CVE编号
CVE-2018-14634利用情况
漏洞武器化补丁情况
官方补丁披露时间
2018-09-26漏洞描述
Linux内核的create_elf_tables函数中存在一个整数溢出缺陷，能访问SUID可执行文件的低权限的本地用户可通过利用此缺陷进行权限提升。内核2.6.x/3.10.x/4.14.x 受影响。 由于利用该漏洞需要大量内存空间，32位的操作系统不受此漏洞影响。小于32GB内存的操作系统几乎不会受到此漏洞影响。 RHEL 5 附带的内核不受此漏洞影响。 缓解措施： -- RHEL系操作系统 1) 将以下代码存为mitigation.stp function clamp_stack_rlim_cur:long () %{ struct rlimit *rlim = current->signal->rlim; unsigned long rlim_cur = READ_ONCE(rlim[RLIMIT_STACK].rlim_cur); unsigned long limit = _STK_LIM / 4 * 3; limit *= 4; // multiply it back up, to the scale used by rlim_cur if (rlim_cur > limit) { WRITE_ONCE(rlim[RLIMIT_STACK].rlim_cur, limit); STAP_RETURN(limit); } else STAP_RETURN(0); %} probe kernel.function("copy_strings").call { l = clamp_stack_rlim_cur() if (l) printf("lowered process %s(%d) STACK rlim_cur to %p\n", execname(), pid(), l) } probe begin { printf("CVE-2018-14634 mitigation loaded\n") } probe end { printf("CVE-2018-14634 mitigation unloaded\n") } 2) 安装systemtap, 使用systemtap运行上述文件 sudo stap -g mitigation.stp解决建议
缓解措施：-- RHEL系操作系统
1) 将以下代码存为mitigation.stp
function clamp_stack_rlim_cur:long ()
%{
struct rlimit *rlim = current->signal->rlim;
unsigned long rlim_cur = READ_ONCE(rlim[RLIMIT_STACK].rlim_cur);
unsigned long limit = _STK_LIM / 4 * 3;
limit *= 4; // multiply it back up, to the scale used by rlim_cur
if (rlim_cur > limit) {
WRITE_ONCE(rlim[RLIMIT_STACK].rlim_cur, limit);
STAP_RETURN(limit);
} else
STAP_RETURN(0);
%}
probe kernel.function("copy_strings").call
{
l = clamp_stack_rlim_cur()
if (l)
printf("lowered process %s(%d) STACK rlim_cur to %p\n",
execname(), pid(), l)
}
probe begin {
printf("CVE-2018-14634 mitigation loaded\n")
}
probe end {
printf("CVE-2018-14634 mitigation unloaded\n")
}
2) 安装systemtap, 使用systemtap运行上述文件
sudo stap -g mitigation.stp
参考链接 |
|
|---|---|
| http://www.openwall.com/lists/oss-security/2021/07/20/2 | |
| http://www.securityfocus.com/bid/105407 | |
| https://access.redhat.com/errata/RHSA-2018:2748 | |
| https://access.redhat.com/errata/RHSA-2018:2763 | |
| https://access.redhat.com/errata/RHSA-2018:2846 | |
| https://access.redhat.com/errata/RHSA-2018:2924 | |
| https://access.redhat.com/errata/RHSA-2018:2925 | |
| https://access.redhat.com/errata/RHSA-2018:2933 | |
| https://access.redhat.com/errata/RHSA-2018:3540 | |
| https://access.redhat.com/errata/RHSA-2018:3586 | |
| https://access.redhat.com/errata/RHSA-2018:3590 | |
| https://access.redhat.com/errata/RHSA-2018:3591 | |
| https://access.redhat.com/errata/RHSA-2018:3643 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14634 | |
| https://security.netapp.com/advisory/ntap-20190204-0002/ | |
| https://security.paloaltonetworks.com/CVE-2018-14634 | |
| https://support.f5.com/csp/article/K20934447?utm_source=f5support&utm_medium=RSS | |
| https://usn.ubuntu.com/3775-1/ | |
| https://usn.ubuntu.com/3775-2/ | |
| https://usn.ubuntu.com/3779-1/ | |
| https://www.exploit-db.com/exploits/45516/ | |
| https://www.openwall.com/lists/oss-security/2018/09/25/4 |
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 | linux | linux_kernel | * |
From (including) 2.6.0 |
Up to (including) 2.6.39.4 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 3.10.0 |
Up to (including) 3.10.102 |
||||
| 运行在以下环境 | |||||||||
| 系统 | linux | linux_kernel | * |
From (including) 4.14.0 |
Up to (including) 4.14.54 |
||||
| 运行在以下环境 | |||||||||
| 系统 | redhat_6 | kernel | * |
Up to (excluding) 0:2.6.32-754.6.3.el6 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | redhat_7 | kernel | * |
Up to (excluding) 0:3.10.0-862.14.4.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | redhat_7 | kernel-rt | * |
Up to (excluding) 0:3.10.0-862.14.4.rt56.821.el7 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | sles_12 | kernel-ec2 | * |
Up to (excluding) 3.12.74-60.64.104 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_14.04_lts | linux | * |
Up to (excluding) 3.13.0-160.210 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04_lts | linux | * |
Up to (excluding) 4.4.0-93.116 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04_lts | linux | * |
Up to (excluding) 4.13.0-16.19 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.10 | linux | * |
Up to (excluding) 4.15.0-20.21 |
|||||
- 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 漏洞武器化
- 补丁情况 官方补丁
- 数据保密性 数据泄露
- 数据完整性 传输被破坏
- 服务器危害 服务器失陷
- 全网数量 N/A
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