpected archive or script content
- Configuring the web server to disable script execution in upload locations
Mitigation generally focuses on reducing trust in upload requests and separating
uploaded content from executable application resources.
Common defensive patterns include:
- Allowing only narrowly defined image formats based on verified file content
- Re-encoding accepted images rather than preserving attacker-supplied content
- Generating server-side filenames and ignoring user-controlled extensions
- Storing uploads outside web-accessible and executable directories where feasible
- Applying authorization checks and least-privilege filesystem permissions
- Enforcing request size limits and rejecting unexpected archive or script content
- Configuring the web server to disable script execution in upload locations
How teams detect issues like this
Detection approaches can include:
- Static analysis for upload handlers that trust client-supplied MIME types, names, or extensions
- Code review checks for missing authorization and weak content validation around file inputs
- Runtime monitoring of newly created files in upload directories, especially executable files
- Web-server policy checks confirming that upload directories cannot execute scripts
- Alerting on unusual upload volume, file types, filenames, or access patterns
- Automated security review tools that identify unrestricted upload and access-control weaknesses
Detection approaches can include:
- Static analysis for upload handlers that trust client-supplied MIME types, names, or extensions
- Code review checks for missing authorization and weak content validation around file inputs
- Runtime monitoring of newly created files in upload directories, especially executable files
- Web-server policy checks confirming that upload directories cannot execute scripts
- Alerting on unusual upload volume, file types, filenames, or access patterns
- Automated security review tools that identify unrestricted upload and access-control weaknesses
Sources
| Source | Link |
|---|---|
| github. | github.com/ |
| github. | github.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
