Individual skill
bypassing-restricted-shells
Escaping restricted shells (rbash, rksh, lshell), chroot jails, and language sandboxes (Lua, Python) during authorized engagements, plus bypassing command filters and bad-character / WAF restrictions to obtain arbitrary command execution from a constrained shell environment.
internal/tools/skills/data/linux-hardening/bypassing-restricted-shells/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Last checked
- Nov 7, 2026
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- Repository stars (not skill ratings)
- 1,313
- Repository last updated
- Nov 7, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- linux Declared skill tag
- restricted-shell Declared skill tag
- jailbreak Declared skill tag
- chroot Declared skill tag
- testing Derived category
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Read excerpt
# Bypassing Restricted Shells
## When to Use
- After landing in a restricted shell (`rbash`, `rksh`, `lshell`, custom menu shells) where `cd`, `/`, `>`, and PATH changes are blocked
- When a chroot jail confines the filesystem view and you need to reach the real root FS
- When command-injection input is filtered (spaces stripped, keywords blocked, character allowlists)
- When stuck inside a language sandbox (Lua, Python) reachable from an application
- During post-exploitation when an interactive shell needs to be upgraded from a limited binary
## Critical: Techniques Most Often Missed
Restricted-shell assessments fail when the tester tries one escape, hits a block, and assumes the jail is solid. Always run the full matrix.
