wolfSSL versions prior to 5.5.2 suffer from a heap buffer over-read with WOLFSSL_CALLBACKS and can be triggered with a single Client Hello message.
22c8bd75668677a45f903b9289dfd4de5cffd44e8f21af11820559278a985e59In wolfSSL version 5.3.0, man-in-the-middle attackers or a malicious server can crash TLS 1.2 clients during a handshake. If an attacker injects a large ticket (above 256 bytes) into a NewSessionTicket message in a TLS 1.2 handshake, and the client has a non-empty session cache, the session cache frees a pointer which points to non-allocated memory, causing the client to crash with a “free(): invalid pointer”. Note: It is likely that this is also exploitable in TLS 1.3 handshakes between a client and a malicious server. With TLS 1.3 it is not possible to exploit this as a man-in-the-middle. This bug was discovered using the novel symbolic-model-guided fuzzer tlspuffin.
f59468b21298c1c33414e91a82538602ac9464e204528dd890a517426df539a3wolfSSL versions prior to 5.5.0 suffer from a denial of service condition related to session resumption. When a TLS 1.3 client connects to a wolfSSL server and SSL_clear is called on its session, the server crashes with a segmentation fault. The bug occurs after a client performs a handshake against a wolfSSL server and then closes the connection. If the server reuses the previous session structure (struct WOLFSSL) by calling wolfSSL_clear(WOLFSSL* ssl) on it, the next received Client Hello, which resumes the previous session, crashes the server. Note, that this bug only exists in resumed handshakes using TLS session resumption. This bug was discovered using the novel symbolic-model-guided fuzzer tlspuffin.
1b9325efbf39604c8462f0298d0d79f674ddf2937457ea4559d7da387dd41a30In wolfSSL versions prior to 5.5.1, malicious clients can cause a buffer overflow during a resumed TLS 1.3 handshake. If an attacker resumes a previous TLS session by sending a maliciously crafted Client Hello, followed by another maliciously crafted Client Hello. In total 2 Client Hellos have to be sent. One which pretends to resume a previous session and a second one as a response to a Hello Retry Request message.
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