CVE编号
CVE-2021-22555利用情况
POC 已公开补丁情况
临时补丁披露时间
2021-07-07漏洞描述
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存在缓冲区错误漏洞，该漏洞源于net/netfilter/x_tables.c 中的堆越界写入。该漏洞允许攻击者通过用户名空间获得权限或引起 DoS。解决建议
1、根据影响及其安全版本排查并升级到安全版本。若您的ECS实例操作系统为Alibaba Cloud Linux 2，具体修复方案请参见《Alibaba Cloud Linux 2系统的CVE-2021-22555安全漏洞内核热补丁修复方案》2、若暂无法升级，可通过禁用非特权用户执行CLONE_NEWUSER、CLONE_NEWNET以进行缓解。
echo 0 > /proc/sys/user/max_user_namespaces
参考链接 |
|
|---|---|
| http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-O... | |
| http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice... | |
| http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice... | |
| http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bo... | |
| http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice... | |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net... | |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net... | |
| https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 | |
| https://security.netapp.com/advisory/ntap-20210805-0010/ |
受影响软件情况
| # | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
| 1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 运行在以下环境 | |||||||||
| 系统 | alibaba_cloud_linux_2.1903 | linux | * |
Up to (excluding) 1.0-20210719171132.al7 |
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| 运行在以下环境 | |||||||||
| 系统 | amazon_2 | linux | * |
Up to (excluding) 4.14.231-173.360.amzn2 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | centos_7 | linux | * |
Up to (excluding) 3.10.0-1160.41.1.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | centos_8 | linux | * |
Up to (excluding) 4_18_0-305_7_1-debuginfo-1-2.el8_4 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | debian_10 | linux | * |
Up to (excluding) 4.19.194-1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | debian_9 | linux | * |
Up to (excluding) 4.9.272-1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 2.6.19 |
Up to (excluding) 4.4.267 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 4.10 |
Up to (excluding) 4.14.231 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 4.15 |
Up to (excluding) 4.19.188 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 4.20 |
Up to (excluding) 5.4.113 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 4.5 |
Up to (excluding) 4.9.267 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 5.11 |
Up to (excluding) 5.12 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 5.5 |
Up to (excluding) 5.10.31 |
||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.2 | linux | * |
Up to (excluding) 5.3.18-lp152.84.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.3 | linux | * |
Up to (excluding) 4.12.14-197.99.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.3 | linux | * |
Up to (excluding) 5.3.18-38.14.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.3 | linux | * |
Up to (excluding) 5.3.18-59.16.1.18.8.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_6 | linux | * |
Up to (excluding) 4.1.12-124.53.5.el6uek |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_7 | linux | * |
Up to (excluding) 3.10.0-1160.41.1.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_8 | linux | * |
Up to (excluding) 4.18.0-305.12.1.el8_4 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | redhat_8 | linux | * |
Up to (excluding) 4_18_0-305_7_1-debuginfo-1-2.el8_4 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | linux | * |
Up to (excluding) 4.12.14-122.80.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | linux | * |
Up to (excluding) 4.12.14-16.65.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_14.04 | linux | * |
Up to (excluding) 4.15.0-1115.128~14.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_14.04.6_lts | linux | * |
Up to (excluding) 3.13.0-187.238 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04 | linux | * |
Up to (excluding) 4.15.0-1115.128~16.04.1 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04 | linux | * |
Up to (excluding) 5.4.0-1044.47~18.04.2 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04.5_lts | linux | * |
Up to (excluding) 4.15.0-144.148 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_20.04 | linux | * |
Up to (excluding) 5.4.0-1036.39 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_21.04 | linux | * |
Up to (excluding) 5.11.0-18.19 |
|||||
- 攻击路径 本地
- 攻击复杂度 容易
- 权限要求 普通权限
- 影响范围 全局影响
- EXP成熟度 POC 已公开
- 补丁情况 临时补丁
- 数据保密性 数据泄露
- 数据完整性 无影响
- 服务器危害 服务器失陷
- 全网数量 100000+
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