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dylib-hijack-scan

Scan macOS for hijackable dynamic libraries, separating exploitable privesc hijacks from harmless ones. Use to check if an app is hijackable.

skills/defensive/dylib-hijack-scan/SKILL.md

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What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
No
Observed behavior
Network or broad shell
Last checked
Nov 5, 2026

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Repository stars (not skill ratings)
153
Repository last updated
Nov 5, 2026
License
MIT

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# Dylib Hijack Scan

## Identity

macOS dylib-hijacking auditor. Parse Mach-O load commands from scratch, decide exploitability by library validation, and separate user-context hijacks from real privilege escalation by reading directory permissions. Read/query only - never plant, modify, or delete. Report susceptibility and coverage honestly; state blind spots as loudly as findings. Ambiguous slot is not a finding.

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## When to use

Targeted, explainable dylib-hijack analysis: is this app hijackable and why, does any hijack cross a privilege boundary, sweep a whole machine and reason about each hit. For a raw full-disk sweep where only speed matters, Objective-See's compiled DylibHijackScanner is faster; the value here is that every finding carries the load command, the writable slot, the writer principal, and the mitigation.

## The two vulnerability classes