CVE-2023-6935

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    CVE-2023-6935

    Published: 9 Feb 2024Last Modified: 28 Oct 2026

    Summary: Marvin Attack vulnerability in SP Math All RSA

    Details: wolfSSL SP Math All RSA implementation is vulnerable to the Marvin Attack, new variation of a timing Bleichenbacher style attack, when built with the following options to configure: --enable-all CFLAGS="-DWOLFSSL_STATIC_RSA" The define “WOLFSSL_STATIC_RSA” enables static RSA cipher suites, which is not recommended, and has been disabled by default since wolfSSL 3.6.6.  Therefore the default build since 3.6.6, even with "--enable-all", is not vulnerable to the Marvin Attack. The vulnerability is specific to static RSA cipher suites, and expected to be padding-independent. The vulnerability allows an attacker to decrypt ciphertexts and forge signatures after probing with a large number of test observations. However the server’s private key is not exposed.

    References: https://www.wolfssl.com/docs/security-vulnerabilities/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6935.json, https://nvd.nist.gov/vuln/detail/CVE-2023-6935, https://people.redhat.com/~hkario/marvin/, https://github.com/wolfSSL/wolfssl

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 182028819d5d1b3beeea15a3f3117a06608b62b0
    Fixed -None

    Affected versions

    v5.6.4-stable
    v5.6.2-stable
    v5.6.3-stable
    v5.6.0-stable

    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