Gitea is an open-source version control system similar to GitHub, providing users with various features to manage repositories of source code efficiently. Developed and maintained by a community of contributors and organizations like the Go-Gitea Team, it has gained popularity for self-hosting. Users can use Gitea to manage their software development lifecycle, track issues, collaborate on code, and review changes in a secure environment. Being open-source, Gitea is adopted widely by enterprises seeking customizable solutions for their repositories. Gitea supports numerous platforms and is favored for its lightweight nature, installation easiness, and broad language support.
The vulnerability present in Gitea versions 1.22.1 through 1.27.0 allows for unauthenticated arbitrary file read attacks. This flaw occurs because the system initializes the go-org markup renderer without adequately replacing its default ReadFile callback function. Attackers can exploit this by using the #+INCLUDE directive in Org-mode markup, making calls to the repository markup endpoint of any public repository. This oversight allows reading and rendering of arbitrary files on the server that are accessible to the Gitea service user, posing significant risks.
The technical details reveal that the vulnerable endpoint involves the repository markup functionality, and an attacker can exploit the flaw by submitting specially crafted Org-mode markup content. The significant aspect of the vulnerability lies in its ability to enable an adversary to input a file path, like "/etc/passwd", through the markup function. The outcome of this exploitation is a successful read and exposure of potentially sensitive information, depending on the site's configuration and content. The manipulation of these file reads can be further amplified into critical data exposures or execution flows.
When an attacker effectively exploits this vulnerability, they could gain unauthorized access to arbitrary files accessible to the Gitea service user. This includes critical configuration files such as "app.ini", which contains sensitive information like internal tokens, OAuth keys, JWT secrets, and database credentials. Further, the exploitation could escalate into command execution through Git hook injection, amplifying the potential damage and loss of confidentiality, integrity, and availability of server data and operations.
REFERENCES
- Update Gitea to version 1.27.1 or later to patch and mitigate the vulnerability.
- Regularly review and audit your Gitea configurations for any unauthorized file access or modifications.
- Implement strict access control and filesystem permissions to minimize unauthorized access risks.
- Conduct routine vulnerability assessments and penetration tests on your self-hosted Gitea instances.
- Provision and use secure coding practices to handle dynamic content inclusions across various deployments.
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