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HackTheBox/Routerspace.md
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# HackTheBox - RouterSpace
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## NMAP
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```bash
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PORT STATE SERVICE VERSION
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22/tcp open ssh (protocol 2.0)
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| fingerprint-strings:
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| NULL:
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|_ SSH-2.0-RouterSpace Packet Filtering V1
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80/tcp open http
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| fingerprint-strings:
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| FourOhFourRequest:
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| HTTP/1.1 200 OK
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| X-Powered-By: RouterSpace
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| X-Cdn: RouterSpace-41677
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| Content-Type: text/html; charset=utf-8
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| Content-Length: 76
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| ETag: W/"4c-daU9QTsu+JmXzduj1YN/Vqx5tUc"
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| Date: Sun, 27 Feb 2022 16:02:12 GMT
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| Connection: close
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| Suspicious activity detected !!! {RequestID: xJG p RrjCI GYGF c VrTe l }
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| GetRequest:
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| HTTP/1.1 200 OK
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| X-Powered-By: RouterSpace
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| X-Cdn: RouterSpace-64002
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| Accept-Ranges: bytes
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| Cache-Control: public, max-age=0
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| Last-Modified: Mon, 22 Nov 2021 11:33:57 GMT
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| ETag: W/"652c-17d476c9285"
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| Content-Type: text/html; charset=UTF-8
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| Content-Length: 25900
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| Date: Sun, 27 Feb 2022 16:02:11 GMT
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```
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## PORT 80 (HTTP)
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The web server has a template page which has a download option
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<img src="https://i.imgur.com/n9klPP0.png"/>
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This will download `routerspace.apk`
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<img src="https://i.imgur.com/INlbPh1.png"/>
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Now here I ran into a rabbithole or should I say had trouble in setting up the environment, there are two routes in getting a foothold one being reversing the application but issue is that this is react application and it's code is obfuscated, by decompiling the apk with `apktool` we can find `index.android.bundle` file which will have the obfuscated javascript code, I did tried to deobfuscate but couldn't deobfuscated it properly
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<img src="https://i.imgur.com/jSmZo0K.png"/>
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<img src="https://i.imgur.com/AI3sNjR.png"/>
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<img src="https://i.imgur.com/JWPaxqW.png"/>
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We can use `js-beatufiy` to make the code a bit cleaner which can be installed through `npm`
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<img src="https://i.imgur.com/AEaIsUQ.png"/>
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<img src="https://i.imgur.com/HT72w5E.png"/>
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<img src="https://i.imgur.com/cxwyhCT.png"/>
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We do see some strings which tells the url but still I wasn't able to deobfuscate it and make the proper url or endpoint
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## Foothold
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Next was to run this application on android emulator, I like using `Genymotion` so setup a new device and make sure that you use android 7 because if your android version is above 7 you'll face an issue when you'll try to intercept the requests being made by this application. So using an android 7 device we installed the application using `adb`
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<img src="https://i.imgur.com/tiUboTb.png"/>
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<img src="https://i.imgur.com/fhqUbbg.png"/>
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Before running make sure to add a proxy setting to the WiFI access point
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<img src="https://i.imgur.com/SL1v6gw.png"/>
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Now run the application while having burpsuite to listen on all interfaces and intercept the request
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<img src="https://i.imgur.com/TnF1iuo.png"/>
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<img src="https://i.imgur.com/aDmKjEi.png"/>
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<img src="https://i.imgur.com/B3zJBjz.png"/>
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So we can do command injection here and get RCE, next we can just add our ssh public key in `/home/paul/.ssh/authorized_keys` file and login through ssh
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<img src="https://i.imgur.com/34VpBQp.png"/>
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Checking the source code of the application we can see why were able to command injection as it was executing it as a process
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<img src="https://i.imgur.com/BSnVJ8y.png"/>
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## Privilege Escalation
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So for escalating privileges I didn't find any thing that I could abuse or saw any cronjobs running, so only option I could think of was running `linpeas` but all outbound traffic was blocked as I couldn't transfer linpeas from my machine
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<img src="https://i.imgur.com/spDU4Gz.png"/>
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Copying the linpeas bash script and copy pasting it through clipboard was the only solution I could up with and then I ran the script which showed the sudoedit was vulnerable to a CVE know as `sudo Baron Samedit (CVE-2021-3156)`
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<img src="https://i.imgur.com/oAU4nCB.png"/>
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We can confrim that sudoedit is vulnerable as when we run sudoedit with `-s Y` it should not ask for password instead it should show us the usage options
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<img src="https://i.imgur.com/bwMZ7b3.png"/>
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But on the target machin it was asking for a password
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<img src="https://i.imgur.com/SljaPZ9.png"/>
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We can grab the exploit from here by copy pasting the exploit from clipboard
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<img src="https://github.com/blasty/CVE-2021-3156"/>
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<img src="https://i.imgur.com/su1iuuy.png"/>
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Running `id` command we can see that we are root
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<img src="https://i.imgur.com/uHwsdV5.png"/>
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## References
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- https://blog.assetnote.io/bug-bounty/2020/02/01/expanding-attack-surface-react-native/
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- https://github.com/blasty/CVE-2021-3156
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