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Vulnerability Details : 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.
Publish Date : 2015-12-16 Last Update Date : 2018-10-09
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- CVSS Scores & Vulnerability Types

CVSS Score
6.9
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceMemory corruptionBypass a restriction or similarObtain Information
CWE ID 264

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2015:2623: grub2 security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20152623 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2015-8370

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 23 Version Details Vulnerabilities
2 Application GNU Grub2 1.98 Version Details Vulnerabilities
3 Application GNU Grub2 1.99 Version Details Vulnerabilities
4 Application GNU Grub2 2.00 Version Details Vulnerabilities
5 Application GNU Grub2 2.01 Version Details Vulnerabilities
6 Application GNU Grub2 2.02 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 1
GNU Grub2 5

- References For CVE-2015-8370

http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
FEDORA FEDORA-2015-cebe5133e7
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
FEDORA FEDORA-2015-90c27b6e91
http://www.securityfocus.com/bid/79358
BID 79358 GNU GRUB2 CVE-2015-8370 Multiple Local Authentication Bypass Vulnerabilities Release Date:2016-01-15
https://security.gentoo.org/glsa/201512-03
GENTOO GLSA-201512-03
http://www.ubuntu.com/usn/USN-2836-1
UBUNTU USN-2836-1
http://www.securitytracker.com/id/1034422
SECTRACK 1034422
http://www.securityfocus.com/archive/1/537115/100/0/threaded
BUGTRAQ 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
SUSE SUSE-SU-2015:2385
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
SUSE SUSE-SU-2015:2386
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
SUSE SUSE-SU-2015:2387
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
SUSE openSUSE-SU-2015:2392
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
SUSE SUSE-SU-2015:2399
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
SUSE openSUSE-SU-2016:0036
http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
http://rhn.redhat.com/errata/RHSA-2015-2623.html
REDHAT RHSA-2015:2623
http://seclists.org/fulldisclosure/2015/Dec/69
FULLDISC 20151216 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]
http://www.debian.org/security/2015/dsa-3421
DEBIAN DSA-3421
http://www.openwall.com/lists/oss-security/2015/12/15/6
MLIST [oss-security] 20151215 Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370]
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html CONFIRM
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html CONFIRM
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
SUSE openSUSE-SU-2015:2375

- Metasploit Modules Related To CVE-2015-8370

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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