CVE-2015-8370

Public Exploit

Description

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.

Categories

7.4
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.92% Top 15%
Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory fedoraproject.org Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory debian.org
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2015-8370?
CVE-2015-8370 has been scored as a high severity vulnerability.
How to fix CVE-2015-8370?
To fix CVE-2015-8370, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-8370 being actively exploited in the wild?
It is possible that CVE-2015-8370 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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