Ghost Writer

An automated memo service saves whatever you write. The developers reused code from an older echo service, and old habits die hard.

Your mission: make the service do something it was never meant to do.

Binary Information:

Filename: ghost-writer
Size:     15,380 bytes (15 KB)
MD5:      bd164d6612c019152bd9e9545902a632
SHA1:     df5527fb91b3e76ee5c399ab59edcf153b3f421a
SHA256:   903f23a77e65a2f2e60a672e390da5a7fbc031409cb8100853be59a04a9331e3

Verify integrity after download:

md5sum ghost-writer && sha1sum ghost-writer && sha256sum ghost-writer

Environment:
- Architecture: x86 (32-bit)
- Stack protector: Disabled
- NX: Enabled
- PIE: Disabled
- RELRO: Partial
- Symbols: Not stripped

Tip: This service reminds you of Talk Back, but there might be more you can do...

Note: Download the binary for local analysis. It reads flag.txt from the current directory - use a dummy flag for testing. The real flag can only be captured by exploiting the live instance on the lab.