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    CVE-2020-28042

    ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.

    Published:Nov 1, 2020
    Last Modified:Nov 21, 2024
    EPS:Nov 1, 2020
    EPSS Score:0.26716
    CVSS Score:5.3

    Affected Products

    Vendor
    Servicestack
    Product
    Servicestack

    Exploits

    https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/https://github.com/z-bool/Venom-JWT

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    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