Medium severity · published Jul 29, 2020
CVE-2020-15706
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function…
6.4
CVSS
1%
EPSS
No
On KEV
Description
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
Windows · Microsoft
1607; 1709; 1803; 1809; 1903; 1909; +1 more · source: NVD
DL
Debian Linux · Debian
10.0 · source: NVD
EL
Enterprise Linux · Redhat
7.0; 8.0 · source: NVD
EL
Enterprise Linux Atomic Host · Redhat
All versions, or not specified · source: NVD
GR
Grub2 · Gnu
through 2.04 · source: NVD
LE
Leap · Opensuse
15.1; 15.2 · source: NVD
OC
Openshift Container Platform · Redhat
4.0 · source: NVD
SL
Suse Linux Enterprise Server · Suse
11; 12; 15 · source: NVD
UL
Ubuntu Linux · Canonical
14.04; 16.04; 18.04; 20.04; 14.04; 16.04; +2 more · source: NVD
W8
Windows 8.1 · Microsoft
All versions, or not specified · source: NVD
WR
Windows RT 8.1 · Microsoft
All versions, or not specified · source: NVD
WS
Windows Server 2012 · Microsoft
r2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15706
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-15706
Broken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
Broken Link
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
Third Party Advisory
http://ubuntu.com/security/notices/USN-4432-1
Mailing List
http://www.openwall.com/lists/oss-security/2020/07/29/3
Third Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader
Issue Tracking
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
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