VulnerabilityModified
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 is already executing, leading to arbitrary code execution and secure boot…
MEDIUM 6.4EPSS 0.98%
Does this matter?
Lower severity and a low EPSS score (0.98%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.4 MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.98% probability · 60th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362, CWE-416
- Affected
- gnu/grub2 · redhat/enterprise linux atomic host · redhat/openshift container platform · canonical/ubuntu linux · debian/debian linux · redhat/enterprise linux · suse/suse linux enterprise server · microsoft/windows 10 · microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · opensuse/leap
- Source
- security@ubuntu.com
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlBroken Link, Mailing List, Third Party Advisory
- http://ubuntu.com/security/notices/USN-4432-1Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/grub2bootloaderThird Party Advisory
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlIssue Tracking, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011Patch, Third Party Advisory, Vendor Advisory
- https://security.gentoo.org/glsa/202104-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200731-0008/Third Party Advisory
- https://usn.ubuntu.com/4432-1/Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassThird Party Advisory
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBootThird Party Advisory
- https://www.debian.org/security/2020/dsa-4735Third Party Advisory
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
- https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/Third Party Advisory
- https://www.suse.com/support/kb/doc/?id=000019673Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlBroken Link, Mailing List, Third Party Advisory
- http://ubuntu.com/security/notices/USN-4432-1Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/grub2bootloaderThird Party Advisory
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlIssue Tracking, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011Patch, Third Party Advisory, Vendor Advisory
- https://security.gentoo.org/glsa/202104-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200731-0008/Third Party Advisory
- https://usn.ubuntu.com/4432-1/Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassThird Party Advisory
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBootThird Party Advisory
- https://www.debian.org/security/2020/dsa-4735Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.