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Gemini Executive Synthesis

Zero-click data loss vulnerability through environmental variable injection and insecure default scheduling.

Technical Positioning
Secure system interaction; preventing unauthorized data deletion; robust environment variable handling; secure default configurations.
SaaS Insight & Market Implications
This report uncovers a severe zero-click data-loss vulnerability in PureMac, stemming from a confluence of three critical weaknesses. First, `ScanEngine.scanBrewCache` fails to sanitize environment variables, allowing `HOMEBREW_CACHE` to be hijacked. Second, `CleaningEngine.isSafeToDelete` dangerously allow-lists entire user directories like `~/Documents` for deletion. Third, the `SchedulerService` unconditionally loads and activates a pre-seeded `ScheduleConfig` from `UserDefaults` before user onboarding. Combined, an attacker can pre-seed `UserDefaults` and set `HOMEBREW_CACHE` to a sensitive directory, leading to the automatic, unprompted deletion of critical user data upon application launch. This represents a catastrophic security failure, demonstrating a profound lack of secure design principles and posing an immediate threat to user data integrity and product credibility.
Proprietary Technical Taxonomy
zero-click data-loss HOMEBREW_CACHE env pre-seeded ScheduleConfig ScanEngine.scanBrewCache Process() sanitising env brew --cache brewCachePaths

Raw Developer Origin & Technical Request

Source Icon GitHub Issue Apr 16, 2026
Repo: momenbasel/PureMac
security: zero-click cache deletion via HOMEBREW_CACHE env + pre-seeded ScheduleConfig

### Summary
Three independent weaknesses compose into a zero-click data-loss chain:

1. `ScanEngine.scanBrewCache` spawns `brew --cache` with `Process()` without sanitising env. `brew` honours `HOMEBREW_CACHE` → attacker-controlled output flows into `brewCachePaths` → `removeItem`.
2. `CleaningEngine.isSafeToDelete` allow-lists `~/Downloads`, `~/Documents`, `~/Desktop` as whole-subtree deletable roots, so an attacker-chosen target like `\$HOME/Documents` passes.
3. `SchedulerService.init` loads `PureMac.ScheduleConfig` from UserDefaults before onboarding; `AppState.init` calls `scheduler.start()` unconditionally. A pre-written plist (`defaults write com.puremac.app …`) with `autoClean=true, nextRunDate=` triggers `cleanAll` within 60s of the next launch.

### Location
- `PureMac/Services/ScanEngine.swift` 279-338
- `PureMac/Services/CleaningEngine.swift` 111-139
- `PureMac/Services/SchedulerService.swift` 13-21
- `PureMac/ViewModels/AppState.swift` 71-79

### Evidence (runtime, macOS 26.4)
```
export HOMEBREW_CACHE=\$HOME/Documents
\$ /opt/homebrew/bin/brew --cache
/Users/victim/Documents ← attacker wins

# + pre-seeded ScheduleConfig.autoClean=true, nextRunDate=-1s
# → scheduler ticks in ≤60s → scanBrewCache emits CleanableItem path=\$HOME/Documents
# → isSafeToDelete(\$HOME/Documents) passes (Documents in allow-list)
# → removeItem wipes \$HOME/Documents
```
Full lab transcript: all three prereqs (`launchctl setenv`, `defaults write `, direct plist wr...

Developer Debate & Comments

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Adjacent Repository Pain Points

Other highly discussed features and pain points extracted from momenbasel/PureMac.

Extracted Positioning
Feature request for bulk selection and deletion of orphaned files, and clarification on scan accuracy.
Efficient and user-friendly cleanup; accurate identification of deletable files; transparent operation.
Extracted Positioning
Ineffective or non-functional application uninstallation feature.
Comprehensive and reliable application uninstallation; clear user feedback on deletion status.
Extracted Positioning
Inconsistent version reporting between download source and application's 'About' information.
Clear and accurate product versioning; professional software presentation.
Extracted Positioning
Allow-list bypass vulnerability due to incorrect path prefix matching without trailing slash.
Secure file system operations; accurate allow-list validation; preventing unauthorized file deletion.
Extracted Positioning
Time-of-check to time-of-use (TOCTOU) vulnerability in file deletion logic, allowing symlink-based allow-list bypass.
Secure file system operations; preventing unauthorized file deletion; robust symlink handling.

Frequently Asked Questions

Market intelligence mapped to Zero-click data loss vulnerability through environmental variable injection and insecure default scheduling..

What problem does Zero-click data loss vulnerability through environmental variable injection and insecure default scheduling. solve?
Based on our AI analysis of the original developer request, its primary technical positioning is: Secure system interaction; preventing unauthorized data deletion; robust environment variable handling; secure default configurations.
What architecture is tied to Zero-click data loss vulnerability through environmental variable injection and insecure default scheduling.?
Our proprietary extraction maps Zero-click data loss vulnerability through environmental variable injection and insecure default scheduling. to adjacent architectural concepts including zero-click data-loss, HOMEBREW_CACHE env, pre-seeded ScheduleConfig, ScanEngine.scanBrewCache.

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Cross-Market Term Frequency

Quantifies the cross-market adoption of foundational terms like onboarding and removeItem by tracking occurrence frequency across active SaaS architectures and enterprise developer debates.