CVE-2025-49600
MediumCVSS 4.9Summary
W MbedTLS w wersjach od 3.3.0 do 3.6.4, funkcja mbedtls_lms_verify może akceptować nieprawidłowe podpisy, jeśli obliczenie hasha nie powiedzie się, a wewnętrzne błędy nie są sprawdzane. To umożliwia fałszowanie podpisów LMS w scenariuszach z błędami sprzętowymi.
Risk Assessment
Organizacja może być narażona na akceptację nieprawidłowych podpisów, co prowadzi do potencjalnych oszustw i naruszeń integralności danych. Atakujący mogą wykorzystać tę podatność do obejścia weryfikacji podpisów.
Recommendation
Zaleca się aktualizację MbedTLS do wersji 3.6.4 lub nowszej, aby usunąć tę podatność. Dodatkowo, należy monitorować i zabezpieczać sprzętowe akceleratory haszujące przed atakami typu fault injection.
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Original NVD description (English source)
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault scenario. Specifically, unchecked return values in mbedtls_lms_verify allow an attacker (who can induce a hardware hash accelerator fault) to bypass LMS signature verification by reusing stale stack data, resulting in acceptance of an invalid signature. In mbedtls_lms_verify, the return values of the internal Merkle tree functions create_merkle_leaf_value and create_merkle_internal_value are not checked. These functions return an integer that indicates whether the call succeeded or not. If a failure occurs, the output buffer (Tc_candidate_root_node) may remain uninitialized, and the result of the signature verification is unpredictable. When the software implementation of SHA-256 is used, these functions will not fail. However, with hardware-accelerated hashing, an attacker could use fault injection against the accelerator to bypass verification.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

