Haircut

Verified writeups for the Haircut machine of Hack The Box

Haircut

$ tldr SSRF curl upload → command injection → GNU Screen 4.5.0 privesc

·	·
Operating system	Linux
Difficulty	Medium
Vector	Web
IP	10.10.10.24
Retirement date	2020-09-10
Skills	SSRF Attack (Server Side Request Forgery) Abusing a Curl implementation - Upload malicious PHP file Command Injection - Alternative Exploitation GNU Screen 4.5.0 - Local Privilege Escalation

Writeups

Language	Author	Format	Link
🇪🇸 ES	S4vitar	Vídeo	Open
🇪🇸 ES	El Pingüino de Mario	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
OS Command Injection	PortSwigger	Open
Server-Side Request Forgery	HackTricks	Open

Related skills worth mastering

Remote Code Execution (RCE) · Cross-Site Scripting (XSS)

If you liked this machine, try

• Forge — Linux, Medium
• Fortune — Linux, Insane
• Love — Windows, Easy
• Minion — Windows, Insane
• FluxCapacitor — Linux, Medium

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Last updated: 2026-06-07