CVE-2010-2524
HighSummary
Funkcjonalność rozwiązywania DNS w implementacji CIFS w jądrze Linux przed wersją 2.6.35, przy włączonym CONFIG_CIFS_DFS_UPCALL, polega na używaniu kluczy użytkownika dla wywołania dns_resolver w pomocniku cifs.upcall w przestrzeni użytkownika. To pozwala lokalnym użytkownikom na fałszowanie wyników zapytań DNS i wykonywanie dowolnych montażów CIFS.
Risk Assessment
Organizacja może być narażona na ataki, w których lokalni użytkownicy mogą manipulować wynikami zapytań DNS, co prowadzi do nieautoryzowanego dostępu do zasobów CIFS. To stwarza ryzyko wycieku danych oraz naruszenia integralności systemu.
Recommendation
Zaleca się aktualizację jądra Linux do wersji 2.6.35 lub nowszej, aby wyeliminować tę podatność. Dodatkowo, warto rozważyć ograniczenie dostępu do funkcji CIFS dla lokalnych użytkowników.
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Original NVD description (English source)
The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG_CIFS_DFS_UPCALL is enabled, relies on a user's keyring for the dns_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add_key call, related to a "cache stuffing" issue and MS-DFS referrals.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

