Summary
A path traversal vulnerability in Gitea's Org-mode markup renderer allows an unauthenticated user to make the repository markup endpoint include server-side files. The risk is highest when a suitable public repository can trigger the renderer and the Gitea service account can read sensitive configuration or credential material.
A path traversal vulnerability in Gitea's Org-mode markup renderer allows an unauthenticated user to make the repository markup endpoint include server-side files. The risk is highest when a suitable public repository can trigger the renderer and the Gitea service account can read sensitive configuration or credential material.
Affected context
The vulnerability occurs in Gitea deployments that:
- Enable or process Org-mode markup through the repository markup endpoint
- Render attacker-influenced INCLUDE directives
- Permit the Gitea service account to access local files beyond the intended repository content
Exposure depends on endpoint availability, repository visibility and configuration, filesystem permissions, and whether sensitive files are readable by the service process.
The vulnerability occurs in Gitea deployments that:
- Enable or process Org-mode markup through the repository markup endpoint
- Render attacker-influenced INCLUDE directives
- Permit the Gitea service account to access local files beyond the intended repository content
Exposure depends on endpoint availability, repository visibility and configuration, filesystem permissions, and whether sensitive files are readable by the service process.
Exploit preconditions
- Attack surface: The repository markup rendering endpoint
- Required access: No authentication may be required when a suitable public repository is available
- Trigger point: Processing of an Org-mode INCLUDE directive during markup rendering
- Required permissions: The Gitea service account must be able to read the targeted file
- Why exploitation is possible: File inclusion is not sufficiently constrained to the intended repository or content directory
- Potential escalation condition: Disclosed configuration secrets, combined with access to an internal logger function capable of modifying Git hooks, may enable command execution as the Gitea service account
- Attack surface: The repository markup rendering endpoint
- Required access: No authentication may be required when a suitable public repository is available
- Trigger point: Processing of an Org-mode INCLUDE directive during markup rendering
- Required permissions: The Gitea service account must be able to read the targeted file
- Why exploitation is possible: File inclusion is not sufficiently constrained to the intended repository or content directory
- Potential escalation condition: Disclosed configuration secrets, combined with access to an internal logger function capable of modifying Git hooks, may enable command execution as the Gitea service account
Why this happens
The renderer accepts file references from markup content without reliably constraining their resolved paths to an approved directory or repository boundary. This is an instance of CWE-22: Improper Limitation of a Pathname to a Restricted Directory, commonly called path traversal.
The insecure pattern is treating a user-controlled include target as a trusted filesystem path. Path normalization, authorization, and allowlisting are either absent or insufficient, allowing the rendering process to access files available to the service account. Any subsequent use of disclosed secrets in privileged internal functionality can increase the impact.
The renderer accepts file references from markup content without reliably constraining their resolved paths to an approved directory or repository boundary. This is an instance of CWE-22: Improper Limitation of a Pathname to a Restricted Directory, commonly called path traversal.
The insecure pattern is treating a user-controlled include target as a trusted filesystem path. Path normalization, authorization, and allowlisting are either absent or insufficient, allowing the rendering process to access files available to the service account. Any subsequent use of disclosed secrets in privileged internal functionality can increase the impact.
Potential impact
- An attacker may read application configuration and other service-account-accessible files.
- Sensitive tokens, credentials, or deployment data could be disclosed.
- Repository confidentiality and integrity could be affected.
- An attacker could use disclosed secrets to access internal application functionality.
- Git hooks could potentially be modified, leading to command execution as the Gitea service account.
- The service account or connected systems could be used for further compromise.
- An attacker may read application configuration and other service-account-accessible files.
- Sensitive tokens, credentials, or deployment data could be disclosed.
- Repository confidentiality and integrity could be affected.
- An attacker could use disclosed secrets to access internal application functionality.
- Git hooks could potentially be modified, leading to command execution as the Gitea service account.
- The service account or connected systems could be used for further compromise.
General mitigation guidance
Mitigation generally focuses on eliminating filesystem access from user-controlled markup and enforcing a narrow content trust boundary.
Common defensive patterns include:
- Disable or remove server-side INCLUDE processing for untrusted markup.
- Resolve include paths against a fixed, allowlisted repository root and reject traversal, symlink escapes, absolute paths, and path normalization ambiguities.
- Apply authorization checks before every file read rather than relying only on repository visibility.
- Run rendering in a restricted worker with minimal filesystem access and a dedicated low-privilege identity.
- Keep application secrets outside broadly readable configuration files where practical, and limit access to required processes.
- Restrict internal logging and repository-management functions so they cannot modify executable repository metadata without authorization.
- Use read-only mounts and sandboxing for rendering workloads where feasible.
Mitigation generally focuses on eliminating filesystem access from user-controlled markup and enforcing a narrow content trust boundary.
Common defensive patterns include:
- Disable or remove server-side INCLUDE processing for untrusted markup.
- Resolve include paths against a fixed, allowlisted repository root and reject traversal, symlink escapes, absolute paths, and path normalization ambiguities.
- Apply authorization checks before every file read rather than relying only on repository visibility.
- Run rendering in a restricted worker with minimal filesystem access and a dedicated low-privilege identity.
- Keep application secrets outside broadly readable configuration files where practical, and limit access to required processes.
- Restrict internal logging and repository-management functions so they cannot modify executable repository metadata without authorization.
- Use read-only mounts and sandboxing for rendering workloads where feasible.
How teams detect issues like this
High-level detection approaches include:
- Static analysis rules for file reads whose paths are derived from markup, request parameters, repository content, or other untrusted sources.
- Code review checks for missing canonicalization, root-boundary validation, symlink handling, and authorization before file access.
- Runtime monitoring for unexpected reads of application configuration, credentials, system files, or paths outside repository storage.
- Web and application logs that identify unusual markup-rendering requests, repeated include failures, or access to sensitive path patterns.
- Policy enforcement preventing renderer processes from reading configuration, credential, and system directories.
- Automated security review tools can help identify tainted path flows and unsafe file-access patterns.
High-level detection approaches include:
- Static analysis rules for file reads whose paths are derived from markup, request parameters, repository content, or other untrusted sources.
- Code review checks for missing canonicalization, root-boundary validation, symlink handling, and authorization before file access.
- Runtime monitoring for unexpected reads of application configuration, credentials, system files, or paths outside repository storage.
- Web and application logs that identify unusual markup-rendering requests, repeated include failures, or access to sensitive path patterns.
- Policy enforcement preventing renderer processes from reading configuration, credential, and system directories.
- Automated security review tools can help identify tainted path flows and unsafe file-access patterns.
Sources
| Source | Link |
|---|---|
| blog. | blog.gitea.com/ |
| github. | github.com/ |
| github. | github.com/ |
| github. | github.com/ |
| github. | github.com/ |
| openwall. | openwall.com/ |
