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CVE-2022-49290

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

mac80211: fix potential double free on mesh join

While commit 6a01afcf8468 ("mac80211: mesh: Free ie data when leaving mesh") fixed a memory leak on mesh leave / teardown it introduced a potential memory corruption caused by a double free when rejoining the mesh:

This double free / kernel panics can be reproduced by using wpa_supplicant with an encrypted mesh (if set up without encryption via "iw" then ifmsh->ie is always NULL, which avoids this issue). And then calling:

Note that typically these commands are not used / working when using wpa_supplicant.

Leer descripción completaMostrar menos

And it seems that wpa_supplicant or wpa_cli are going through a NETDEV_DOWN/NETDEV_UP cycle between a mesh leave and mesh join where the NETDEV_UP resets the mesh.ie to NULL via a memcpy of default_mesh_setup in cfg80211_netdev_notifier_call, which then avoids the memory corruption, too.

The issue was first observed in an application which was not using wpa_supplicant but "Senf" instead, which implements its own calls to nl80211.

Fixing the issue by removing the kfree()'ing of the mesh IE in the mesh join function and leaving it solely up to the mesh leave to free the mesh IE.

Detalles técnicos trazas, registros y código del informe original
  ieee80211_leave_mesh()
  -> kfree(sdata->u.mesh.ie);
  ...
  ieee80211_join_mesh()
  -> copy_mesh_setup()
     -> old_ie = ifmsh->ie;
     -> kfree(old_ie);

  $ iw dev mesh0 mesh leave
  $ iw dev mesh0 mesh join my-mesh

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L/PR:L) que causa double free en kernel de Linux. El atacante con permisos locales puede triggerear un panic del kernel mediante rejoin de mesh, resultando en denegación de servicio.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac80211: fix potential double free on mesh join\n\nWhile commit 6a01afcf8468 (\"mac80211: mesh: Free ie data when leaving\nmesh\") fixed a memory leak on mesh leave / teardown it introduced a\npotential memory corruption caused by a double free when rejoining the\nmesh:\n\n  ieee80211_leave_mesh()\n  -> kfree(sdata->u.mesh.ie);\n  ...\n  ieee80211_join_mesh()\n  -> copy_mesh_setup()\n     -> old_ie = ifmsh->ie;\n     -> kfree(old_ie);\n\nThis double free / kernel panics can be reproduced by using wpa_supplicant\nwith an encrypted mesh (if set up without encryption via \"iw\" then\nifmsh->ie is always NULL, which avoids this issue). And then calling:\n\n  $ iw dev mesh0 mesh leave\n  $ iw dev mesh0 mesh join my-mesh\n\nNote that typically these commands are not used / working when using\nwpa_supplicant. And it seems that wpa_supplicant or wpa_cli are going\nthrough a NETDEV_DOWN/NETDEV_UP cycle between a mesh leave and mesh join\nwhere the NETDEV_UP resets the mesh.ie to NULL via a memcpy of\ndefault_mesh_setup in cfg80211_netdev_notifier_call, which then avoids\nthe memory corruption, too.\n\nThe issue was first observed in an application which was not using\nwpa_supplicant but \"Senf\" instead, which implements its own calls to\nnl80211.\n\nFixing the issue by removing the kfree()'ing of the mesh IE in the mesh\njoin function and leaving it solely up to the mesh leave to free the\nmesh IE."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mac80211: arregla una posible doble liberación al unirse a la malla Si bien el commit 6a01afcf8468 (\"mac80211: mesh: Free ie data when leaving mesh\") corrigió una pérdida de memoria al salir/desmontar la malla, introdujo una posible corrupción de memoria causada por una doble liberación al volver a unirse a la malla: ieee80211_leave_mesh() -> kfree(sdata->u.mesh.ie); ... ieee80211_join_mesh() -> copy_mesh_setup() -> old_ie = ifmsh->ie; -> kfree(old_ie); Esta doble liberación/kernel panics se puede reproducir usando wpa_supplicant con una malla cifrada (si se configura sin cifrado a través de \"iw\", entonces ifmsh->ie siempre es NULL, lo que evita este problema). Y luego llamar a: $ iw dev mesh0 mesh leave $ iw dev mesh0 mesh join my-mesh Tenga en cuenta que normalmente estos comandos no se usan/funcionan cuando se usa wpa_supplicant. Y parece que wpa_supplicant o wpa_cli están pasando por un ciclo NETDEV_DOWN/NETDEV_UP entre un mesh leave y un mesh join donde NETDEV_UP restablece mesh.ie a NULL a través de un memcpy de default_mesh_setup en cfg80211_netdev_notifier_call, que luego también evita la corrupción de memoria. El problema se observó por primera vez en una aplicación que no usaba wpa_supplicant sino \"Senf\", que implementa sus propias llamadas a nl80211. Se solucionó el problema eliminando el kfree()'ing del IE de malla en la función de unión de malla y dejando únicamente en manos del mesh leave la liberación del IE de malla."
    }
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