UBUNTU-CVE-2021-45444

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    UBUNTU-CVE-2021-45444

    Published: 14 Feb 2022Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-45444
    Aliases:
    USN-5325-1

    Summary:

    Details: In zsh before 5.8.1, an attacker can achieve code execution if they control a command output inside the prompt, as demonstrated by a %F argument. This occurs because of recursive PROMPT_SUBST expansion.

    References: https://ubuntu.com/security/CVE-2021-45444, https://sourceforge.net/p/zsh/code/ci/c187154f47697cdbf822c2f9d714d570ed4a0fd1/, https://sourceforge.net/p/zsh/code/ci/fdb8b0ce6244ff26bf55e0fd825310a58d0d3156/, https://sourceforge.net/p/zsh/code/ci/bdc4d70a7e033b754e68a8659a037ea0fc5f38de/, https://ubuntu.com/security/notices/USN-5325-1, https://www.cve.org/CVERecord?id=CVE-2021-45444

    Affected packages

    Package

    Name: zsh

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.1.1-1ubuntu2.3+esm1

    Affected versions

    5.1.1-1ubuntu1
    5.1.1-1ubuntu2
    5.1.1-1ubuntu2.1
    5.1.1-1ubuntu2.2
    5.1.1-1ubuntu2.3

    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-2021-45444 | CVE-DB