cnvd - cnvd-2020-03171

CNVD-2020-03171

Vulnerability from cnvd - Published: 2020-01-21

Title

Red Hat Enterprise Linux kpatch拒绝服务漏洞

Description

Red Hat Enterprise Linux（RHEL）是美国红帽（Red Hat）公司的一套面向企业用户的Linux操作系统。kpatch是其中的一个内核修补程序。 Red Hat Enterprise Linux 8版本中的kpatch存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。

Severity

中

Formal description

目前厂商尚未提供相关漏洞补丁，请关注厂商主页随时更新： https://github.com/dynup/kpatch

Reference

https://github.com/dynup/kpatch

Impacted products

Name
Red Hat Red Hat Enterprise Linux（RHEL） 8

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-19339",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2019-19339"
    }
  },
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  "formalWay": "\u76ee\u524d\u5382\u5546\u5c1a\u672a\u63d0\u4f9b\u76f8\u5173\u6f0f\u6d1e\u8865\u4e01\uff0c\u8bf7\u5173\u6ce8\u5382\u5546\u4e3b\u9875\u968f\u65f6\u66f4\u65b0\uff1a\r\nhttps://github.com/dynup/kpatch",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-03171",
  "openTime": "2020-01-21",
  "products": {
    "product": "Red Hat Red Hat Enterprise Linux\uff08RHEL\uff09 8"
  },
  "referenceLink": "https://github.com/dynup/kpatch",
  "serverity": "\u4e2d",
  "submitTime": "2019-12-30",
  "title": "Red Hat Enterprise Linux kpatch\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e"
}

CVE-2019-19339 (GCVE-0-2019-19339)

Vulnerability from cvelistv5 – Published: 2020-01-17 18:08 – Updated: 2024-08-05 02:16

Summary

It was found that the Red Hat Enterprise Linux 8 kpatch update did not include the complete fix for CVE-2018-12207. A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU's local cache and system software's Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor. System software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory. Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor's Memory Management Unit (MMU) uses Paging structure entries to translate program's virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and other for data addresses. System software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor's TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE

CWE-805

Assigner

redhat

References

URL

Tags

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	Red Hat	kpatch:	Affected: n/a

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2024-08-05T02:16:46.826Z",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
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Sightings

Author	Source	Type	Date

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.

Action not permitted

CNVD-2020-03171

CVE-2019-19339 (GCVE-0-2019-19339)

Tags

Sightings

Nomenclature