Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - ipmi修复卸载 ipmi_si 和 ipmi_msghandler 模块时的 UAF 您好， 当测试安装和卸载 ipmi_si.ko 和 ipmi_msghandler.ko 时系统崩溃。日志如下[ 141.087026] 缺陷无法处理 ffffffffc09b3a5a 上的内核分页请求 [ 141.087241] PGD 8fe4c0d067 P4D 8fe4c0d067 PUD 8fe4c0f067 PMD 103ad89067 PTE 0 [ 141.087464] Oops: 0010 [#1] SMP NOPTI [ 141.087580] CPU: 67 PID: 668 Comm: kworker/67:1 Kdump已加载未受感染 4.18.0.x86_64 #47 [ 141.088009] Workqueue事件 0xffffffffc09b3a40 [ 141.088009] RIP0010:0xffffffffc09b3a5a [ 141.088009] 代码错误的 RIP 值。 [141.088009] RSP: 0018:ffffb9094e2c3e88 EFLAGS: 00010246 [ 141.088009] RAX: 0000000000000000 RBX
    ffff9abfdb1f04a0 RCX 0000000000000000 [ 141.088009] RDX000000000000000 RSI0000000000000246 RDI
    0000000000000246 [ 141.088009] RBP: 0000000000000000 R08: ffff9abfffee3cb8 R09: 00000000000002e1 [141.088009] R10: ffffb9094cb73d90 R11: 00000000000f4240 R12: ffff9abfffee8700 [ 141.088009] R13:
     R140000000000000000  : ffff9abfdb1f04a0 R15: ffff9abfdb1f04a8 [ 141.088009] FS: 0000000000000000(0000) GS:ffff9abfffec0000(0000) knlGS:0000000000000000 [ 141.088009] CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033 [ 141.088009] CR2: ffffffffc09b3a30 CR3: 0000008fe4c0a001 CR4: 00000000007606e0 [141.088009] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 141.088009] DR3:
    0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 141.088009] PKRU55555554 [ 141.088009] 调用跟踪 [ 141.088009] ? process_one_work+0x195/0x390 [ 141.088009] ? worker_thread+0x30/0x390 [141.088009] process_one_work+0x390/0x390 [ 141.088009] ? kthread+0x10d/0x130 [ 141.088009] ? kthread_flush_work_fn+0x10/0x10 [ 141.088009] ? ret_from_fork+0x35/0x40] 缺陷无法处理 ffffffffc0b28a5a 上的内核分页请求 [ 200.223240] PGD 97fe00d067 P4D 200.22357997fe00d067 PUD 97fe00f067 PMD a580cbf067 PTE 0 [ 200.223464] Oops: 0010 [#1] SMP ] NOPTI: [63] PID: 664 Comm: kworker/63:1 Kdump: supported Not tainted 4.18.0.x86_64 #46 [ 200.224008] Workqueue事件 0xffffffffc0b28a40 [200.224008] RIP0010:0xffffffffc0b28a5a [ 200.224008] 代码错误的 RIP 值。 [ 200.224008] RSP
    0018ffffbf3c8e2a3e88 EFLAGS00010246 [ 200.224008] RAX: 0000000000000000 RBX: ffffa0799ad6bca0 RCX
    0000000000000000 [ 200.224008] RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000246 [200.224008] RBP: 0000000000000000 R08: ffff9fe43fde3cb8 R09: 00000000000000d5 [ 200.224008] R10:
    ffffbf3c8cb53d90 R1100000000000f4240 R12ffff9fe43fde8700 [ 200.224008] R130000000000000000 R14
     R15ffffa0799ad6bca0  : ffffa0799ad6bca8 [ 200.224008] FS: 0000000000000000(0000) GS:ffff9fe43fdc0000(0000) knlGS:0000000000000000 [ 200.224008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 200.224008] CR2:
    ffffffffc0b28a30 CR3: 00000097fe00a002 CR4: 00000000007606e0 [ 200.224008] DR0: 0000000000000000 DR1:
    0000000000000000 DR2：0000000000000000 [ 200.224008] DR3：0000000000000000 DR6：00000000fffe0ff0 DR7：
    0000000000000400 [ 200.224008] PKRU: 55555554 [ 200.224008] 调用跟踪 [ 200.224008] ? process_one_work+0x195/0x390 [ 200.224008] ? worker_thread+0x30/0x390 [ 200.224008] process_one_work+0x390/0x390 [ 200.224008] ? kthread+0x10d/0x130 [ 200.224008] ? kthread_flush_work_fn+0x10/0x10 [ 200.224008] ? ret_from_fork+0x35/0x40 [ 200.224008] 在 CPU 63 上启动内核错误 (0x1) 通知 [ 200.224008] 在 CPU 63 上完成内核错误 (0x1) 通知 [200.224008] CR2: ffffffffc0b28a5a [ 200.224008] ---[ 结束跟踪 c82a412d93f57412 ]--- 原因如下 T1rmmod ipmi_si。 ->ipmi_unregister_smi() -> ipmi_bmc_unregister() -> __ipmi_bmc_unregister() -> kref_put(&bmc->usecount, cleanup_bmc_device); -> schedule_work(&bmc->remove_work); T2rmmod ipmi_msghandl
    ---truncated--- (CVE-2021-47100)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2021-47100

medium Nessus 插件 ID 247874

版本 1.15