CVE-2009-1895
HighSummary
Podsystem osobowości w jądrze Linux przed wersją 2.6.31-rc3 ma ustawienie PER_CLEAR_ON_SETID, które nie czyści flag ADDR_COMPAT_LAYOUT i MMAP_PAGE_ZERO podczas wykonywania programów setuid lub setgid. To ułatwia lokalnym użytkownikom wykorzystanie szczegółów użycia pamięci do przeprowadzenia ataków związanych z dereferencją wskaźnika NULL, obejścia mechanizmu ochrony mmap_min_addr lub pokonania losowości układu przestrzeni adresowej (ASLR).
Risk Assessment
Ryzyko dla organizacji polega na tym, że lokalni użytkownicy mogą wykorzystać tę podatność do przeprowadzenia ataków, które mogą prowadzić do nieautoryzowanego dostępu do pamięci lub obejścia zabezpieczeń systemowych.
Recommendation
Zaleca się aktualizację jądra Linux do wersji 2.6.31-rc3 lub nowszej, aby usunąć tę podatność oraz monitorowanie systemów w celu wykrywania potencjalnych prób wykorzystania tej luki.
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Original NVD description (English source)
The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID setting that does not clear the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags when executing a setuid or setgid program, which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL pointer dereference attacks, (2) bypass the mmap_min_addr protection mechanism, or (3) defeat address space layout randomization (ASLR).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

