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    CVE-2021-43557

    The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains "^/internal/", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.

    Published:Nov 22, 2021
    Last Modified:Nov 21, 2024
    EPS:Nov 22, 2021
    EPSS Score:0.35995
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Apisix

    Exploits

    http://www.openwall.com/lists/oss-security/2021/11/23/1https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hhttp://www.openwall.com/lists/oss-security/2021/11/23/1https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7hhttps://github.com/xvnpw/k8s-CVE-2021-43557-poc

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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