CVSS: 7.8EPSS: 0%CPEs: 18EXPL: 0CVE-2021-28691
https://notcve.org/view.php?id=CVE-2021-28691
Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer. Un uso de memoria previamente liberada desencadenado por el usuario en Linux xen-netback. Un frontend de red PV malicioso o con errores puede forzar a Linux netback a deshabilitar la interfaz y terminar el hilo del kernel de recepción asociado a la cola 0 en respuesta al envío de un paquete malformado por parte del frontend. Esta terminación del hilo del kernel conllevará un uso de memoria previamente liberada en Linux netback cuando es destruído el backend, ya que el hilo del kernel asociado a la cola 0 ya habrá salido y, por tanto, la llamada a la función kthread_stop se llevará a cabo contra un puntero obsoleto • https://security.gentoo.org/glsa/202107-30 https://security.netapp.com/advisory/ntap-20210805-0002 https://xenbits.xenproject.org/xsa/advisory-374.txt • CWE-416: Use After Free •
CVSS: 5.9EPSS: 0%CPEs: 18EXPL: 1CVE-2020-28097
https://notcve.org/view.php?id=CVE-2020-28097
The vgacon subsystem in the Linux kernel before 5.8.10 mishandles software scrollback. There is a vgacon_scrolldelta out-of-bounds read, aka CID-973c096f6a85. El subsistema vgacon en el kernel de Linux versiones anteriores a 5.8.10, maneja inapropiadamente el desplazamiento de software. Se presenta una lectura fuera de límites en la función vgacon_scrolldelta, también se conoce como CID-973c096f6a85 • https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.10 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=973c096f6a85e5b5f2a295126ba6928d9a6afd45 https://github.com/torvalds/linux/commit/973c096f6a85e5b5f2a295126ba6928d9a6afd45 https://seclists.org/oss-sec/2020/q3/176 https://security.netapp.com/advisory/ntap-20210805-0001 • CWE-125: Out-of-bounds Read •
CVSS: 7.0EPSS: 0%CPEs: 68EXPL: 1CVE-2021-3609 – kernel: race condition in net/can/bcm.c leads to local privilege escalation
https://notcve.org/view.php?id=CVE-2021-3609
.A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root. Se ha encontrado un fallo en el protocolo de red CAN BCM en el kernel de Linux, donde un atacante local puede abusar de un fallo en el subsistema CAN para corromper la memoria, bloquear el sistema o escalar privilegios. Esta condición de carrera en el archivo net/can/bcm.c en el kernel de Linux permite una escalada de privilegios local a root A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. • https://bugzilla.redhat.com/show_bug.cgi?id=1971651 https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md https://github.com/torvalds/linux/commit/d5f9023fa61ee8b94f37a93f08e94b136cf1e463 https://security.netapp.com/advisory/ntap-20220419-0004 https://www.openwall.com/lists/oss-security/2021/06/19/1 https://access.redhat.com/security/cve/CVE-2021-3609 • CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') •
CVSS: 6.5EPSS: 0%CPEs: 27EXPL: 0CVE-2021-3541 – libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms
https://notcve.org/view.php?id=CVE-2021-3541
A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service. Se ha encontrado un fallo en libxml2. Es posible un ataque de expansión exponencial de entidades omitiendo todos los mecanismos de protección existentes y conllevando a una denegación de servicio • https://bugzilla.redhat.com/show_bug.cgi?id=1950515 https://security.netapp.com/advisory/ntap-20210805-0007 https://www.oracle.com/security-alerts/cpujan2022.html https://access.redhat.com/security/cve/CVE-2021-3541 • CWE-400: Uncontrolled Resource Consumption CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') •
CVSS: 5.3EPSS: 0%CPEs: 35EXPL: 1CVE-2021-22897
https://notcve.org/view.php?id=CVE-2021-22897
curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly. curl versiones 7.61.0 hasta 7.76.1, sufre de exposición de un elemento de datos a una sesión equivocada debido a un error en el código para la función CURLOPT_SSL_CIPHER_LIST cuando libcurl es construído para usar la biblioteca TLS de Schannel. El ajuste de cifrado seleccionado se almacenaba en una única variable "static" en la biblioteca, lo que tiene el sorprendente efecto secundario de que si una aplicación establece múltiples transferencias concurrentes, la última que ajusta los cifrados controlará accidentalmente el ajuste usado por todas las transferencias. En el peor de los casos, esto debilita significativamente la seguridad del transporte • https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf https://curl.se/docs/CVE-2021-22897.html https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511 https://hackerone.com/reports/1172857 https://security.netapp.com/advisory/ntap-20210727-0007 https://www.oracle.com//security-alerts/cpujul2021.html https://www.oracle.com/security-alerts/cpuapr2022.html https://www.oracle.com/security-alerts/cpujan2022.html • CWE-668: Exposure of Resource to Wrong Sphere CWE-840: Business Logic Errors •