Summary
YouTransfer contains a path traversal vulnerability in its template-rendering functionality that may allow remote attackers to access files outside the intended template directory. The issue becomes risky when attacker-controlled path components are accepted without sufficient normalization and containment checks.
YouTransfer contains a path traversal vulnerability in its template-rendering functionality that may allow remote attackers to access files outside the intended template directory. The issue becomes risky when attacker-controlled path components are accepted without sufficient normalization and containment checks.
Affected context
The vulnerability affects YouTransfer deployments using the template-rendering functionality associated with the /settings/template endpoint or component. Risk depends on whether the endpoint is remotely reachable, how requests are authenticated, and whether the application process can read sensitive files outside the intended template location.
The vulnerability affects YouTransfer deployments using the template-rendering functionality associated with the /settings/template endpoint or component. Risk depends on whether the endpoint is remotely reachable, how requests are authenticated, and whether the application process can read sensitive files outside the intended template location.
Exploit preconditions
- Attack surface: The remotely reachable template-rendering functionality
- Required access: Network access to the affected endpoint; authentication requirements depend on deployment configuration
- Trigger point: Processing a request that supplies or influences a template path
- Why exploitation is possible: Insufficient validation, normalization, or directory-boundary enforcement may allow a path to resolve outside the intended template directory
- Attack surface: The remotely reachable template-rendering functionality
- Required access: Network access to the affected endpoint; authentication requirements depend on deployment configuration
- Trigger point: Processing a request that supplies or influences a template path
- Why exploitation is possible: Insufficient validation, normalization, or directory-boundary enforcement may allow a path to resolve outside the intended template directory
Why this happens
The underlying bug is an improper limitation of a pathname to a restricted directory, which maps to CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). The insecure pattern occurs when application-controlled or user-influenced path values are combined with filesystem paths without reliably canonicalizing the result and verifying that it remains within the permitted directory.
The underlying bug is an improper limitation of a pathname to a restricted directory, which maps to CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). The insecure pattern occurs when application-controlled or user-influenced path values are combined with filesystem paths without reliably canonicalizing the result and verifying that it remains within the permitted directory.
Potential impact
- An attacker may read sensitive application or operating-system files
- Credentials, configuration data, or deployment secrets could be exposed
- Application templates or other files may be disclosed or potentially altered if write operations are reachable
- Information disclosure could support follow-on attacks against the host or connected services
- An attacker may read sensitive application or operating-system files
- Credentials, configuration data, or deployment secrets could be exposed
- Application templates or other files may be disclosed or potentially altered if write operations are reachable
- Information disclosure could support follow-on attacks against the host or connected services
General mitigation guidance
Mitigation generally focuses on making template selection identifier-based rather than path-based and enforcing a strict filesystem boundary.
Common defensive patterns include:
- Resolve candidate paths canonically and verify they remain below the approved template directory
- Reject traversal indicators, absolute paths, symlinks, and unexpected path encodings where appropriate
- Prefer an allowlisted mapping of template identifiers to known files
- Keep template directories and sensitive files separated by filesystem permissions
- Run the application with the minimum filesystem and process privileges required
- Avoid exposing template-management functionality without appropriate authentication and authorization
Mitigation generally focuses on making template selection identifier-based rather than path-based and enforcing a strict filesystem boundary.
Common defensive patterns include:
- Resolve candidate paths canonically and verify they remain below the approved template directory
- Reject traversal indicators, absolute paths, symlinks, and unexpected path encodings where appropriate
- Prefer an allowlisted mapping of template identifiers to known files
- Keep template directories and sensitive files separated by filesystem permissions
- Run the application with the minimum filesystem and process privileges required
- Avoid exposing template-management functionality without appropriate authentication and authorization
How teams detect issues like this
Detection approaches include:
- Static analysis for user-controlled values passed to file and template APIs
- Code review checks for string concatenation or interpolation used to construct filesystem paths
- Verification that canonicalization occurs before directory-boundary checks
- Dynamic testing with traversal variants, encoded separators, absolute paths, and symlink-related cases
- Web-application firewall or gateway policies that monitor suspicious path components, while treating such controls as defense in depth
- Automated security review tools and dependency or endpoint scanners can help identify related path-handling patterns
Detection approaches include:
- Static analysis for user-controlled values passed to file and template APIs
- Code review checks for string concatenation or interpolation used to construct filesystem paths
- Verification that canonicalization occurs before directory-boundary checks
- Dynamic testing with traversal variants, encoded separators, absolute paths, and symlink-related cases
- Web-application firewall or gateway policies that monitor suspicious path components, while treating such controls as defense in depth
- Automated security review tools and dependency or endpoint scanners can help identify related path-handling patterns
Sources
| Source | Link |
|---|---|
| github. | github.com/ |
| github. | github.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
| vuldb. | vuldb.com/ |
