Vulnerability-Lookup

CNVD-2020-52625

Vulnerability from cnvd - Published: 2020-09-18

Title

Xen Linux kernel权限控制漏洞

Description

Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。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 4.13.x及之前版本（x86 PV Guests）中使用的Linux kernel 5.5版本至5.7.9版本存在安全漏洞，该漏洞源于tss_invalidate_io_bitmap的错误处理造成TSS和Xen的I/O位图之间不再同步。攻击者可利用该漏洞获取I/O端口的使用权限。

Severity

高

Patch Name

Xen Linux kernel权限控制漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2

Reference

https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2

Impacted products

Name
['XenSource Xen <=4.13.*', 'Linux Linux kernel >=5.5，<=5.7.9']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-15852",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-15852"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u53d1\u5e03\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002Xen\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 4.13.x\u53ca\u4e4b\u524d\u7248\u672c\uff08x86 PV Guests\uff09\u4e2d\u4f7f\u7528\u7684Linux kernel 5.5\u7248\u672c\u81f35.7.9\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8etss_invalidate_io_bitmap\u7684\u9519\u8bef\u5904\u7406\u9020\u6210TSS\u548cXen\u7684I/O\u4f4d\u56fe\u4e4b\u95f4\u4e0d\u518d\u540c\u6b65\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6I/O\u7aef\u53e3\u7684\u4f7f\u7528\u6743\u9650\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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-52625",
  "openTime": "2020-09-18",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u53d1\u5e03\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002Xen\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 4.13.x\u53ca\u4e4b\u524d\u7248\u672c\uff08x86 PV Guests\uff09\u4e2d\u4f7f\u7528\u7684Linux kernel 5.5\u7248\u672c\u81f35.7.9\u7248\u672c\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8etss_invalidate_io_bitmap\u7684\u9519\u8bef\u5904\u7406\u9020\u6210TSS\u548cXen\u7684I/O\u4f4d\u56fe\u4e4b\u95f4\u4e0d\u518d\u540c\u6b65\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6I/O\u7aef\u53e3\u7684\u4f7f\u7528\u6743\u9650\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 Linux kernel\u6743\u9650\u63a7\u5236\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "XenSource Xen \u003c=4.13.*",
      "Linux Linux kernel \u003e=5.5\uff0c\u003c=5.7.9"
    ]
  },
  "referenceLink": "https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2",
  "serverity": "\u9ad8",
  "submitTime": "2020-07-21",
  "title": "Xen Linux kernel\u6743\u9650\u63a7\u5236\u6f0f\u6d1e"
}

CVE-2020-15852 (GCVE-0-2020-15852)

Vulnerability from cvelistv5 – Published: 2020-07-20 18:54 – Updated: 2024-08-04 13:30

Summary

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

5 references

URL	Tags
http://xenbits.xen.org/xsa/advisory-329.html	x_refsource_MISC
https://github.com/torvalds/linux/commit/cadfad87…	x_refsource_MISC
https://git.kernel.org/cgit/linux/kernel/git/torv…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/07/21/2	mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2020081…	x_refsource_CONFIRM

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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.

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.

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CNVD-2020-52625

CVE-2020-15852 (GCVE-0-2020-15852)

Tags

Sightings

Nomenclature

Related by attack behaviour