WebNet0

Problem

We found this packet capture and key. Recover the flag. You can also find the file in /problems/webnet0_0_363c0e92cf19b68e5b5c14efb37ed786.

• Packet Capture

• Key

Solution

1. Open in Wireshark

2. Go to Edit > Preferences > Protocols > TLS > RSA keys list

3. Add the key to the list (don't worry about ip and other columns)

4. Flag is in decrypted TLS section of the now visible HTTP packets

   HTTP/1.1 200 OK
   Date: Fri, 23 Aug 2019 15:56:36 GMT
   Server: Apache/2.4.29 (Ubuntu)
   Last-Modified: Mon, 12 Aug 2019 16:50:05 GMT
   ETag: "5ff-58fee50dc3fb0-gzip"
   Accept-Ranges: bytes
   Vary: Accept-Encoding
   Content-Encoding: gzip
   *Pico-Flag: picoCTF{nongshim.shrimp.crackers}*
   Content-Length: 821
   Keep-Alive: timeout=5, max=100
   Connection: Keep-Alive
   Content-Type: text/html

Flag

picoCTF{nongshim.shrimp.crackers}