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    CVE-2021-27217

    An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

    Published:Mar 4, 2021
    Last Modified:Nov 21, 2024
    EPS:Mar 4, 2021
    EPSS Score:0.00615
    CVSS Score:4.4

    Affected Products

    Vendor
    Yubico
    Product
    Yubihsm-shell

    Exploits

    https://blog.inhq.net/posts/yubico-libyubihsm-vuln2https://blog.inhq.net/posts/yubico-libyubihsm-vuln2

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    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