CVE-2026-5477
HighSummary
W implementacji CMAC w wolfCrypt wystąpił przepełnienie całkowitej liczby, które mogło być wykorzystane do fałszowania tagów CMAC. Funkcja wc_CmacUpdate pomijała łańcuchowanie XOR dla pierwszego bloku, co prowadziło do błędnego odrzucenia stanu łańcucha CBC-MAC po osiągnięciu 4 GiB danych.
Risk Assessment
Organizacje mogą być narażone na ataki polegające na fałszowaniu tagów CMAC, co może prowadzić do nieautoryzowanego dostępu lub manipulacji danymi. Wspólne sufiksy wiadomości mogą umożliwić atakującym generowanie identycznych tagów CMAC.
Recommendation
Zaleca się aktualizację do najnowszej wersji wolfCrypt, aby usunąć problem z przepełnieniem oraz zapewnić, że XOR jest stosowane bezwarunkowo. Należy również przeprowadzić audyt aplikacji korzystających z tej biblioteki w celu wykrycia potencjalnych luk.
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Original NVD description (English source)
An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to forge CMAC tags. The function wc_CmacUpdate used the guard `if (cmac->totalSz != 0)` to skip XOR-chaining on the first block (where digest is all-zeros and the XOR is a no-op). However, totalSz is word32 and wraps to zero after 2^28 block flushes (4 GiB), causing the guard to erroneously discard the live CBC-MAC chain state. Any two messages sharing a common suffix beyond the 4 GiB mark then produce identical CMAC tags, enabling a zero-work prefix-substitution forgery. The fix removes the guard, making the XOR unconditional; the no-op property on the first block is preserved because digest is zero-initialized by wc_InitCmac_ex.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

