The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
La solución para XSA-423 agregó lógica al controlador netback de Linux para lidiar con una interfaz que divide un paquete de tal manera que no todos los encabezados vengan en una sola pieza. Desafortunadamente, la lógica introducida allí no tuvo en cuenta el caso extremo de que todo el paquete se divida en tantas partes como lo permita el protocolo, pero aún así sea más pequeño que el área que se trata especialmente para mantener todos los (posibles) encabezados juntos. Por lo tanto, un paquete tan inusual provocaría un Desbordamiento del Búfer en el controlador.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-787
|
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary |
en
CWE-787
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| xen | xen | * | <built-in method update of dict object at 0x7fd36960c640> | Operating System |
| debian | debian_linux | 10.0 | <built-in method update of dict object at 0x7fd36ad4f880> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd3844a2500> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd34bce0ec0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36960c0c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36960fdc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd340cc71c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36ad4c500> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36ad4c240> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36960f6c0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |