| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-46795: ksmbd: unset the binding mark of a reused connection |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: unset the binding mark of a reused connection |
| |
| Steve French reported null pointer dereference error from sha256 lib. |
| cifs.ko can send session setup requests on reused connection. |
| If reused connection is used for binding session, conn->binding can |
| still remain true and generate_preauth_hash() will not set |
| sess->Preauth_HashValue and it will be NULL. |
| It is used as a material to create an encryption key in |
| ksmbd_gen_smb311_encryptionkey. ->Preauth_HashValue cause null pointer |
| dereference error from crypto_shash_update(). |
| |
| BUG: kernel NULL pointer dereference, address: 0000000000000000 |
| #PF: supervisor read access in kernel mode |
| #PF: error_code(0x0000) - not-present page |
| PGD 0 P4D 0 |
| Oops: 0000 [#1] PREEMPT SMP PTI |
| CPU: 8 PID: 429254 Comm: kworker/8:39 |
| Hardware name: LENOVO 20MAS08500/20MAS08500, BIOS N2CET69W (1.52 ) |
| Workqueue: ksmbd-io handle_ksmbd_work [ksmbd] |
| RIP: 0010:lib_sha256_base_do_update.isra.0+0x11e/0x1d0 [sha256_ssse3] |
| <TASK> |
| ? show_regs+0x6d/0x80 |
| ? __die+0x24/0x80 |
| ? page_fault_oops+0x99/0x1b0 |
| ? do_user_addr_fault+0x2ee/0x6b0 |
| ? exc_page_fault+0x83/0x1b0 |
| ? asm_exc_page_fault+0x27/0x30 |
| ? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3] |
| ? lib_sha256_base_do_update.isra.0+0x11e/0x1d0 [sha256_ssse3] |
| ? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3] |
| ? __pfx_sha256_transform_rorx+0x10/0x10 [sha256_ssse3] |
| _sha256_update+0x77/0xa0 [sha256_ssse3] |
| sha256_avx2_update+0x15/0x30 [sha256_ssse3] |
| crypto_shash_update+0x1e/0x40 |
| hmac_update+0x12/0x20 |
| crypto_shash_update+0x1e/0x40 |
| generate_key+0x234/0x380 [ksmbd] |
| generate_smb3encryptionkey+0x40/0x1c0 [ksmbd] |
| ksmbd_gen_smb311_encryptionkey+0x72/0xa0 [ksmbd] |
| ntlm_authenticate.isra.0+0x423/0x5d0 [ksmbd] |
| smb2_sess_setup+0x952/0xaa0 [ksmbd] |
| __process_request+0xa3/0x1d0 [ksmbd] |
| __handle_ksmbd_work+0x1c4/0x2f0 [ksmbd] |
| handle_ksmbd_work+0x2d/0xa0 [ksmbd] |
| process_one_work+0x16c/0x350 |
| worker_thread+0x306/0x440 |
| ? __pfx_worker_thread+0x10/0x10 |
| kthread+0xef/0x120 |
| ? __pfx_kthread+0x10/0x10 |
| ret_from_fork+0x44/0x70 |
| ? __pfx_kthread+0x10/0x10 |
| ret_from_fork_asm+0x1b/0x30 |
| </TASK> |
| |
| The Linux kernel CVE team has assigned CVE-2024-46795 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit f5a544e3bab78142207e0242d22442db85ba1eff and fixed in 5.15.167 with commit 9914f1bd61d5e838bb1ab15a71076d37a6db65d1 |
| Issue introduced in 5.15 with commit f5a544e3bab78142207e0242d22442db85ba1eff and fixed in 6.1.110 with commit 93d54a4b59c4b3d803d20aa645ab5ca71f3b3b02 |
| Issue introduced in 5.15 with commit f5a544e3bab78142207e0242d22442db85ba1eff and fixed in 6.6.51 with commit 41bc256da7e47b679df87c7fc7a5b393052b9cce |
| Issue introduced in 5.15 with commit f5a544e3bab78142207e0242d22442db85ba1eff and fixed in 6.10.10 with commit 4c8496f44f5bb5c06cdef5eb130ab259643392a1 |
| Issue introduced in 5.15 with commit f5a544e3bab78142207e0242d22442db85ba1eff and fixed in 6.11 with commit 78c5a6f1f630172b19af4912e755e1da93ef0ab5 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-46795 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/smb/server/smb2pdu.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/9914f1bd61d5e838bb1ab15a71076d37a6db65d1 |
| https://git.kernel.org/stable/c/93d54a4b59c4b3d803d20aa645ab5ca71f3b3b02 |
| https://git.kernel.org/stable/c/41bc256da7e47b679df87c7fc7a5b393052b9cce |
| https://git.kernel.org/stable/c/4c8496f44f5bb5c06cdef5eb130ab259643392a1 |
| https://git.kernel.org/stable/c/78c5a6f1f630172b19af4912e755e1da93ef0ab5 |
