CVSS: 5.1EPSS: 0%CPEs: 5EXPL: 0CVE-2020-16120 – Unprivileged overlay + shiftfs read access
https://notcve.org/view.php?id=CVE-2020-16120
Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef ("ovl: stack file ops"). This was fixed in kernel version 5.8 by commits 56230d9 ("ovl: verify permissions in ovl_path_open()"), 48bd024 ("ovl: switch to mounter creds in readdir") and 05acefb ("ovl: check permission to open real file"). Additionally, commits 130fdbc ("ovl: pass correct flags for opening real directory") and 292f902 ("ovl: call secutiry hook in ovl_real_ioctl()") in kernel 5.8 might also be desired or necessary. • https://git.kernel.org/linus/05acefb4872dae89e772729efb194af754c877e8 https://git.kernel.org/linus/48bd024b8a40d73ad6b086de2615738da0c7004f https://git.kernel.org/linus/56230d956739b9cb1cbde439d76227d77979a04d https://git.kernel.org/linus/b6650dab404c701d7fe08a108b746542a934da84 https://git.kernel.org/linus/d1d04ef8572bc8c22265057bd3d5a79f223f8f52 https://launchpad.net/bugs/1894980 https://launchpad.net/bugs/1900141 https://ubuntu.com/USN-4576-1 https://ubuntu.com/USN-4577-1 https://ubuntu.com/USN-4578-1 https://www.openwall • CWE-266: Incorrect Privilege Assignment •
CVSS: 7.5EPSS: 1%CPEs: 20EXPL: 1CVE-2020-25645 – kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints
https://notcve.org/view.php?id=CVE-2020-25645
A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality. Se encontró un fallo en el kernel de Linux en versiones anteriores a 5.9-rc7. El tráfico entre dos endpoints Geneve puede no estar cifrado cuando IPsec está configurado para cifrar el tráfico para el puerto UDP específico usado por el túnel GENEVE, permitiendo a cualquier persona entre los dos endpoints leer el tráfico sin cifrar. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html https://bugzilla.redhat.com/show_bug.cgi?id=1883988 https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html https://security.netapp.com/advisory/ntap-20201103-0004 https://ww • CWE-319: Cleartext Transmission of Sensitive Information •
CVSS: 5.5EPSS: 0%CPEs: 15EXPL: 0CVE-2020-25641 – kernel: soft-lockups in iov_iter_copy_from_user_atomic() could result in DoS
https://notcve.org/view.php?id=CVE-2020-25641
A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability. Se encontró un fallo en la implementación de biovecs del kernel de Linux en versiones anteriores a 5.9-rc7. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html http://www.openwall.com/lists/oss-security/2020/10/06/9 https://bugzilla.redhat.com/show_bug.cgi?id=1881424 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e24969022cbd61ddc586f14824fc205661bb124 https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html https://lists.debian.org/debian-lts-announce/2020/ • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •
CVSS: 6.9EPSS: 0%CPEs: 1EXPL: 1CVE-2020-26541 – kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
https://notcve.org/view.php?id=CVE-2020-26541
The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c. El kernel de Linux versiones hasta 5.8.13, no aplica apropiadamente el mecanismo de protección Secure Boot Forbidden Signature Database (también se conoce como dbx). Esto afecta a los archivos certs/blacklist.c y certs/system_keyring.c A flaw was found in the Linux kernel in certs/blacklist.c, When signature entries for EFI_CERT_X509_GUID are contained in the Secure Boot Forbidden Signature Database, the entries are skipped. This can cause a security threat and breach system integrity, confidentiality and even lead to a denial of service problem. • https://lkml.org/lkml/2020/9/15/1871 https://access.redhat.com/security/cve/CVE-2020-26541 https://bugzilla.redhat.com/show_bug.cgi?id=1886285 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •
CVSS: 5.5EPSS: 0%CPEs: 7EXPL: 0CVE-2020-26088
https://notcve.org/view.php?id=CVE-2020-26088
A missing CAP_NET_RAW check in NFC socket creation in net/nfc/rawsock.c in the Linux kernel before 5.8.2 could be used by local attackers to create raw sockets, bypassing security mechanisms, aka CID-26896f01467a. Una falta de comprobación de CAP_NET_RAW en la creación de sockets NFC en el archivo net/nfc/rawsock.c en el Kernel de Linux versiones anteriores a 5.8.2, podría ser usada por unos atacantes locales para crear sockets sin procesar, omitiendo los mecanismos de seguridad, también se conoce como CID-26896f01467a. • http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00001.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2 https://github.com/torvalds/linux/commit/26896f01467a28651f7a536143fe5ac8449d4041 https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html https: • CWE-276: Incorrect Default Permissions •