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    CVE-2019-18792

    An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

    Published:Jan 6, 2020
    Last Modified:Nov 21, 2024
    EPS:Jan 6, 2020
    EPSS Score:0.00249
    CVSS Score:9.1

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Oisf
    Product
    Suricata

    Exploits

    https://redmine.openinfosecfoundation.org/issues/3324https://redmine.openinfosecfoundation.org/issues/3394https://redmine.openinfosecfoundation.org/issues/3324https://redmine.openinfosecfoundation.org/issues/3394

    Common Weakness Enumeration

    CWE-436 Interpretation Conflict

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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