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CVE-2022-38153

Status Candidate

Overview

An issue was discovered in wolfSSL before 5.5.0 (when --enable-session-ticket is used); however, only version 5.3.0 is exploitable. 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 (more than 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 that points to unallocated memory, causing the client to crash with a "free(): invalid pointer" message. NOTE: It is likely that this is also exploitable during 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.

Related Files

wolfSSL 5.3.0 Denial Of Service
Posted Jan 20, 2023
Authored by Maximilian Ammann

In 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.

tags | advisory, denial of service, fuzzer
advisories | CVE-2022-38153
SHA-256 | f59468b21298c1c33414e91a82538602ac9464e204528dd890a517426df539a3
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