High severity · published Dec 16, 2015
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…
7.4
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
23 · source: NVD
GR
Grub2 · Gnu
1.98; 1.99; 2.00; 2.01; 2.02 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2015-8370
CVE.org
https://www.cve.org/CVERecord?id=CVE-2015-8370
Exploit
http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
lists.fedoraproject.org
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
lists.fedoraproject.org
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
lists.opensuse.org
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
lists.opensuse.org
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
lists.opensuse.org
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
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