mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-21 02:23:30 +00:00
79 lines
4.9 KiB
Markdown
79 lines
4.9 KiB
Markdown
|
|
|
|
<details>
|
|
|
|
<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
|
|
|
|
- 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/carlospolopm)**.**
|
|
|
|
- **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)**.
|
|
|
|
</details>
|
|
|
|
|
|
# **TTL Manipulation**
|
|
|
|
Send some packets with a TTL enough to arrive to the IDS/IPS but not enough to arrive to the final system. And then, send another packets with the same sequences as the other ones so the IPS/IDS will think that they are repetitions and won't check them, but indeed they are carrying the malicious content.
|
|
|
|
**Nmap option:** `--ttlvalue <value>`
|
|
|
|
# Avoiding signatures
|
|
|
|
Just add garbage data to the packets so the IPS/IDS signature is avoided.
|
|
|
|
**Nmap option:** `--data-length 25`
|
|
|
|
# **Fragmented Packets**
|
|
|
|
Just fragment the packets and send them. If the IDS/IPS doesn't have the ability to reassemble them, they will arrive to the final host.
|
|
|
|
**Nmap option:** `-f`
|
|
|
|
# **Invalid** _**checksum**_
|
|
|
|
Sensors usually don't calculate checksum for performance reasons. __ So an attacker can send a packet that will be **interpreted by the sensor but rejected by the final host.** Example:
|
|
|
|
Send a packet with the flag RST and a invalid checksum, so then, the IPS/IDS may thing that this packet is going to close the connection, but the final host will discard the packet as the checksum is invalid.
|
|
|
|
# **Uncommon IP and TCP options**
|
|
|
|
A sensor might disregard packets with certain flags and options set within IP and TCP headers, whereas the destination host accepts the packet upon receipt.
|
|
|
|
# **Overlapping**
|
|
|
|
It is possible that when you fragment a packet, some kind of overlapping exists between packets (maybe first 8 bytes of packet 2 overlaps with last 8 bytes of packet 1, and 8 last bytes of packet 2 overlaps with first 8 bytes of packet 3). Then, if the IDS/IPS reassembles them in a different way than the final host, a different packet will be interpreted.\
|
|
Or maybe, 2 packets with the same offset comes and the host has to decide which one it takes.
|
|
|
|
* **BSD**: It has preference for packets with smaller _offset_. For packets with same offset, it will choose the first one.
|
|
* **Linux**: Like BSD, but it prefers the last packet with the same offset.
|
|
* **First** (Windows): First value that comes, value that stays.
|
|
* **Last** (cisco): Last value that comes, value that stays.
|
|
|
|
# Tools
|
|
|
|
* [https://github.com/vecna/sniffjoke](https://github.com/vecna/sniffjoke)
|
|
|
|
|
|
<details>
|
|
|
|
<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
|
|
|
|
- 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/carlospolopm)**.**
|
|
|
|
- **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)**.
|
|
|
|
</details>
|
|
|
|
|