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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

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We regularly publish simple, beginner-friendly or educational CTF challenges!

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Today's Challenge
tan90909090tan90909090
Auxiliary vectors are our friends
Pwn
Hard
38 solves
Submissions (latest 3)
roaris

SOLVED!

Nov 6, 4:06 PM

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,357 solves
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Rows:

permission denied 3

Topic: File PermissionReleased: May 7, 2026

123 solves
Misc
Medium5.5

by

minaminao

minaminao

cat: flag.txt: No such file or directory

Beginner Hint 1 (AI-translated)
  • When you connect with nc, you'll see that a shell is launched.
  • Reading chal.sh, you can see that flag.txt is created with permission 400 before the shell starts.
  • Then all files in the current directory are deleted by rm *.
  • After that, a shell is launched via sh.
  • Of course, running cat flag.txt results in No such file or directory, so you can't read the flag directly.
  • So, how can you read the flag?
Beginner Hint 2 (AI-translated)
  • flag.txt is completely gone, but it wasn't the only file that contained the flag.
  • Think about chal.sh, which also contained the flag.
permission-denied-3.tar.gz

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