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    CVE-2019-18840

    In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer overflow inside the DecodedCert structure in GetName in wolfcrypt/src/asn.c because the domain name location index is mishandled. Because a pointer is overwritten, there is an invalid free.

    Published:Nov 9, 2019
    Last Modified:Nov 21, 2024
    EPS:Nov 9, 2019
    EPSS Score:0.00411
    CVSS Score:7.5

    Affected Products

    Vendor
    Wolfssl
    Product
    Wolfssl

    Exploits

    https://github.com/wolfSSL/wolfssl/issues/2555https://github.com/wolfSSL/wolfssl/issues/2555

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High