airlift

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airlift

An AirTraffic sandbox escape for iOS 27.0.

This is a simple proof-of-concept for developers and security researchers.

If you are worried about 🔥🪲4⃣☁️ (burning bugs for clout) - there are always more bugs

AirTraffic syncs media, including Books, from a Mac to iOS. airlift abuses that path to read and write files outside AirTraffic’s intended directory scope. It runs from a paired Mac over Wi-Fi or USB, with no iOS app required. Tested on iOS 27.0 RC (24A435); it should also work on iOS 27.0 final (24A437). Other iPhone builds are allowed with a warning.

Verified scope

Fresh-file writes were confirmed in the following directories:

/var/mobile
/var/mobile/Documents
/var/mobile/Library
/var/mobile/Library/Preferences
/var/mobile/Library/Caches
/var/mobile/Library/SpringBoard
/var/mobile/Library/SMS
/var/mobile/Library/Safari
/var/mobile/Containers
/var/mobile/Containers/Data/Application
/var/mobile/Containers/Shared/AppGroup
/var/tmp

Reads are indirect: a known file is moved into Media, read through AFC, and moved back.

As of now, this does not work on the MobileGestalt plist.

Components

──────────────── macOS ────────────────
MobileDevice.framework
↓
AirTrafficHost.framework

───────────────── iOS ─────────────────
com.apple.streaming_zip_conduit
↓
com.apple.afc
↓
com.apple.atc / AirTrafficDevice
↓
Books sync client
↓
ATLegacyAssetLink
↓
ATAirlock
↓
NSFileManager

ATAirlock path validation

Effective logic in -[ATAirlock processCompletedAsset:] for these Book assets:

// Books "Persistent ID" reaches asset.identifier without path validation.
NSString *source =
    [@"/var/mobile/Media/Airlock/Book"
        stringByAppendingPathComponent:asset.identifier];

// FileComplete.AssetPath controls asset.path.
NSString *destination =
    [[@"/var/mobile/Media/"
        stringByAppendingPathComponent:asset.path]
        stringByStandardizingPath];

// This checks the path string, not where a symlink resolves.
if (![destination hasPrefix:@"/var/mobile/Media/"])
    return;

// The source is unchecked and the destination follows ancestor symlinks.
[fileManager moveItemAtPath:source
                     toPath:destination
                      error:&error];

The unchecked source accepts .. components from a Books asset identifier. StreamingZip accepts the relative symlink while it is still contained in its extraction directory. The first move relocates it below Media; the second uses it as part of the destination and writes the payload outside Media.

The included PoC writes a random canary, verifies it, and removes it. Existing Books sync files are preserved and restored after the run.

Build and run

airlift lists compatible paired iPhones and asks which one to use. Pass a UDID with --device to skip the prompt. Failed runs include helper diagnostics; pass --verbose to include them on successful runs too.

make
./airlift.py

# Choose another destination.
./airlift.py --target /var/mobile/Library/Safari

The default destination is /var/mobile/Library/SpringBoard.