Excellent Vista!
Table of Contents
Overview
- Solved by: @siunam
- 768 solves / 100 points
- Author: Yo_Yo_Bro
- Overall difficulty for me (From 1-10 stars): ★☆☆☆☆☆☆☆☆☆
Background
What a nice spot to stop,lookout and watch time go by, EXAMINE the image and discover where this was taken.
NOTE: Flag is case-insensitive and requires placing inside DUCTF{} wrapper! e.g DUCTF{Osint_Lookout}
Author: Yo_Yo_Bro
Find The Flag
In this challenge, we can download a file:
┌[siunam♥Mercury]-(~/ctf/DownUnderCTF-2023/osint/Excellent-Vista!)-[2023.09.04|22:59:51(HKT)]
└> file ExcellentVista.jpg
ExcellentVista.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=7, xresolution=2158, yresolution=2166, resolutionunit=2, GPS-Data], baseline, precision 8, 4032x3024, components 3
In an image file, it’s important that extracting the metadata of the file, as it might leaked some sensitive information, like GPS position:
┌[siunam♥Mercury]-(~/ctf/DownUnderCTF-2023/osint/Excellent-Vista!)-[2023.09.04|23:00:32(HKT)]
└> exiftool ExcellentVista.jpg
[...]
GPS Version ID : 2.3.0.0
GPS Latitude Ref : South
GPS Longitude Ref : East
GPS Altitude Ref : Above Sea Level
GPS Speed Ref : km/h
GPS Speed : 0
GPS Img Direction Ref : True North
GPS Img Direction : 122.5013812
GPS Dest Bearing Ref : True North
GPS Dest Bearing : 122.5013812
GPS Horizontal Positioning Error: 6.055886243 m
[...]
GPS Altitude : 70.5 m Above Sea Level
GPS Latitude : 29 deg 30' 34.33" S
GPS Longitude : 153 deg 21' 34.46" E
GPS Position : 29 deg 30' 34.33" S, 153 deg 21' 34.46" E
Nice! We found the GPS position where the image was taken!
Let’s convert that into Google Map format via ChatGPT:
- GPS position format:
-29.5095361, 153.3595722
Then query with that GPS position in Google Map:
Found it!
- Flag:
DUCTF{Durrangan_Lookout}
Conclusion
What we’ve learned:
- Extracting image’s metadata via
exiftool