cnvd - cnvd-2020-53817

cnvd-2020-53817

Vulnerability from cnvd

Title: Xen路径遍历漏洞

Description:

Xen是英国剑桥大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。

Xen 4.14版本及之前版本中存在安全漏洞。该漏洞源于事件通道未转为无效时的错误引起的。攻击者可以利用该漏洞导致主机崩溃。

Severity: 中

Patch Name: Xen路径遍历漏洞的补丁

Patch Description:

Xen 4.14版本及之前版本中存在安全漏洞。该漏洞源于事件通道未转为无效时的错误引起的。攻击者可以利用该漏洞导致主机崩溃。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description:

厂商已发布了漏洞修复程序，请及时关注更新： https://xenbits.xen.org/xsa/advisory-338.html

Reference: https://access.redhat.com/security/cve/cve-2020-25597

Impacted products

Name
Xen Xen <=4.14

Show details on source website

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-25597",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-25597"
    }
  },
  "description": "Xen\u662f\u82f1\u56fd\u5251\u6865\u5927\u5b66\u7684\u4e00\u6b3e\u5f00\u6e90\u7684\u865a\u62df\u673a\u76d1\u89c6\u5668\u4ea7\u54c1\u3002\u8be5\u4ea7\u54c1\u80fd\u591f\u4f7f\u4e0d\u540c\u548c\u4e0d\u517c\u5bb9\u7684\u64cd\u4f5c\u7cfb\u7edf\u8fd0\u884c\u5728\u540c\u4e00\u53f0\u8ba1\u7b97\u673a\u4e0a\uff0c\u5e76\u652f\u6301\u5728\u8fd0\u884c\u65f6\u8fdb\u884c\u8fc1\u79fb\uff0c\u4fdd\u8bc1\u6b63\u5e38\u8fd0\u884c\u5e76\u4e14\u907f\u514d\u5b95\u673a\u3002\n\nXen 4.14\u7248\u672c\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4e8b\u4ef6\u901a\u9053\u672a\u8f6c\u4e3a\u65e0\u6548\u65f6\u7684\u9519\u8bef\u5f15\u8d77\u7684\u3002\u653b\u51fb\u8005\u53ef\u4ee5\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u4e3b\u673a\u5d29\u6e83\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://xenbits.xen.org/xsa/advisory-338.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-53817",
  "openTime": "2020-09-25",
  "patchDescription": "Xen\u662f\u82f1\u56fd\u5251\u6865\u5927\u5b66\u7684\u4e00\u6b3e\u5f00\u6e90\u7684\u865a\u62df\u673a\u76d1\u89c6\u5668\u4ea7\u54c1\u3002\u8be5\u4ea7\u54c1\u80fd\u591f\u4f7f\u4e0d\u540c\u548c\u4e0d\u517c\u5bb9\u7684\u64cd\u4f5c\u7cfb\u7edf\u8fd0\u884c\u5728\u540c\u4e00\u53f0\u8ba1\u7b97\u673a\u4e0a\uff0c\u5e76\u652f\u6301\u5728\u8fd0\u884c\u65f6\u8fdb\u884c\u8fc1\u79fb\uff0c\u4fdd\u8bc1\u6b63\u5e38\u8fd0\u884c\u5e76\u4e14\u907f\u514d\u5b95\u673a\u3002\r\n\r\nXen 4.14\u7248\u672c\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4e8b\u4ef6\u901a\u9053\u672a\u8f6c\u4e3a\u65e0\u6548\u65f6\u7684\u9519\u8bef\u5f15\u8d77\u7684\u3002\u653b\u51fb\u8005\u53ef\u4ee5\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u4e3b\u673a\u5d29\u6e83\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": "Xen\u8def\u5f84\u904d\u5386\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Xen Xen \u003c=4.14"
  },
  "referenceLink": "https://access.redhat.com/security/cve/cve-2020-25597",
  "serverity": "\u4e2d",
  "submitTime": "2020-09-23",
  "title": "Xen\u8def\u5f84\u904d\u5386\u6f0f\u6d1e"
}

CVE-2020-25597 (GCVE-0-2020-25597)

Vulnerability from cvelistv5

Published

2020-09-23 21:05

Modified

2024-08-04 15:33

Severity ?

CWE

Summary

An issue was discovered in Xen through 4.14.x. There is mishandling of the constraint that once-valid event channels may not turn invalid. Logic in the handling of event channel operations in Xen assumes that an event channel, once valid, will not become invalid over the life time of a guest. However, operations like the resetting of all event channels may involve decreasing one of the bounds checked when determining validity. This may lead to bug checks triggering, crashing the host. An unprivileged guest may be able to crash Xen, leading to a Denial of Service (DoS) for the entire system. All Xen versions from 4.4 onwards are vulnerable. Xen versions 4.3 and earlier are not vulnerable. Only systems with untrusted guests permitted to create more than the default number of event channels are vulnerable. This number depends on the architecture and type of guest. For 32-bit x86 PV guests, this is 1023; for 64-bit x86 PV guests, and for all ARM guests, this number is 4095. Systems where untrusted guests are limited to fewer than this number are not vulnerable. Note that xl and libxl limit max_event_channels to 1023 by default, so systems using exclusively xl, libvirt+libxl, or their own toolstack based on libxl, and not explicitly setting max_event_channels, are not vulnerable.

References

▼	URL	Tags
	https://xenbits.xen.org/xsa/advisory-338.html	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/	vendor-advisory, x_refsource_FEDORA
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/	vendor-advisory, x_refsource_FEDORA
	https://www.debian.org/security/2020/dsa-4769	vendor-advisory, x_refsource_DEBIAN
	http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html	vendor-advisory, x_refsource_SUSE
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202011-06	vendor-advisory, x_refsource_GENTOO

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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