CVE编号
CVE-2021-28687利用情况
暂无补丁情况
官方补丁披露时间
2021-06-11漏洞描述
HVM soft-reset crashes toolstack libxl requires all data structures passed across its public interface to be initialized before use and disposed of afterwards by calling a specific set of functions. Many internal data structures also require this initialize / dispose discipline, but not all of them. When the "soft reset" feature was implemented, the libxl__domain_suspend_state structure didn't require any initialization or disposal. At some point later, an initialization function was introduced for the structure; but the "soft reset" path wasn't refactored to call the initialization function. When a guest nwo initiates a "soft reboot", uninitialized data structure leads to an assert() when later code finds the structure in an unexpected state. The effect of this is to crash the process monitoring the guest. How this affects the system depends on the structure of the toolstack. For xl, this will have no security-relevant effect: every VM has its own independent monitoring process, which contains no state. The domain in question will hang in a crashed state, but can be destroyed by `xl destroy` just like any other non-cooperating domain. For daemon-based toolstacks linked against libxl, such as libvirt, this will crash the toolstack, losing the state of any in-progress operations (localized DoS), and preventing further administrator operations unless the daemon is configured to restart automatically (system-wide DoS). If crashes "leak" resources, then repeated crashes could use up resources, also causing a system-wide DoS.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。
参考链接 |
|
|---|---|
| https://security.gentoo.org/glsa/202107-30 | |
| https://xenbits.xenproject.org/xsa/advisory-368.txt |
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 | alpine_3.11 | xen | * |
Up to (excluding) 4.13.3-r0 |
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| 运行在以下环境 | |||||||||
| 系统 | alpine_3.12 | xen | * |
Up to (excluding) 4.13.3-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.14 | xen | * |
Up to (excluding) 4.15.0-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_3.15 | xen | * |
Up to (excluding) 4.15.0-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | alpine_edge | xen | * |
Up to (excluding) 4.15.0-r0 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_32 | xen | * |
Up to (excluding) 4.13.2-8.fc32 |
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| 运行在以下环境 | |||||||||
| 系统 | fedora_33 | xen | * |
Up to (excluding) 4.14.1-7.fc33 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_34 | xen | * |
Up to (excluding) 4.14.1-7.fc34 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | xen | * |
Up to (excluding) 4.12.4_09-3.39.3 |
|||||
| 运行在以下环境 | |||||||||
| 系统 | xen | xen | * |
From (including) 4.12 |
Up to (including) 4.14 |
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- 攻击路径 本地
- 攻击复杂度 容易
- 权限要求 无需权限
- 影响范围 有限影响
- EXP成熟度 N/A
- 补丁情况 官方补丁
- 数据保密性 无影响
- 数据完整性 无影响
- 服务器危害 服务器失陷
- 全网数量 N/A
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