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CVE-2015-8370

7.4 · HIGH

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) vi…

Published Dec 16, 2015gnuCWE-264EPSS 1.09%

Overview

CVE-2015-8370 is a high-severity vulnerability affecting gnu grub2. It was published on December 16, 2015 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from gnu. Update grub2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refhmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-December/173703.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-December/174049.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00037.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00039.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00040.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00041.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00043.htmlReflists.opensuse.org/opensuse-security-announce/2015-12/msg00044.htmlReflists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html

How CyberStrike helps

Frequently asked questions

What is CVE-2015-8370?

CVE-2015-8370 is a high-severity vulnerability affecting gnu grub2. It was published on December 16, 2015 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2015-8370?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-8370?

Check the references section for vendor advisories and patches from gnu. Update grub2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-8370?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-8370 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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