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CVE-2020-15707

Date: July 29, 2020

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

Language: C

Severity Score

Related Resources (20)

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
http://ubuntu.com/security/notices/USN-4432-1
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
https://security.gentoo.org/glsa/202104-05
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
https://access.redhat.com/security/vulnerabilities/grub2bootloader
https://security.netapp.com/advisory/ntap-20200731-0008/
https://nvd.nist.gov/vuln/detail/CVE-2020-15707
https://usn.ubuntu.com/4432-1/
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.suse.com/support/kb/doc/?id=000019673
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
https://www.debian.org/security/2020/dsa-4735
http://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://access.redhat.com/security/cve/CVE-2020-15707
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
https://www.mend.io/vulnerability-database/CVE-2020-15707

Severity Score

Weakness Type (CWE)

Integer Overflow or Wraparound

CWE-190

Race Conditions

CWE-362

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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