CVE-2023-52463

一、漏洞信息
 漏洞编号：[CVE-2023-52463](https://nvd.nist.gov/vuln/detail/CVE-2023-52463)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:efivarfs: force RO when remounting if SetVariable is not supportedIf SetVariable at runtime is not supported by the firmware we never assigna callback for that function. At the same time mount the efivarfs asRO so no one can call that.  However, we never check the permission flagswhen someone remounts the filesystem as RW. As a result this leads to acrash 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 whichwe can use to check the requested flags and deny anything that s not ROif the firmware doesn t implement SetVariable at runtime.
 漏洞公开时间：2024-02-23 23:15:08
 漏洞创建时间：2024-02-23 15:32:20
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2023-52463
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-52463 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2023-52463 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 | https://bugzilla.suse.com/show_bug.cgi?id=1220328 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:5102 | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:5101 | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:5673 | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:5672 | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:6567 | https://bugzilla.redhat.com/show_bug.cgi?id=2265797 |
| ubuntu | https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://ubuntu.com/security/notices/USN-6688-1 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://ubuntu.com/security/notices/USN-6725-1 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2023-52463 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://ubuntu.com/security/notices/USN-6725-2 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2023-52463 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2023-52463 | https://ubuntu.com/security/CVE-2023-52463 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2023-52463 | https://ubuntu.com/security/CVE-2023-52463 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2023-52463 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2023-52463 |
| cve_search |  | https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 |
| cve_search |  | https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826 |
| cve_search |  | https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b |
| cve_search |  | https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737 |
| cve_search |  | https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548 |
| cve_search |  | https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe |
| snyk | https://github.com/torvalds/linux/commit/0e8d2444168dd519fea501599d150e62718ed2fe | https://security.snyk.io/vuln/SNYK-UNMANAGED-TORVALDSLINUX-6282366 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  其它
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://github.com/torvalds/linux/commit/0e8d2444168dd519fea501599d150e62718ed2fe |  | snyk |
|  |  | https://git.kernel.org/stable/c/0049fe7e4a85849bdd778cdb72e51a791ff3d737 |  | nvd |
|  |  | https://git.kernel.org/stable/c/0e8d2444168dd519fea501599d150e62718ed2fe |  | nvd |
|  |  | https://git.kernel.org/stable/c/2aa141f8bc580f8f9811dfe4e0e6009812b73826 |  | nvd |
|  |  | https://git.kernel.org/stable/c/94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 |  | nvd |
|  |  | https://git.kernel.org/stable/c/d4a714873db0866cc471521114eeac4a5072d548 |  | nvd |
|  |  | https://git.kernel.org/stable/c/d4a9aa7db574a0da64307729cc031fb68597aa8b |  | nvd |
| linux_kernel | 5.10.209 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f88814cc2578c121e6edef686365036db72af0ed | linuxkernelcves |
| linux_kernel | 5.15.148 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=2aa141f8bc580f8f9811dfe4e0e6009812b73826 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f88814cc2578c121e6edef686365036db72af0ed | linuxkernelcves |
| linux_kernel | 6.1.75 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=d4a9aa7db574a0da64307729cc031fb68597aa8b | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f88814cc2578c121e6edef686365036db72af0ed | linuxkernelcves |
| linux_kernel | 6.6.14 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0049fe7e4a85849bdd778cdb72e51a791ff3d737 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f88814cc2578c121e6edef686365036db72af0ed | linuxkernelcves |
| linux_kernel | 6.7.2 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=d4a714873db0866cc471521114eeac4a5072d548 | https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f88814cc2578c121e6edef686365036db72af0ed | linuxkernelcves |
| linux |  | https://git.kernel.org/linus/0e8d2444168dd519fea501599d150e62718ed2fe | https://git.kernel.org/linus/f88814cc2578c121e6edef686365036db72af0ed | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:efivarfs: force RO when remounting if SetVariable is not supportedIf SetVariable at runtime is not supported by the firmware we never assigna callback for that function. At the same time mount the efivarfs asRO so no one can call that.  However, we never check the permission flagswhen someone remounts the filesystem as RW. As a result this leads to acrash 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 whichwe can use to check the requested flags and deny anything that s not ROif the firmware doesn t implement SetVariable at runtime.
 openEuler评分：
  5.5
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-22.03-LTS-SP3(5.10.0):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP4(5.10.0):不受影响
4.master:不受影响
5.openEuler-24.03-LTS(6.6.0):不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master:否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否
8.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-22.03-LTS-SP3(5.10.0):不修复-超出修复范围
2.master:不受影响-漏洞代码不能被攻击者触发
3.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-20.03-LTS-SP4(4.19.90):不受影响-漏洞代码不存在
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不存在
6.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

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