Debian: DSA-4735-1: grub2 security update

    Date 29 Jul 2020
    148
    Posted By LinuxSecurity Advisories
    Several vulnerabilities have been discovered in the GRUB2 bootloader. CVE-2020-10713
    
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    Debian Security Advisory DSA-4735-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                        Yves-Alexis Perez
    July 29, 2020                         https://www.debian.org/security/faq
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    Package        : grub2
    CVE ID         : CVE-2020-10713 CVE-2020-14308 CVE-2020-14309 CVE-2020-14310
                     CVE-2020-14311 CVE-2020-15706 CVE-2020-15707
    
    Several vulnerabilities have been discovered in the GRUB2 bootloader.
    
    CVE-2020-10713
    
        A flaw in the grub.cfg parsing code was found allowing to break
        UEFI Secure Boot and load arbitrary code. Details can be found at
        https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
    
    CVE-2020-14308
    
        It was discovered that grub_malloc does not validate the allocation
        size allowing for arithmetic overflow and subsequently a heap-based
        buffer overflow.
    
    CVE-2020-14309
    
        An integer overflow in grub_squash_read_symlink may lead to a heap-
        based buffer overflow.
    
    CVE-2020-14310
    
        An integer overflow in read_section_from_string may lead to a heap-
        based buffer overflow.
    
    CVE-2020-14311
    
        An integer overflow in grub_ext2_read_link may lead to a heap-based
        buffer overflow.
    
    CVE-2020-15706
    
        script: Avoid a use-after-free when redefining a function during
        execution.
    
    CVE-2020-15707
    
        An integer overflow flaw was found in the initrd size handling.
    
    Further detailed information can be found at
    https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
    
    For the stable distribution (buster), these problems have been fixed in
    version 2.02+dfsg1-20+deb10u1.
    
    We recommend that you upgrade your grub2 packages.
    
    For the detailed security status of grub2 please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/grub2
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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