UBUNTU-CVE-2020-10933

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    UBUNTU-CVE-2020-10933

    Published: 4 May 2020Last Modified: 22 Apr 2026
    Upstream:
    CVE-2020-10933
    Aliases:
    USN-4882-1

    Summary:

    Details: An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#read_nonblock(requested_size, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous value of the heap. This may expose possibly sensitive data from the interpreter.

    References: https://ubuntu.com/security/CVE-2020-10933, https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933/, https://github.com/ruby/ruby/commit/61b7f86248bd121be2e83768be71ef289e8e5b90, https://ubuntu.com/security/notices/USN-4882-1, https://www.cve.org/CVERecord?id=CVE-2020-10933

    Affected packages

    Package

    Name: ruby2.5

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.5.1-1ubuntu1.8

    Affected versions

    2.5.0~preview1-1ubuntu2
    2.5.0-4ubuntu1
    2.5.0-4ubuntu4
    2.5.0-5ubuntu1
    2.5.0-6ubuntu1
    2.5.1-1ubuntu1
    2.5.1-1ubuntu1.1
    2.5.1-1ubuntu1.2
    2.5.1-1ubuntu1.4
    2.5.1-1ubuntu1.5
    2.5.1-1ubuntu1.6
    2.5.1-1ubuntu1.7

    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
    UBUNTU-CVE-2020-10933 | CVE-DB