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    CVE-2015-8370

    Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

    Published:Dec 10, 2015
    Last Modified:Apr 12, 2025
    EPS:Dec 16, 2015
    EPSS Score:0.02874
    CVSS Score:7.4

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnu
    Product
    Grub2
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.htmlhttp://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
    http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
    http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
    http://rhn.redhat.com/errata/RHSA-2015-2623.html
    http://seclists.org/fulldisclosure/2015/Dec/69
    http://www.debian.org/security/2015/dsa-3421
    http://www.openwall.com/lists/oss-security/2015/12/15/6
    http://www.openwall.com/lists/oss-security/2024/01/15/3
    http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/archive/1/537115/100/0/threaded
    http://www.securityfocus.com/bid/79358
    http://www.securitytracker.com/id/1034422
    http://www.ubuntu.com/usn/USN-2836-1
    https://security.gentoo.org/glsa/201512-03
    http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
    http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
    http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
    http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
    http://rhn.redhat.com/errata/RHSA-2015-2623.html
    http://seclists.org/fulldisclosure/2015/Dec/69
    http://www.debian.org/security/2015/dsa-3421
    http://www.openwall.com/lists/oss-security/2015/12/15/6
    http://www.openwall.com/lists/oss-security/2024/01/15/3
    http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/archive/1/537115/100/0/threaded
    http://www.securityfocus.com/bid/79358
    http://www.securitytracker.com/id/1034422
    http://www.ubuntu.com/usn/USN-2836-1
    https://security.gentoo.org/glsa/201512-03

    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