CVE-2026-27750
HighSummary
Avira Internet Security zawiera podatność typu time-of-check time-of-use (TOCTOU) w komponencie Optymalizator. Usługa z uprawnieniami SYSTEM identyfikuje katalogi do usunięcia podczas fazy skanowania, a następnie usuwa je w osobnej fazie czyszczenia bez ponownej walidacji ścieżki docelowej.
Risk Assessment
Lokalny atakujący może zastąpić wcześniej zeskanowany katalog punktem połączenia lub punktem przetwarzania przed usunięciem, co może prowadzić do usunięcia chronionych plików lub katalogów. Może to skutkować eskalacją uprawnień lokalnych, odmową usługi lub naruszeniem integralności systemu.
Recommendation
Zaleca się monitorowanie i ograniczenie dostępu do komponentu Optymalizator oraz wdrożenie dodatkowych mechanizmów walidacji ścieżek przed usunięciem katalogów. Regularne aktualizacje oprogramowania mogą również pomóc w zabezpieczeniu przed tą podatnością.
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Original NVD description (English source)
Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component. A privileged service running as SYSTEM identifies directories for cleanup during a scan phase and subsequently deletes them during a separate cleanup phase without revalidating the target path. A local attacker can replace a previously scanned directory with a junction or reparse point before deletion occurs, causing the privileged process to delete an unintended system location. This may result in deletion of protected files or directories and can lead to local privilege escalation, denial of service, or system integrity compromise depending on the affected target.