中危 qemu qemu 检查时间与使用时间(toctou)的竞争条件
CVE编号
CVE-2021-20181利用情况
暂无补丁情况
官方补丁披露时间
2021-05-14漏洞描述
A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。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 | |||||||||
| 应用 | qemu | qemu | * | Up to (including) 5.2.0 | |||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.16 | qemu | * | Up to (excluding) 6.0.0-r1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.17 | qemu | * | Up to (excluding) 6.0.0-r1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.18 | qemu | * | Up to (excluding) 6.0.0-r1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_edge | qemu | * | Up to (excluding) 6.0.0-r1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_10 | qemu | * | Up to (excluding) 1:3.1+dfsg-8+deb10u9 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_11 | qemu | * | Up to (excluding) 1:5.2+dfsg-4 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_12 | qemu | * | Up to (excluding) 1:5.2+dfsg-4 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_9 | qemu | * | Up to (excluding) 1:2.8+dfsg-6+deb9u13 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_sid | qemu | * | Up to (excluding) 1:5.2+dfsg-4 | |||||
| 运行在以下环境 | |||||||||
| 系统 | kylinos_aarch64_V10SP2 | qemu | * | Up to (excluding) 4.1.0-32.p10.ky10 | |||||
| 运行在以下环境 | |||||||||
| 系统 | kylinos_loongarch64_V10SP1 | qemu-guest-agent | * | Up to (excluding) 4.2.0-34.8.p05.a.ky10 | |||||
| 运行在以下环境 | |||||||||
| 系统 | kylinos_x86_64_V10SP2 | qemu | * | Up to (excluding) 4.1.0-32.p10.ky10 | |||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.2 | qemu-lang | * | Up to (excluding) 4.2.1-lp152.9.9.5 | |||||
| 运行在以下环境 | |||||||||
| 系统 | oracle_7 | oraclelinux-release | * | Up to (excluding) 4.2.1-5.el7 | |||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | qemu | * | Up to (excluding) 3.1.1.1-48.2 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04 | qemu | * | Up to (excluding) 1:2.5+dfsg-5ubuntu10.49 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_16.04.7_lts | qemu | * | Up to (excluding) 1:2.5+dfsg-5ubuntu10.49 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04 | qemu | * | Up to (excluding) 1:2.11+dfsg-1ubuntu7.35 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_18.04.5_lts | qemu | * | Up to (excluding) 1:2.11+dfsg-1ubuntu7.35 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_20.04 | qemu | * | Up to (excluding) 1:4.2-3ubuntu6.12 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_21.04 | qemu | * | Up to (excluding) 1:5.2+dfsg-6ubuntu2 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_21.10 | qemu | * | Up to (excluding) 1:5.2+dfsg-6ubuntu2 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_22.04 | qemu | * | Up to (excluding) 1:5.2+dfsg-6ubuntu2 | |||||
| 运行在以下环境 | |||||||||
| 系统 | ubuntu_22.10 | qemu | * | Up to (excluding) 1:5.2+dfsg-6ubuntu2 | |||||
- 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 未验证
- 补丁情况 官方补丁
- 数据保密性 数据泄露
- 数据完整性 无影响
- 服务器危害 无影响
- 全网数量 N/A
| CWE-ID | 漏洞类型 |
| CWE-362 | 使用共享资源的并发执行不恰当同步问题（竞争条件） |
| CWE-367 | 检查时间与使用时间(TOCTOU)的竞争条件 |
| CWE-416 | 释放后使用 |
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