cve-2024-53186
Vulnerability from cvelistv5
Published
2024-12-27 13:49
Modified
2025-02-10 17:21
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in SMB request handling A race condition exists between SMB request handling in `ksmbd_conn_handler_loop()` and the freeing of `ksmbd_conn` in the workqueue handler `handle_ksmbd_work()`. This leads to a UAF. - KASAN: slab-use-after-free Read in handle_ksmbd_work - KASAN: slab-use-after-free in rtlock_slowlock_locked This race condition arises as follows: - `ksmbd_conn_handler_loop()` waits for `conn->r_count` to reach zero: `wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);` - Meanwhile, `handle_ksmbd_work()` decrements `conn->r_count` using `atomic_dec_return(&conn->r_count)`, and if it reaches zero, calls `ksmbd_conn_free()`, which frees `conn`. - However, after `handle_ksmbd_work()` decrements `conn->r_count`, it may still access `conn->r_count_q` in the following line: `waitqueue_active(&conn->r_count_q)` or `wake_up(&conn->r_count_q)` This results in a UAF, as `conn` has already been freed. The discovery of this UAF can be referenced in the following PR for syzkaller's support for SMB requests.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96261adb998a3b513468b6ce17dbec76be5507d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a8c5d89d327ff58e9b2517f8a6afb4181d32c6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a96f9eb7add30ba0fafcfe7b7aca090978196800Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f20b77f7897e6aab9ce5527e6016ad2be5d70a33Patch
Impacted products
Vendor Product Version
Linux Linux Version: 18f06bacc197d4ac9b518ad1c69999bc3d83e7aa
Version: e9dac92f4482a382e8c0fe1bc243da5fc3526b0c
Version: ee426bfb9d09b29987369b897fe9b6485ac2be27
Version: ee426bfb9d09b29987369b897fe9b6485ac2be27
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   Linux Linux Version: 6.12
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This leads to a UAF.\\n- KASAN: slab-use-after-free Read in handle_ksmbd_work\\n- KASAN: slab-use-after-free in rtlock_slowlock_locked\\n\\nThis race condition arises as follows:\\n- `ksmbd_conn_handler_loop()` waits for `conn-\u003er_count` to reach zero:\\n  `wait_event(conn-\u003er_count_q, atomic_read(\u0026conn-\u003er_count) == 0);`\\n- Meanwhile, `handle_ksmbd_work()` decrements `conn-\u003er_count` using\\n  `atomic_dec_return(\u0026conn-\u003er_count)`, and if it reaches zero, calls\\n  `ksmbd_conn_free()`, which frees `conn`.\\n- However, after `handle_ksmbd_work()` decrements `conn-\u003er_count`,\\n  it may still access `conn-\u003er_count_q` in the following line:\\n  `waitqueue_active(\u0026conn-\u003er_count_q)` or `wake_up(\u0026conn-\u003er_count_q)`\\n  This results in a UAF, as `conn` has already been freed.\\n\\nThe discovery of this UAF can be referenced in the following PR for\\nsyzkaller\u0027s support for SMB requests.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige el problema de use-after-free en la gesti\u00f3n de solicitudes SMB Existe una condici\u00f3n de ejecuci\u00f3n entre la gesti\u00f3n de solicitudes SMB en `ksmbd_conn_handler_loop()` y la liberaci\u00f3n de `ksmbd_conn` en el controlador de cola de trabajo `handle_ksmbd_work()`. Esto conduce a una UAF. - KASAN: slab-use-after-free Leer en handle_ksmbd_work - KASAN: slab-use-after-free en rtlock_slowlock_locked Esta condici\u00f3n de ejecuci\u00f3n surge de la siguiente manera: - `ksmbd_conn_handler_loop()` espera a que `conn-\u0026gt;r_count` llegue a cero: `wait_event(conn-\u0026gt;r_count_q, atomic_read(\u0026amp;conn-\u0026gt;r_count) == 0);` - Mientras tanto, `handle_ksmbd_work()` decrementa `conn-\u0026gt;r_count` usando `atomic_dec_return(\u0026amp;conn-\u0026gt;r_count)`, y si llega a cero, llama a `ksmbd_conn_free()`, que libera a `conn`. - Sin embargo, despu\u00e9s de que `handle_ksmbd_work()` disminuya `conn-\u0026gt;r_count`, a\u00fan puede acceder a `conn-\u0026gt;r_count_q` en la siguiente l\u00ednea: `waitqueue_active(\u0026amp;conn-\u0026gt;r_count_q)` o `wake_up(\u0026amp;conn-\u0026gt;r_count_q)` Esto da como resultado un UAF, ya que `conn` ya se ha liberado. Se puede hacer referencia al descubrimiento de este UAF en la siguiente PR para el soporte de syzkaller para solicitudes SMB.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"},{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.55\",\"versionEndExcluding\":\"6.6.64\",\"matchCriteriaId\":\"C813C628-8D83-4585-9CCE-3DE13EBB4454\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.10.14\",\"versionEndExcluding\":\"6.11\",\"matchCriteriaId\":\"41AB04F0-1096-4B39-8148-796AB65AA193\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11.3\",\"versionEndExcluding\":\"6.11.11\",\"matchCriteriaId\":\"C2F1D9BC-CB2F-488F-90F8-8456CD3C44CB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.2\",\"matchCriteriaId\":\"D8882B1B-2ABC-4838-AC1D-DBDBB5764776\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/96261adb998a3b513468b6ce17dbec76be5507d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a96f9eb7add30ba0fafcfe7b7aca090978196800\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f20b77f7897e6aab9ce5527e6016ad2be5d70a33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
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}


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