Vulnerability identifier: #VU32925

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15707

CWE-ID: CWE-190

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
grub
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

The vulnerability allows a local attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in the "grub_cmd_initrd" and "grub_initrd_init" functions in the "efilinux" component. An attacker with physical access can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.04

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External links
http://ubuntu.com/security/notices/USN-4432-1
http://www.openwall.com/lists/oss-security/2020/07/29/3
http://access.redhat.com/security/vulnerabilities/grub2bootloader
http://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
http://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
http://www.debian.org/security/2020/dsa-4735
http://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
http://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
http://www.openwall.com/lists/oss-security/2020/07/29/3
http://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
http://www.suse.com/support/kb/doc/?id=000019673

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.