低危 xen xen 内存缓冲区边界内操作的限制不恰当
CVE编号
CVE-2021-28689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
x86: Speculative vulnerabilities with bare (non-shim) 32-bit PV guests 32-bit x86 PV guest kernels run in ring 1. At the time when Xen was developed, this area of the i386 architecture was rarely used, which is why Xen was able to use it to implement paravirtualisation, Xen's novel approach to virtualization. In AMD64, Xen had to use a different implementation approach, so Xen does not use ring 1 to support 64-bit guests. With the focus now being on 64-bit systems, and the availability of explicit hardware support for virtualization, fixing speculation issues in ring 1 is not a priority for processor companies. Indirect Branch Restricted Speculation (IBRS) is an architectural x86 extension put together to combat speculative execution sidechannel attacks, including Spectre v2. It was retrofitted in microcode to existing CPUs. For more details on Spectre v2, see: http://xenbits.xen.org/xsa/advisory-254.html However, IBRS does not architecturally protect ring 0 from predictions learnt in ring 1. For more details, see: https://software.intel.com/security-software-guidance/deep-dives/deep-dive-indirect-branch-restricted-speculation Similar situations may exist with other mitigations for other kinds of speculative execution attacks. The situation is quite likely to be similar for speculative execution attacks which have yet to be discovered, disclosed, or mitigated.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://xenbits.xenproject.org/xsa/advisory-370.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 | debian_10 | xen | * | Up to (including) 4.11.4+107-gef32c7afa2-1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_11 | xen | * | Up to (including) 4.14.6-1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_12 | xen | * | Up to (including) 4.17.1+2-gb773c48e36-1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_9 | xen | * | Up to (including) 4.8.5.final+shim4.10.4-1+deb9u12 | |||||
| 运行在以下环境 | |||||||||
| 系统 | debian_sid | xen | * | Up to (including) 4.17.2+55-g0b56bed864-1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_5.2 | xen-libs | * | Up to (excluding) 4.14.5_06-150300.3.35.1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.3 | xen-tools | * | Up to (excluding) 4.14.5_06-150300.3.35.1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | suse_12_SP5 | xen | * | Up to (excluding) 4.12.4_28-3.77.1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | xen | xen | * | Up to (excluding) 4.12.0 | |||||
- 攻击路径 远程
- 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 N/A
- 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-119 | 内存缓冲区边界内操作的限制不恰当 |
| CWE-212 | 敏感数据的不恰当跨边界移除 |
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