PicoCTF - information

Posted on | Post modified | In |

PicoCTF - information

tags: PicoCTF CTF Misc

Challenge: https://play.picoctf.org/practice/challenge/186?category=4&page=1

Background

ExifTool

Exploit

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$ exiftool cat.jpg
ExifTool Version Number         : 11.88
File Name                       : cat.jpg
Directory                       : .
File Size                       : 858 kB
File Modification Date/Time     : 2023:02:16 02:15:29+08:00
File Access Date/Time           : 2023:02:16 16:09:51+08:00
File Inode Change Date/Time     : 2023:02:16 12:31:32+08:00
File Permissions                : rwxrwxrwx
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.02
Resolution Unit                 : None
X Resolution                    : 1
Y Resolution                    : 1
Current IPTC Digest             : 7a78f3d9cfb1ce42ab5a3aa30573d617
Copyright Notice                : PicoCTF
Application Record Version      : 4
XMP Toolkit                     : Image::ExifTool 10.80
License                         : cGljb0NURnt0aGVfbTN0YWRhdGFfMXNfbW9kaWZpZWR9
Rights                          : PicoCTF
Image Width                     : 2560
Image Height                    : 1598
Encoding Process                : Baseline DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 2560x1598
Megapixels                      : 4.1

In License row, it’s obviously a base64 encoding string picoCTF{the_m3tadata_1s_modified}

Reference

picoCTF 2021: Forensics - information