6.4

CVE-2020-15707

Exploit

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Gnu ≫ Grub2 Version <= 2.04
Redhat ≫ Enterprise Linux Version 7.0
Redhat ≫ Enterprise Linux Version 8.0
Microsoft ≫ Windows 10 Version -
Microsoft ≫ Windows 10 Version 1607
Microsoft ≫ Windows 10 Version 1709
Microsoft ≫ Windows 10 Version 1803
Microsoft ≫ Windows 10 Version 1809
Microsoft ≫ Windows 10 Version 1903
Microsoft ≫ Windows 10 Version 1909
Microsoft ≫ Windows 10 Version 2004
Microsoft ≫ Windows 8.1 Version -
Microsoft ≫ Windows Rt 8.1 Version -
Microsoft ≫ Windows Server 2016 Version 1903
Microsoft ≫ Windows Server 2016 Version 1909
Microsoft ≫ Windows Server 2016 Version 2004
Canonical ≫ Ubuntu Linux Version 14.04 SwEdition esm
Canonical ≫ Ubuntu Linux Version 16.04 SwEdition esm
Canonical ≫ Ubuntu Linux Version 18.04 SwEdition lts
Canonical ≫ Ubuntu Linux Version 20.04 SwEdition lts
Debian ≫ Debian Linux Version 10.0
Opensuse ≫ Leap Version 15.1
Opensuse ≫ Leap Version 15.2
Netapp ≫ Active Iq Unified Manager SwPlatform vmware_vsphere Version >= 9.5
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.59% 0.724
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6.4 0.5 5.9
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NIST 4.4 3.4 6.4
AV:L/AC:M/Au:N/C:P/I:P/A:P
Canonical 5.7 0.5 5.2
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

http://www.openwall.com/lists/oss-security/2020/07/29/3
Third Party Advisory
Mailing List
http://ubuntu.com/security/notices/USN-4432-1
Third Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader
Third Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
Vendor Advisory
Issue Tracking
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
Patch
Third Party Advisory
Vendor Advisory
https://security.gentoo.org/glsa/202104-05
Third 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/GRUB2SecureBootBypass
Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
Third Party Advisory
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
Third Party Advisory
Exploit
https://www.openwall.com/lists/oss-security/2020/07/29/3
Third Party Advisory
Mailing List
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
Third Party Advisory
https://www.suse.com/support/kb/doc/?id=000019673
Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
Third Party Advisory
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
Third Party Advisory
Mailing List
https://www.debian.org/security/2020/dsa-4735
Third Party Advisory