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CVE-2023-52463

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: efivarfs: force RO when remounting if SetVariable is not supported If SetVariable at runtime is not supported by the firmware we never assign a callback for that function. At the same time mount the efivarfs as RO so no one can call that. However, we never check the permission flags when someone remounts the filesystem as RW. As a result this leads to a crash looking like this: $ mount -o remount,rw /sys/firmware/efi/efivars $ efi-updatevar -f PK.auth PK [ 303.279166] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 303.280482] Mem abort info: [ 303.280854] ESR = 0x0000000086000004 [ 303.281338] EC = 0x21: IABT (current EL), IL = 32 bits [ 303.282016] SET = 0, FnV = 0 [ 303.282414] EA = 0, S1PTW = 0 [ 303.282821] FSC = 0x04: level 0 translation fault [ 303.283771] user pgtable: 4k pages, 48-bit VAs, pgdp=000000004258c000 [ 303.284913] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [ 303.286076] Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP [ 303.286936] Modules linked in: qrtr tpm_tis tpm_tis_core crct10dif_ce arm_smccc_trng rng_core drm fuse ip_tables x_tables ipv6 [ 303.288586] CPU: 1 PID: 755 Comm: efi-updatevar Not tainted 6.3.0-rc1-00108-gc7d0c4695c68 #1 [ 303.289748] Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2023.04-00627-g88336918701d 04/01/2023 [ 303.291150] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 303.292123] pc : 0x0 [ 303.292443] lr : efivar_set_variable_locked+0x74/0xec [ 303.293156] sp : ffff800008673c10 [ 303.293619] x29: ffff800008673c10 x28: ffff0000037e8000 x27: 0000000000000000 [ 303.294592] x26: 0000000000000800 x25: ffff000002467400 x24: 0000000000000027 [ 303.295572] x23: ffffd49ea9832000 x22: ffff0000020c9800 x21: ffff000002467000 [ 303.296566] x20: 0000000000000001 x19: 00000000000007fc x18: 0000000000000000 [ 303.297531] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaaac807ab54 [ 303.298495] x14: ed37489f673633c0 x13: 71c45c606de13f80 x12: 47464259e219acf4 [ 303.299453] x11: ffff000002af7b01 x10: 0000000000000003 x9 : 0000000000000002 [ 303.300431] x8 : 0000000000000010 x7 : ffffd49ea8973230 x6 : 0000000000a85201 [ 303.301412] x5 : 0000000000000000 x4 : ffff0000020c9800 x3 : 00000000000007fc [ 303.302370] x2 : 0000000000000027 x1 : ffff000002467400 x0 : ffff000002467000 [ 303.303341] Call trace: [ 303.303679] 0x0 [ 303.303938] efivar_entry_set_get_size+0x98/0x16c [ 303.304585] efivarfs_file_write+0xd0/0x1a4 [ 303.305148] vfs_write+0xc4/0x2e4 [ 303.305601] ksys_write+0x70/0x104 [ 303.306073] __arm64_sys_write+0x1c/0x28 [ 303.306622] invoke_syscall+0x48/0x114 [ 303.307156] el0_svc_common.constprop.0+0x44/0xec [ 303.307803] do_el0_svc+0x38/0x98 [ 303.308268] el0_svc+0x2c/0x84 [ 303.308702] el0t_64_sync_handler+0xf4/0x120 [ 303.309293] el0t_64_sync+0x190/0x194 [ 303.309794] Code: ???????? ???????? ???????? ???????? (????????) [ 303.310612] ---[ end trace 0000000000000000 ]--- Fix this by adding a .reconfigure() function to the fs operations which we can use to check the requested flags and deny anything that's not RO if the firmware doesn't implement SetVariable at runtime.

Related Files

Red Hat Security Advisory 2024-5673-03
Posted Aug 27, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-5673-03 - An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Extended Update Support. Issues addressed include denial of service, memory leak, and out of bounds access vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability, memory leak
systems | linux, redhat
advisories | CVE-2023-52463
SHA-256 | f33f150a0a1961707743ee8d5f1a2f0324454d6a0ab78b9e4226b799439c2499
Red Hat Security Advisory 2024-5672-03
Posted Aug 27, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-5672-03 - An update for kernel is now available for Red Hat Enterprise Linux 9.2 Extended Update Support. Issues addressed include denial of service, memory leak, and out of bounds access vulnerabilities.

tags | advisory, denial of service, kernel, vulnerability, memory leak
systems | linux, redhat
advisories | CVE-2023-52463
SHA-256 | 155d013602195dd58f7ed6d7c7f6f9df864b8e65f73497d7e62c80464c220589
Ubuntu Security Notice USN-6819-4
Posted Jun 26, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-4 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 55aee9f86f0d217c785cca08ee7c9f4bcee8a48724cb7c733501904578ab9082
Ubuntu Security Notice USN-6819-3
Posted Jun 13, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-3 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 0776ecd3ecb1bfa0399486a67208c24d784625998b8a8fcde961179d780df009
Ubuntu Security Notice USN-6819-2
Posted Jun 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-2 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | aa4906916aa0bf9376da682c5ed9fb70434203cee9f1f143722bf1febd67513c
Ubuntu Security Notice USN-6819-1
Posted Jun 10, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6819-1 - Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel did not properly validate H2C PDU data, leading to a null pointer dereference vulnerability. A remote attacker could use this to cause a denial of service. Chenyuan Yang discovered that the RDS Protocol implementation in the Linux kernel contained an out-of-bounds read vulnerability. An attacker could use this to possibly cause a denial of service.

tags | advisory, remote, denial of service, kernel, tcp, protocol
systems | linux, ubuntu
advisories | CVE-2023-52443, CVE-2023-52444, CVE-2023-52447, CVE-2023-52451, CVE-2023-52452, CVE-2023-52453, CVE-2023-52455, CVE-2023-52457, CVE-2023-52462, CVE-2023-52463, CVE-2023-52465, CVE-2023-52467, CVE-2023-52469, CVE-2023-52472
SHA-256 | 6b5f365e0a9b1cc8353c9a51d4e012a3c1a46a05a4cee68676de2559d30b4103
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