CVE-2015-8370: Integer Underflow
First published: Wed Dec 16 2015(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CentOS Grub2-pc-modules | =1.98 | |
| CentOS Grub2-pc-modules | =1.99 | |
| CentOS Grub2-pc-modules | =2.00 | |
| CentOS Grub2-pc-modules | =2.01 | |
| CentOS Grub2-pc-modules | =2.02 | |
| Red Hat Fedora | =23 |
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Reference Links
- http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
- http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
- http://www.securityfocus.com/bid/79358
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
- http://www.securitytracker.com/id/1034422
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.openwall.com/lists/oss-security/2015/12/15/6
- http://www.securityfocus.com/archive/1/537115/100/0/threaded
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
- http://seclists.org/fulldisclosure/2015/Dec/69
- https://security.gentoo.org/glsa/201512-03
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
- http://www.ubuntu.com/usn/USN-2836-1
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
- http://rhn.redhat.com/errata/RHSA-2015-2623.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
- http://www.debian.org/security/2015/dsa-3421
- http://www.openwall.com/lists/oss-security/2024/01/15/3
Frequently Asked Questions
What is the severity of CVE-2015-8370?
CVE-2015-8370 is considered a high severity vulnerability due to its potential to bypass authentication and cause denial of service.
How do I fix CVE-2015-8370?
To fix CVE-2015-8370, upgrade Grub2 to version 2.02 or later, which includes patches that address this vulnerability.
What types of attacks does CVE-2015-8370 allow?
CVE-2015-8370 may allow attackers to bypass authentication, access sensitive information, or cause disk corruption.
Which software versions are affected by CVE-2015-8370?
CVE-2015-8370 affects Grub2 versions 1.98 through 2.02, as well as Fedora version 23.
Who can exploit CVE-2015-8370?
CVE-2015-8370 can be exploited by physically proximate attackers who have access to the system.
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