What does Patch Diff Exploit do?

Patch Diff Exploit analyzes differences between patched and unpatched binary files to identify the exact vulnerability that was fixed, then supports development of proof-of-concept exploits for educational purposes and authorized security assessments. It guides reverse-engineering the bug class (integer overflow, race condition, out-of-bounds access, use-after-free) from code changes.

What binary diffing tools does this skill integrate with?

The skill integrates with BinDiff (Google 5.x+) for function-level diffing in IDA Pro and Ghidra, ghidriff (a headless CLI tool for Ghidra installable via pip), and Diaphora (a legacy IDA Pro plugin that requires a commercial license).

When should I NOT use this skill?

Do not use this skill against production systems without explicit written authorization from the system owner, as misuse is illegal. Also do not use it when the patch includes only mitigation hardening (like CFG enforcement) rather than actual bug fixes, since these won't reveal exploitable vulnerabilities.

What file formats does this skill accept as input?

Inputs include patched and unpatched binary files (Windows: ntoskrnl.exe, win32k.sys from MSU packages; Linux: vmlinux from .deb/.rpm packages), optional PDB symbol files or debuginfo packages, and target CVE or security advisory details.

What does the skill output after analysis?

Outputs include function-level diff reports with similarity scores, identification of newly added security checks (boundary validation, locks, reference counting), reverse-engineered bug classification, and working proof-of-concept code that triggers the vulnerability on unpatched versions while remaining safe on patched versions.

Skill

Reverse-engineer patches to find exploitable vulnerabilities

Name: Patch Diff Exploit
Availability: OnlineOnly
Author: zhaoxuya520

Turns a vendor patch into a located vulnerability by binary-diffing before/after builds, for authorized N-day research.

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Works with idaghidrabindiffgithub

zhaoxuya520

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Spark score

out of 100

Updated 17 days ago

Source checked Sep 3, 2026

Version 16.6.0

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Why it matters

Security researchers hire this skill to analyze vendor security patches by diffing patched and unpatched binaries, identify what vulnerability was fixed, reverse-engineer the bug class (race condition, integer overflow, UAF, OOB), and develop proof-of-concept exploits for authorized penetration testing or vulnerability research.

Outcomes

What it gets done

Extract and diff patched vs. unpatched binaries using BinDiff, ghidriff, or Diaphora to locate changed functions

Analyze new boundary checks, locks, or validation logic to reverse-engineer the original vulnerability type

Map patch patterns (spinlocks, overflow checks, refcount fixes) to exploit classes (race, integer overflow, UAF)

Generate and validate PoC exploits that crash unpatched versions while patched versions remain stable

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-patch-diff-exploit | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

Patch Diff Exploit

Diffs a vendor's patched and unpatched binaries to locate exactly which function changed, then infers the underlying bug class from the specific code the patch added - a bounds check, a lock, a zeroing call, and so on. It documents PoC patterns per bug class and cautions that diffs can be misleading across compiler or optimization changes. Use it for authorized N-day research: reproducing a disclosed vulnerability with no public PoC, triaging a patch cycle, or checking whether a slower branch still carries a fixed bug. It gates on explicit written authorization before touching a live target.

What it does

This skill turns a vendor security patch into a concrete, located vulnerability by diffing the patched and unpatched binaries. It defines a five-step flow: obtain the before/after binaries (Microsoft Update Catalog MSU/MSP packages for Windows, or .deb/.rpm packages for Linux distributions), align symbols between the two builds (using PDBs where available, or borrowing symbols from the older build when they are not), run a binary diff (BinDiff, ghidriff, or Diaphora), locate the changed functions by filtering to a medium match score (roughly 0.5-0.9, since identical functions reveal nothing and completely different ones are usually renames), and infer the bug class from what the patch added - a bounds check suggests an out-of-bounds read/write, a newly added lock suggests a race condition, an added RtlZeroMemory/memset suggests an uninitialized-memory leak, and so on. The skill maps roughly a dozen such patch patterns to their likely bug classes to speed up this inference step, then documents writing and validating a proof-of-concept against the unpatched build.

When to use - and when NOT to

Use it when a vendor advisory describes a fix without a public proof-of-concept and the task is to locate the fixed function precisely, when triaging a monthly patch cycle for the highest-value changes, or when checking whether a slower-moving branch or backport still carries a vulnerability that mainline already fixed. The skill itself gates on authorization: it requires the user to state the exact target, confirm written authorization and scope, and see the exact commands before anything is run against a live target - without that confirmation it stays read-only and defensive-guidance-only. It explicitly separates its own scope from a neighboring skill for porting symbols onto an unstripped binary (a different, non-exploitative task) and from separate skills for building a full exploit chain or weaponizing a finding against a network target. It should not be used to develop or deploy an exploit against a production system without that explicit, scoped authorization.

Capabilities

Extracts and aligns before/after Windows or Linux packages (MSU/MSP via expand.exe/dism, or .deb/.rpm via dpkg-deb/rpm2cpio) and their debug symbols.
Runs and interprets function-level binary diffs (BinDiff, ghidriff, Diaphora), filtering to the medium-match-score functions most likely to hold the fix.
Maps common patch patterns (added bounds checks, locks, zeroing, reference-count checks, pointer probes, access checks, tightened IOCTLs) to the vulnerability class they most likely closed.
Documents PoC construction patterns for each inferred bug class (boundary values for integer overflow, concurrent hammering for races, spray-free-reuse for use-after-free, precise length/index control for out-of-bounds) and validating that the PoC reproduces on the unpatched build and not on the patched one.
Names specific caveats: a patch may only shrink the attack surface rather than fully fix the bug, cosmetic renames can look like large diffs, and compiler/optimization-level changes between major versions can distort a diff unrelated to the actual fix.

Who it's for

Authorized security researchers and red teams turning a disclosed-but-undetailed patch into a verified, reproducible finding - within written, scoped authorization such as a bug bounty, CTF, or an organization's own lab systems.

FAQ

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