Integer overflow in GNU Grub2
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (65.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- GNU Grub2 — versions 1.98, 1.99, 2.00
- Fedoraproject Fedora — versions 23
Weakness classification (CWE)
Public proof-of-concept exploits
References
- packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
- lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html (vendor-advisory)
- hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html (Exploit)
- www.securityfocus.com/bid/79358 (vdb-entry)
- lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html (vendor-advisory)
- www.securitytracker.com/id/1034422 (vdb-entry)
- www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html (Patch)
- lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html (vendor-advisory)
Frequently asked questions
- What is CVE-2015-8370?
- CVE-2015-8370 is a high-severity vulnerability in GNU Grub2, classified under CWE-264. CVSS score: 7.4/10. Published 2015-12-16.
- How severe is CVE-2015-8370?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2015-8370 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.