There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
Se presenta un problema con grub2 versiones anteriores a 2.06, mientras se maneja un symlink en los sistemas de archivos ext. Un sistema de archivos que contiene un enlace simbólico con un tamaño de inode de UINT32_MAX causa un desbordamiento aritmético conllevando a una asignación de memoria de tamaño cero con el posterior desbordamiento del búfer en la región heap de la memoria
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | HIGH |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
AV:L/AC:L/Au:N/C:N/I:P/A:P
| Access Vector | LOCAL |
|---|---|
| Access Complexity | LOW |
| Authentication | NONE |
| Confidentiality Impact | NONE |
| Integrity Impact | PARTIAL |
| Availability Impact | PARTIAL |
| Source | Type | Description |
|---|---|---|
| [email protected] | Secondary |
en
CWE-122
en
CWE-190
|
| [email protected] | Secondary |
en
CWE-190
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| gnu | grub2 | * | <built-in method update of dict object at 0x72a949cf3240> | Application |
| redhat | enterprise_linux | 7.0 | <built-in method update of dict object at 0x72a949cf1440> | Operating System |
| redhat | enterprise_linux | 8.0 | <built-in method update of dict object at 0x72a9cc856440> | Operating System |
| redhat | enterprise_linux_eus | 8.1 | <built-in method update of dict object at 0x72a9cc55d0c0> | Operating System |
| redhat | enterprise_linux_eus | 8.2 | <built-in method update of dict object at 0x72a949cf3840> | Operating System |
| redhat | enterprise_linux_server_aus | 8.2 | <built-in method update of dict object at 0x72a949cf08c0> | Operating System |
| redhat | enterprise_linux_server_tus | 8.2 | <built-in method update of dict object at 0x72a9af7e2000> | Operating System |
| opensuse | leap | 15.1 | <built-in method update of dict object at 0x72a949cf2ac0> | Operating System |
| opensuse | leap | 15.2 | <built-in method update of dict object at 0x72a949cf2b80> | Operating System |
| canonical | ubuntu_linux | 14.04 | <built-in method update of dict object at 0x72a949cf19c0> | Operating System |
| canonical | ubuntu_linux | 16.04 | <built-in method update of dict object at 0x72a9cc857200> | Operating System |
| canonical | ubuntu_linux | 18.04 | <built-in method update of dict object at 0x72a949cf0f40> | Operating System |
| canonical | ubuntu_linux | 20.04 | <built-in method update of dict object at 0x72a9cc856ec0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* |
| Yes | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* |
| Yes | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* |
| Yes | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* |