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    2 vulnerabilities by GNU Guix

    CVE-2021-27851 (GCVE-0-2021-27851)

    Vulnerability from nvd – Published: 2021-04-26 15:35 – Updated: 2024-09-17 02:11
    VLAI
    Title
    Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'
    Summary
    A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’. It affects multi-user setups in which ’guix-daemon’ runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with `guix build`, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.
    Severity
    No CVSS data available.
    CWE
    • CWE-264 - Permissions, Privileges, and Access Controls
    Assigner
    References
    Impacted products
    Vendor Product Version
    GNU Guix guix-daemon Affected: v0.11.0-3298-g2608e40988 , < unspecified (custom)
    Affected: unspecified , < v1.2.0-75109-g94f0312546 (custom)
    		Create a notification for this product.
    Date Public
    2021-03-18 00:00
    Credits
    Nathan Nye of WhiteBeam Security
    Show details on NVD website
    To clipboard 

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    CVE-2021-27851 (GCVE-0-2021-27851)

    Vulnerability from cvelistv5 – Published: 2021-04-26 15:35 – Updated: 2024-09-17 02:11
    VLAI
    Title
    Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'
    Summary
    A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’. It affects multi-user setups in which ’guix-daemon’ runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with `guix build`, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.
    Severity
    No CVSS data available.
    CWE
    • CWE-264 - Permissions, Privileges, and Access Controls
    Assigner
    References
    Impacted products
    Vendor Product Version
    GNU Guix guix-daemon Affected: v0.11.0-3298-g2608e40988 , < unspecified (custom)
    Affected: unspecified , < v1.2.0-75109-g94f0312546 (custom)
    		Create a notification for this product.
    Date Public
    2021-03-18 00:00
    Credits
    Nathan Nye of WhiteBeam Security
    Show details on NVD website
    To clipboard 

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