PicoCTF-2019 Writeup
  • HHousen PicoCTF-2019 Writeup
  • Binary Exploitation
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    • asm1
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  • Challenge Name
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  1. Forensics

WebNet1

Previousm00nwalk 2NextWhitePages

Last updated 4 years ago

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Problem

We found this packet capture and key. Recover the flag. You can also find the file in /problems/webnet1_0_d63b267c607b8fedbae100068e010422.

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 JPEG JFIF packet Reassembled SSL section

TTP/1.1 200 OK
Date: Fri, 23 Aug 2019 16:27:04 GMT
Server: Apache/2.4.29 (Ubuntu)
Last-Modified: Fri, 23 Aug 2019 16:26:33 GMT
ETag: "112fb-590cb44f2cbe6"
Accept-Ranges: bytes
Content-Length: 70395
Pico-Flag: picoCTF{this.is.not.your.flag.anymore}
Keep-Alive: timeout=5, max=99
Connection: Keep-Alive
Content-Type: image/jpeg

ÿØÿàJFIFÿáExifMM*JR(;ZpicoCTF{honey.roasted.peanuts}ÿâICC_PROFILElcmsmntrRGB XYZ Ü)9acspAPPLöÖÓ-lcms

Flag

picoCTF{honey.roasted.peanuts}

Packet Capture
Key