Multiple vulnerabilities in Grub2
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-4692 CVE-2023-4693 |
| CWE-ID | CWE-787 CWE-125 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
grub Universal components / Libraries / Libraries used by multiple products |
| Vendor | GNU |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds write
EUVDB-ID: #VU81627
Risk: Low
CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-4692
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a local user to bypass secure boot protection.
The vulnerability exists due to a boundary error in NTFS driver implementation in grub-core/fs/ntfs.c when parsing the $ATTRIBUTE_LIST attribute for the $MFT file. A local user can pass a specially crafted image to the application, trigger an out-of-bounds write and bypass secure boot protection.
MitigationInstall updates from vendor's website.
Vulnerable software versionsgrub: 1.99 - 2.06
External linkshttp://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Out-of-bounds read
EUVDB-ID: #VU81628
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-4693
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows an attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition within the NTFS driver in grub-core/fs/ntfs.c when reading data from the resident $DATA attribute. A attacker with physical access to the system use a specially crafted NTFS file system image to read arbitrary memory locations, such as data cached in memory or EFI variables values.
Install updates from vendor's website.
Vulnerable software versionsgrub: 1.99 - 2.06
External linkshttp://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
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.
