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    CVE-2020-11076

    In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

    Published:May 21, 2020
    Last Modified:Nov 21, 2024
    EPS:May 22, 2020
    EPSS Score:0.0137
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Puma
    Product
    Puma

    Exploits

    https://github.com/dentarg/cougar

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

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    References

    http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html
    https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22
    https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd
    https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h
    https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/
    http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html
    http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html
    https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22
    https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd
    https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h
    https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/

    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