CVE-2025-70616
HighSummary
W systemie Wincor Nixdorf wnBios64.sys (wersja 1.2.0.0) występuje podatność na przepełnienie bufora stosu w obsłudze IOCTL dla kodu 0x80102058. Brak sprawdzania granic parametru Options, kontrolowanego przez użytkownika, umożliwia atakującemu z lokalnym dostępem wysłanie spreparowanego żądania IOCTL, co może prowadzić do wykonania kodu jądra lub eskalacji uprawnień.
Risk Assessment
Podatność ta stwarza ryzyko eskalacji uprawnień lokalnych oraz potencjalnego zdalnego wykonania kodu, co może prowadzić do poważnych konsekwencji dla bezpieczeństwa systemu. Dodatkowo, może ujawniać wrażliwe dane jądra, co zwiększa ryzyko dalszych ataków.
Recommendation
Zaleca się aktualizację sterownika wnBios64.sys do najnowszej wersji, która zawiera poprawki bezpieczeństwa. Należy również ograniczyć lokalny dostęp do systemu, aby zminimalizować ryzyko wykorzystania tej podatności.
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Original NVD description (English source)
A stack buffer overflow vulnerability exists in the Wincor Nixdorf wnBios64.sys kernel driver (version 1.2.0.0) in the IOCTL handler for code 0x80102058. The vulnerability is caused by missing bounds checking on the user-controlled Options parameter before copying data into a 40-byte stack buffer (Src[40]) using memmove. An attacker with local access can exploit this vulnerability by sending a crafted IOCTL request with Options > 40, causing a stack buffer overflow that may lead to kernel code execution, local privilege escalation, or denial of service (system crash). Additionally, the same IOCTL handler can leak kernel addresses and other sensitive stack data when reading beyond the buffer boundaries.

