CVSS: 7.8EPSS: 0%CPEs: 26EXPL: 2CVE-2020-25669
https://notcve.org/view.php?id=CVE-2020-25669
A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free. Se encontró una vulnerabilidad en el Kernel de Linux donde la función sunkbd_reinit habiendo sido programada por la función sunkbd_interrupt antes de que sunkbd fuera liberada. Aunque el puntero colgante está establecido en NULL en la función sunkbd_disconnect, todavía se presenta un alias en sunkbd_reinit causando un Uso de la Memoria Previamente Liberada • http://www.openwall.com/lists/oss-security/2020/11/05/2 http://www.openwall.com/lists/oss-security/2020/11/20/5 https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html https://security.netapp.com/advisory/ntap-20210702-0006 https://www.openwall.com/lists/oss-security/2020/11/05/2%2C https://www.openwall.com/lists/oss- • CWE-416: Use After Free •
CVSS: 6.5EPSS: 0%CPEs: 3EXPL: 0CVE-2021-3178
https://notcve.org/view.php?id=CVE-2021-3178
fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior ** EN DISPUTA ** en el archivo fs/nfsd/nfs3xdr.c en el kernel de Linux versiones hasta 5.10.8, cuando se presenta una exportación NFS de un subdirectorio de un sistema de archivos, permite a atacantes remotos saltar otras partes del sistema de archivos por medio de READDIRPLUS. NOTA: algunas terceros argumentan que tal exportación de subdirectorios no intenta impedir este ataque; véase también el comportamiento predeterminado de no_subtree_check de exports(5) • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=51b2ee7d006a736a9126e8111d1f24e4fd0afaa6 https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SGB7TNDVQEOJ7NVTGX56UWHDNQM5TRC https://patchwork.kernel.org/project/linux-nfs/patch/20210111210129.GA11652%40fieldses.org • CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') •
CVSS: 8.1EPSS: 0%CPEs: 5EXPL: 0CVE-2020-28374 – kernel: SCSI target (LIO) write to any block on ILO backstore
https://notcve.org/view.php?id=CVE-2020-28374
In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are proxied via an attacker-selected backstore. En el archivo drivers/target/target_core_xcopy.c en el kernel de Linux versiones anteriores a 5.10.7, unos atacantes remotos pueden usar una comprobación del identificador insuficiente en el código de destino LIO SCSI para leer o escribir archivos por medio de un salto de directorio en una petición XCOPY, también se conoce como CID-2896c93811e3. Por ejemplo, un ataque puede ocurrir en una red si el atacante presenta acceso a un iSCSI LUN. • http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html http://www.openwall.com/lists/oss-security/2021/01/13/2 http://www.openwall.com/lists/oss-security/2021/01/13/5 https://bugzilla.suse.com/attachment.cgi?id=844938 https://bugzilla.suse.com/show_bug.cgi?id=1178372 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.7 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2896c93811e39d63a4d9b63ccf12a8fbc226 • CWE-20: Improper Input Validation CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') •
CVSS: 7.0EPSS: 0%CPEs: 31EXPL: 2CVE-2020-25668
https://notcve.org/view.php?id=CVE-2020-25668
A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op. Se encontró un fallo en el Kernel de Linux porque el acceso a la variable global fg_console no está correctamente sincronizado, conllevando a un uso de la memoria previamente liberada en la función con_font_op • http://www.openwall.com/lists/oss-security/2020/10/30/1 http://www.openwall.com/lists/oss-security/2020/11/04/3 https://bugzilla.redhat.com/show_bug.cgi?id=1893287%2C https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220 https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html https://security.netapp.com/advisory/ntap-20210702-0005 https:/ • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CWE-662: Improper Synchronization •
CVSS: 7.2EPSS: 0%CPEs: 11EXPL: 2CVE-2020-27777 – kernel: powerpc: RTAS calls can be used to compromise kernel integrity
https://notcve.org/view.php?id=CVE-2020-27777
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel. Se encontró un fallo en la manera en que RTAS manejaba los accesos a la memoria en el espacio de usuario para la comunicación del kernel. En un sistema invitado bloqueado (generalmente debido al arranque seguro) que se ejecuta en la parte superior de los hipervisores PowerVM o KVM (plataforma pseries), un usuario root como local podría usar este fallo para aumentar aún más sus privilegios a los de un kernel en ejecución A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel. • https://bugzilla.redhat.com/show_bug.cgi?id=1900844 https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764 https://www.openwall.com/lists/oss-security/2020/10/09/1 https://www.openwall.com/lists/oss-security/2020/11/23/2 https://access.redhat.com/security/cve/CVE-2020-27777 • CWE-862: Missing Authorization •