CVE-2023-52463— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 存在安全漏洞，该漏洞源于 efivarfs 模块存在潜在的崩溃问题。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f88814cc2578c121e6edef686365036db72af0ed< 94c742324ed7e42c5bd6a9ed22e4ec6d764db4d8 |
affected |
f88814cc2578c121e6edef686365036db72af0ed< 2aa141f8bc580f8f9811dfe4e0e6009812b73826 |
affected | ||
f88814cc2578c121e6edef686365036db72af0ed< d4a9aa7db574a0da64307729cc031fb68597aa8b |
affected | ||
f88814cc2578c121e6edef686365036db72af0ed< 0049fe7e4a85849bdd778cdb72e51a791ff3d737 |
affected | ||
f88814cc2578c121e6edef686365036db72af0ed< d4a714873db0866cc471521114eeac4a5072d548 |
affected | ||
f88814cc2578c121e6edef686365036db72af0ed< 0e8d2444168dd519fea501599d150e62718ed2fe |
affected | ||
552952e51fad35670459674bcb8a03bd96fe4646 |
affected | ||
5.7.11< 5.8 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2023-52463 基础信息
漏洞信息
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Vulnerability Title
efivarfs: force RO when remounting if SetVariable is not supported
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 存在安全漏洞，该漏洞源于 efivarfs 模块存在潜在的崩溃问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2023-52463 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-52463 邮件列表归档 (1)
CVE-2023-52463 其他参考 (6)
同批安全公告 · Linux · 2024-02-23 · 共 19 条
| CVE-2024-26594 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-26598 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-26597 | 7.8 HIGH | Linux Kernel 安全漏洞 |
| CVE-2023-52461 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52454 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52453 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52459 | Linux kernel 安全漏洞 | |
| CVE-2024-26593 | Linux kernel 安全漏洞 | |
| CVE-2023-52455 | Linux kernel 安全漏洞 | |
| CVE-2023-52456 | Linux kernel 安全漏洞 | |
| CVE-2023-52458 | Linux Kernel 安全漏洞 | |
| CVE-2023-52457 | Linux kernel 安全漏洞 | |
| CVE-2023-52460 | Linux kernel 安全漏洞 | |
| CVE-2023-52462 | Linux kernel 安全漏洞 | |
| CVE-2023-52464 | Linux kernel 安全漏洞 | |
| CVE-2024-26596 | Linux kernel 安全漏洞 | |
| CVE-2024-26595 | Linux kernel 安全漏洞 | |
| CVE-2024-26599 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2023-52463
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