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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

No active discussions extracted for this entry yet.

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.
Top Replies
yanfosec • Apr 15, 2026
Just want to up-vote this. Would be a great enhancement.
oleksiibielai • Apr 16, 2026
For me Start Scan reports that 2.53 GB was freed and Scan Again reports exactly the same size. It doesn't remove anything even after Full Disk Access was explicitly granted. At least I was able to ...
telepati • Apr 16, 2026
Yeah, this enhancement would be great. But, I have also consideration how much safe the deletes all orphaned files? Because when I examined them, I saw that some files were associated with applicat...
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.

Engagement Signals

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Issue Status

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.