CVE-2015-8370
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 2.02~beta2-33 |
| debian | bullseye | fixed | 2.02~beta2-33 |
| debian | forky | fixed | 2.02~beta2-33 |
| debian | sid | fixed | 2.02~beta2-33 |
| debian | trixie | fixed | 2.02~beta2-33 |
| fedora | 23 | affected | |
References
- https://www.suse.com/security/cve/CVE-2015-8370.html
- 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
- https://security-tracker.debian.org/tracker/CVE-2015-8370
CWEs
CWE-264 CWE-191
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.