Exif
2 minutes to read
We are told to find the flag in this image:
However, the flag is not visible inside the image and it is not hidden in its content. However, we can find the flag in the file metadata.
We can extract metadata using exiftool:
$ exiftool Computer-Password-Security-Hacker\ -\ Copy.jpg
ExifTool Version Number : 12.30
File Name : Computer-Password-Security-Hacker - Copy.jpg
Directory : .
File Size : 54 KiB
File Modification Date/Time : -
File Access Date/Time : -
File Inode Change Date/Time : -
File Permissions : -rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.02
X Resolution : 100
Y Resolution : 100
Exif Byte Order : Big-endian (Motorola, MM)
Resolution Unit : None
Y Cb Cr Positioning : Centered
Exif Version : 0231
Components Configuration : Y, Cb, Cr, -
Flashpix Version : 0100
Owner Name : CTFlearn{3l1t3_3x1f_4uth0r1ty_dud3br0}
GPS Latitude Ref : South
GPS Longitude Ref : East
Quality : 60%
DCT Encode Version : 100
APP14 Flags 0 : [14], Encoded with Blend=1 downsampling
APP14 Flags 1 : (none)
Color Transform : YCbCr
Image Width : 660
Image Height : 371
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1)
Image Size : 660x371
Megapixels : 0.245
GPS Latitude : 77 deg 17' 2.62" S
GPS Longitude : 44 deg 4' 7.30" E
GPS Position : 77 deg 17' 2.62" S, 44 deg 4' 7.30" E
And there is the flag:
CTFlearn{3l1t3_3x1f_4uth0r1ty_dud3br0}