CVE-2020-15707
CVE-2020-15707 — GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.
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.
Published Updated Sources: cvelistV5, canonical
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.
Exploitation
Unreported
no source claims exploitation
EPSS
2%
chance of exploitation in 30 days
CVSS base
5.7
MEDIUM
Affected scope
The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.
Vendors (1)
Products (1)
Every base score collected
Sources score independently and disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Source |
|---|---|---|---|---|---|
| 5.7 | CVSS 3.1 | MEDIUM | — | — | cvelistV5 |
Weakness & attack patterns
- CWE-362
References
17 on the record
- www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
x_refsource_CONFIRM
- wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
vendor-advisory, x_refsource_UBUNTU
- ubuntu.com/security/notices/USN-4432-1
vendor-advisory, x_refsource_UBUNTU
- www.debian.org/security/2020-GRUB-UEFI-SecureBoot
vendor-advisory, x_refsource_DEBIAN
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
x_refsource_CONFIRM
- access.redhat.com/security/vulnerabilities/grub2bootloader
vendor-advisory, x_refsource_REDHAT
- www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
vendor-advisory, x_refsource_SUSE
- www.suse.com/support/kb/doc/?id=000019673
vendor-advisory, x_refsource_SUSE
Elsewhere on this site
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.