Waldo

Verified writeups for the Waldo machine of Hack The Box

Waldo

$ tldr LFI filter bypass → SSH key leak → capabilities (cap_dac_read_search)

·	·
Operating system	Linux
Difficulty	Medium
Vector	Web
IP	10.10.10.87
Retirement date	2018-12-15
Skills	LFI (Local File Inclusion) - Filter Bypass Obtaining a user’s SSH private key through the LFI Escaping from a container Restricted Shell Bypass Abusing Capabilities (cap_dac_read_search+ei) [Privilege Escalation]

Writeups

Language	Author	Format	Link
🇪🇸 ES	S4vitar	Vídeo	Open
🇬🇧 EN	0xdf	Texto	Open
🇬🇧 EN	IppSec	Vídeo	Open

Skill resources

Curated documentation for each technique listed in the Skills column above. Sources: HackTricks, GTFOBins, PortSwigger, etc.

Skill	Source	Link
Local File Inclusion (LFI)	HackTricks	Open
Local File Inclusion (LFI)	PayloadsAllTheThings	Open

Related skills worth mastering

Remote File Inclusion (RFI) · Remote Code Execution (RCE)

If you liked this machine, try

• Tabby — Linux, Easy
• Poison — Linux, Medium
• Timing — Linux, Medium
• Unicode — Linux, Medium
• CrimeStoppers — Linux, Hard

---

Comments & tips

Did the official writeup not work? Found a smarter trick? Share it here — comments live in GitHub Discussions.

Last updated: 2026-06-07