UBUNTU-CVE-2021-41556

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    UBUNTU-CVE-2021-41556

    Published: 28 Jul 2022Last Modified: 1 Jun 2026
    Upstream:
    CVE-2021-41556

    Summary:

    Details: sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that can lead to Code Execution. If a victim executes an attacker-controlled squirrel script, it is possible for the attacker to break out of the squirrel script sandbox even if all dangerous functionality such as File System functions has been disabled. An attacker might abuse this bug to target (for example) Cloud services that allow customization via SquirrelScripts, or distribute malware through video games that embed a Squirrel Engine.

    References: https://ubuntu.com/security/CVE-2021-41556, https://github.com/albertodemichelis/squirrel/commit/23a0620658714b996d20da3d4dd1a0dcf9b0bd98, https://blog.sonarsource.com/squirrel-vm-sandbox-escape/, http://www.squirrel-lang.org/#download, https://www.cve.org/CVERecord?id=CVE-2021-41556

    Affected packages

    Package

    Name: squirrel3

    Purl: pkg:deb/ubuntu/squirrel3?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.1-4

    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-2021-41556 | CVE-DB