CVSS: 8.8EPSS: 0%CPEs: 3EXPL: 13CVE-2021-3493 – Linux Kernel Privilege Escalation Vulnerability
https://notcve.org/view.php?id=CVE-2021-3493
The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges. La implementación de overlayfs en el kernel de Linux no comprobó apropiadamente con respecto a los espacios de nombre de los usuarios, la configuración de las capacidades de los archivos en un sistema de archivos subyacente. Debido a la combinación de los espacios de nombre de usuarios no privilegiados junto con un parche incluido en el kernel de Ubuntu para permitir montajes de superposición no privilegiados, un atacante podría usar esto para alcanzar privilegios elevados The overlayfs stacking file system in Linux kernel does not properly validate the application of file capabilities against user namespaces, which could lead to privilege escalation. • https://github.com/briskets/CVE-2021-3493 https://github.com/inspiringz/CVE-2021-3493 https://github.com/oneoy/CVE-2021-3493 https://github.com/cerodah/overlayFS-CVE-2021-3493 https://github.com/derek-turing/CVE-2021-3493 https://github.com/puckiestyle/CVE-2021-3493 https://github.com/smallkill/CVE-2021-3493 https://github.com/Abdennour-py/CVE-2021-3493 https://github.com/fei9747/CVE-2021-3493 https://github.com/ptkhai15/OverlayFS---CVE-2021-3493 https://git • CWE-270: Privilege Context Switching Error CWE-863: Incorrect Authorization •
CVSS: 8.8EPSS: 0%CPEs: 3EXPL: 1CVE-2021-3492 – Ubuntu linux kernel shiftfs file system double free vulnerability
https://notcve.org/view.php?id=CVE-2021-3492
Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562. Shiftfs, un sistema de archivos de apilamiento fuera del árbol incluido en los kernels de Ubuntu Linux, no manejaba apropiadamente los fallos que ocurrían durante la función copy_from_user(). • https://github.com/synacktiv/CVE-2021-3492 http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 https://ubuntu.com/security/notices/USN-4917-1 https://www.openwall.com/lists/oss-security/2021/04/16/2 https:&#x • CWE-401: Missing Release of Memory after Effective Lifetime CWE-415: Double Free •
CVSS: 4.3EPSS: 0%CPEs: 3EXPL: 1CVE-2013-1055 – Potential DoS through abuse of rate limit in libunity-webapps for Firefox
https://notcve.org/view.php?id=CVE-2013-1055
The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which Firefox would then free, causing Firefox to crash. This could be achieved by adding an action to the launcher and updating it with new callbacks until the libunity-webapps rate limit was hit. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 of unity-firefox-extension and in all versions of libunity-webapps by shipping an empty unity-firefox-extension package, thus disabling the extension entirely and invalidating the attack against the libunity-webapps package. El paquete unity-firefox-extension podría ser engañado para que dejara caer una devolución de llamada C que todavía estaba en uso, que luego Firefox liberaría, causando un bloqueo en Firefox. Esto podría ser alcanzado al agregar una acción al iniciar y actualizar con nuevas devoluciones de llamada hasta que se alcance el límite de frecuencia de libunity-webapps. • https://launchpad.net/bugs/1175691 https://ubuntu.com/USN-2743-3 • CWE-404: Improper Resource Shutdown or Release •
CVSS: 6.5EPSS: 0%CPEs: 3EXPL: 1CVE-2013-1054 – Possible remote DOS in WebApps
https://notcve.org/view.php?id=CVE-2013-1054
The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefox to crash. This could be achieved by spinning the event loop inside the webapps initialization callback. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 by shipping an empty package, thus disabling the extension entirely. El paquete unity-firefox-extension podría ser engañado para destruir el contexto de las aplicaciones web de Unity, haciendo que Firefox se bloquee. Esto se puede lograr girando el bucle de eventos dentro de la devolución de llamada de inicialización de la aplicación web. • https://launchpad.net/bugs/1175661 https://ubuntu.com/USN-2743-3 • CWE-404: Improper Resource Shutdown or Release •
CVSS: 7.8EPSS: 0%CPEs: 8EXPL: 0CVE-2021-3444 – Linux kernel bpf verifier incorrect mod32 truncation
https://notcve.org/view.php?id=CVE-2021-3444
The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101. El comprobador bpf en el kernel de Linux no manejó apropiadamente el truncamiento del registro de destino mod32 cuando se sabía que el registro de origen era 0. Un atacante local con la habilidad de cargar programas bpf podría usar esta ganancia para lecturas fuera de límites en la memoria del kernel que conllevan a una divulgación de información (memoria del kernel) y, posiblemente, escrituras fuera de límites que podrían conllevar a una ejecución de código. • http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html http://www.openwall.com/lists/oss-security/2021/03/23/2 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809 https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html https://security.netapp.com/advisory/ntap-20210416-0006 https://www.openwall.com/lists&# • CWE-125: Out-of-bounds Read CWE-681: Incorrect Conversion between Numeric Types •