PicoCTF - information
tags: PicoCTF CTF Misc
Challenge: https://play.picoctf.org/practice/challenge/186?category=4&page=1
Background
Exploit
$ 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}