Vulnerability-Lookup

CNVD-2018-20467

Vulnerability from cnvd - Published: 2018-10-10

Title

Linux kernel KVM拒绝服务漏洞（CNVD-2018-20467）

Description

Linux kernel是美国Linux基金会发布的操作系统Linux所使用的内核。KVM是其中的一个基于内核的虚拟机。基于arm64平台的Linux kernel 4.18.12之前版本中的KVM的t.c文件存在安全漏洞，该漏洞源于程序未能充分的执行访问限制并且PSTATE.M检测机制没有阻止非预期的执行状态。攻击者可利用该漏洞重定向虚拟机监视器的控制流或造成拒绝服务。

Severity

中

Patch Name

Linux kernel KVM拒绝服务漏洞（CNVD-2018-20467）的补丁

Patch Description

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12 https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279 https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d https://www.openwall.com/lists/oss-security/2018/10/02/2

Impacted products

Name
Linux kernel <4.18.12

Show details on source website

JSON

To clipboard

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    "cve": {
      "cveNumber": "CVE-2018-18021"
    }
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  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u53d1\u5e03\u7684\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002KVM\u662f\u5176\u4e2d\u7684\u4e00\u4e2a\u57fa\u4e8e\u5185\u6838\u7684\u865a\u62df\u673a\u3002\r\n\r\n\u57fa\u4e8earm64\u5e73\u53f0\u7684Linux kernel 4.18.12\u4e4b\u524d\u7248\u672c\u4e2d\u7684KVM\u7684t.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u5145\u5206\u7684\u6267\u884c\u8bbf\u95ee\u9650\u5236\u5e76\u4e14PSTATE.M\u68c0\u6d4b\u673a\u5236\u6ca1\u6709\u963b\u6b62\u975e\u9884\u671f\u7684\u6267\u884c\u72b6\u6001\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u91cd\u5b9a\u5411\u865a\u62df\u673a\u76d1\u89c6\u5668\u7684\u63a7\u5236\u6d41\u6216\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002",
  "discovererName": "unKnow",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d",
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  "number": "CNVD-2018-20467",
  "openTime": "2018-10-10",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u53d1\u5e03\u7684\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002KVM\u662f\u5176\u4e2d\u7684\u4e00\u4e2a\u57fa\u4e8e\u5185\u6838\u7684\u865a\u62df\u673a\u3002\r\n\r\n\u57fa\u4e8earm64\u5e73\u53f0\u7684Linux kernel 4.18.12\u4e4b\u524d\u7248\u672c\u4e2d\u7684KVM\u7684t.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u5145\u5206\u7684\u6267\u884c\u8bbf\u95ee\u9650\u5236\u5e76\u4e14PSTATE.M\u68c0\u6d4b\u673a\u5236\u6ca1\u6709\u963b\u6b62\u975e\u9884\u671f\u7684\u6267\u884c\u72b6\u6001\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u91cd\u5b9a\u5411\u865a\u62df\u673a\u76d1\u89c6\u5668\u7684\u63a7\u5236\u6d41\u6216\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Linux kernel KVM\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-20467\uff09\u7684\u8865\u4e01",
  "products": {
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  "serverity": "\u4e2d",
  "submitTime": "2018-10-10",
  "title": "Linux kernel KVM\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2018-20467\uff09"
}

CVE-2018-18021 (GCVE-0-2018-18021)

Vulnerability from cvelistv5 – Published: 2018-10-07 06:00 – Updated: 2024-08-05 11:01

Summary

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

13 references

URL	Tags
https://usn.ubuntu.com/3821-1/	vendor-advisoryx_refsource_UBUNTU
https://github.com/torvalds/linux/commit/2a3f9345…	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2018/…	x_refsource_MISC
https://cdn.kernel.org/pub/linux/kernel/v4.x/Chan…	x_refsource_MISC
https://access.redhat.com/errata/RHSA-2018:3656	vendor-advisoryx_refsource_REDHAT
https://github.com/torvalds/linux/commit/d26c25a9…	x_refsource_MISC
http://www.securityfocus.com/bid/105550	vdb-entryx_refsource_BID
https://usn.ubuntu.com/3821-2/	vendor-advisoryx_refsource_UBUNTU
http://git.kernel.org/cgit/linux/kernel/git/torva…	x_refsource_MISC
http://git.kernel.org/cgit/linux/kernel/git/torva…	x_refsource_MISC
https://www.debian.org/security/2018/dsa-4313	vendor-advisoryx_refsource_DEBIAN
https://usn.ubuntu.com/3931-1/	vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/3931-2/	vendor-advisoryx_refsource_UBUNTU

Date Public

2018-10-07 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.