CVE-2024-56731

Due to the insufficient patch for the CVE-2024-39931, it's still possible to delete files under the .git directory and achieve remote command execution.

Details

In the patch for CVE-2024-39931, the following check is added:
https://github.com/gogs/gogs/commit/77a4a945ae9a87f77e392e9066b560edb71b5de9

+	// 🚨 SECURITY: Prevent uploading files into the ".git" directory
+	if isRepositoryGitPath(opts.TreePath) {
+		return errors.Errorf("bad tree path %q", opts.TreePath)
+	}

While the above code snippet checks if the specified path is a .git directory, there are no checks for symbolic links in the later steps. So, by creating a symbolic link that points to the .git directory, an attacker can still delete arbitrary files in the .git directory and achieve remote command execution.

Unprivileged user accounts can execute arbitrary commands on the Gogs instance with the privileges of the account specified by RUN_USER in the configuration. It allows attackers to access and alter any users' code hosted on the same instance.

CVE-2024-56731 has a CVSS score of 10.0 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.13.3); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2024-56731? CVE-2024-56731 is a critical-severity security vulnerability in gogs.io/gogs (go), affecting versions <= 0.13.2. It is fixed in 0.13.3.
2. How severe is CVE-2024-56731? CVE-2024-56731 has a CVSS score of 10.0 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of gogs.io/gogs are affected by CVE-2024-56731? gogs.io/gogs (go) versions <= 0.13.2 is affected.
4. Is there a fix for CVE-2024-56731? Yes. CVE-2024-56731 is fixed in 0.13.3. Upgrade to this version or later.
5. Is CVE-2024-56731 exploitable, and should I be worried? Whether CVE-2024-56731 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-56731 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-56731? Upgrade gogs.io/gogs to 0.13.3 or later.