CVE-2026-5503
CriticalSummary
W funkcji TLSX_EchChangeSNI, gałąź ctx->extensions ustawiała rozszerzenia bezwarunkowo, nawet gdy TLSX_Find zwracał NULL. To spowodowało, że TLSX_UseSNI dołączał publicName kontrolowany przez atakującego do współdzielonego WOLFSSL_CTX, gdy nie skonfigurowano wewnętrznego SNI.
Risk Assessment
Atakujący może wprowadzić złośliwe dane do kontekstu SSL, co może prowadzić do naruszenia integralności danych i potencjalnego przejęcia sesji. To stwarza poważne ryzyko dla bezpieczeństwa komunikacji w organizacji.
Recommendation
Zaleca się aktualizację do najnowszej wersji WOLFSSL, aby usunąć tę podatność. Należy również przeprowadzić audyt konfiguracji SNI w celu zapewnienia, że nie są używane nieprawidłowe lub nieautoryzowane wartości.
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Original NVD description (English source)
In TLSX_EchChangeSNI, the ctx->extensions branch set extensions unconditionally even when TLSX_Find returned NULL. This caused TLSX_UseSNI to attach the attacker-controlled publicName to the shared WOLFSSL_CTX when no inner SNI was configured. TLSX_EchRestoreSNI then failed to clean it up because its removal was gated on serverNameX != NULL. The inner ClientHello was sized before the pollution but written after it, causing TLSX_SNI_Write to memcpy 255 bytes past the allocation boundary.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS