fkie_cve-2024-42318
Vulnerability from fkie_nvd
Published
2024-08-17 09:15
Modified
2025-11-03 22:18
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: landlock: Don't lose track of restrictions on cred_transfer When a process' cred struct is replaced, this _almost_ always invokes the cred_prepare LSM hook; but in one special case (when KEYCTL_SESSION_TO_PARENT updates the parent's credentials), the cred_transfer LSM hook is used instead. Landlock only implements the cred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes all information on Landlock restrictions to be lost. This basically means that a process with the ability to use the fork() and keyctl() syscalls can get rid of all Landlock restrictions on itself. Fix it by adding a cred_transfer hook that does the same thing as the existing cred_prepare hook. (Implemented by having hook_cred_prepare() call hook_cred_transfer() so that the two functions are less likely to accidentally diverge in the future.)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://bugs.chromium.org/p/project-zero/issues/detail?id=2566Issue Tracking, Third Party Advisory
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ffPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://www.openwall.com/lists/oss-security/2024/08/17/2Mailing List
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/08/17/2Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Don\u0027t lose track of restrictions on cred_transfer\n\nWhen a process\u0027 cred struct is replaced, this _almost_ always invokes\nthe cred_prepare LSM hook; but in one special case (when\nKEYCTL_SESSION_TO_PARENT updates the parent\u0027s credentials), the\ncred_transfer LSM hook is used instead.  Landlock only implements the\ncred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes\nall information on Landlock restrictions to be lost.\n\nThis basically means that a process with the ability to use the fork()\nand keyctl() syscalls can get rid of all Landlock restrictions on\nitself.\n\nFix it by adding a cred_transfer hook that does the same thing as the\nexisting cred_prepare hook. (Implemented by having hook_cred_prepare()\ncall hook_cred_transfer() so that the two functions are less likely to\naccidentally diverge in the future.)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: landlock: no pierda de vista las restricciones en cred_transfer Cuando se reemplaza la estructura cred de un proceso, esto _almost_ always invoca el gancho LSM cred_prepare; pero en un caso especial (cuando KEYCTL_SESSION_TO_PARENT actualiza las credenciales de los padres), se utiliza el gancho LSM cred_transfer. Landlock solo implementa el gancho cred_prepare, no cred_transfer, por lo que KEYCTL_SESSION_TO_PARENT hace que se pierda toda la informaci\u00f3n sobre las restricciones de Landlock. B\u00e1sicamente, esto significa que un proceso con la capacidad de utilizar las llamadas al sistema fork() y keyctl() puede deshacerse de todas las restricciones de Landlock sobre s\u00ed mismo. Solucionelo agregando un gancho cred_transfer que haga lo mismo que el gancho cred_prepare existente. (Se implementa haciendo que hook_cred_prepare() llame a hook_cred_transfer() para que sea menos probable que las dos funciones diverjan accidentalmente en el futuro)."
    }
  ],
  "id": "CVE-2024-42318",
  "lastModified": "2025-11-03T22:18:03.530",
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          "attackComplexity": "LOW",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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}


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