CVE-2013-3735
HighSummary
Silnik Zend w PHP przed wersją 5.4.16 RC1 oraz 5.5.0 przed RC2 nieprawidłowo określa, czy wystąpił błąd parsera, co pozwala atakującym zależnym od kontekstu na spowodowanie odmowy usługi (zużycie pamięci i awaria aplikacji) poprzez spreparowaną definicję funkcji.
Risk Assessment
Atakujący mogą wykorzystać tę podatność do zakłócenia działania aplikacji, co może prowadzić do przestojów w usługach i utraty dostępności dla użytkowników.
Recommendation
Zaleca się aktualizację PHP do najnowszej wersji oraz wdrożenie zabezpieczeń na poziomie systemu operacyjnego, takich jak uruchamianie wielu serwerów WWW z różnymi identyfikatorami użytkowników.
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Original NVD description (English source)
The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id.