CVE-2008-5521
HighSummary
Avira AntiVir w wersjach 7.9.0.36 oraz prawdopodobnie 7.8.1.28, w przypadku użycia Internet Explorer 6 lub 7, pozwala zdalnym atakującym na ominięcie wykrywania złośliwego oprogramowania w dokumencie HTML. Atakujący mogą to osiągnąć, umieszczając nagłówek MZ na początku oraz modyfikując nazwę pliku, aby miała brak rozszerzenia, rozszerzenie .txt lub .jpg.
Risk Assessment
Organizacja jest narażona na ryzyko infekcji złośliwym oprogramowaniem, które może nie zostać wykryte przez Avira AntiVir, co prowadzi do potencjalnych strat danych i naruszenia bezpieczeństwa. Atakujący mogą wykorzystać tę lukę do dostarczenia złośliwych plików bez wykrycia.
Recommendation
Zaleca się aktualizację oprogramowania Avira AntiVir do najnowszej wersji oraz monitorowanie i skanowanie wszystkich dokumentów HTML przed ich otwarciem. Dodatkowo, warto rozważyć zastosowanie dodatkowych warstw zabezpieczeń, takich jak filtry treści.
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Original NVD description (English source)
Avira AntiVir 7.9.0.36 and possibly 7.8.1.28, when Internet Explorer 6 or 7 is used, allows remote attackers to bypass detection of malware in an HTML document by placing an MZ header (aka "EXE info") at the beginning, and modifying the filename to have (1) no extension, (2) a .txt extension, or (3) a .jpg extension, as demonstrated by a document containing a CVE-2006-5745 exploit.