Vulnerability-Lookup

CNVD-2021-36558

Vulnerability from cnvd - Published: 2021-05-22

Title

MikroTik RouterOS内存破坏漏洞（CNVD-2021-36558）

Description

MikroTik RouterOS是MikroTik RouterBOARD硬件的操作系统。 MikroTik RouterOS 6.47之前版本中的/nova/bin/lcdstat进程存在内存破坏漏洞。远程认证攻击者可利用该漏洞导致拒绝服务。

Severity

中

Patch Name

MikroTik RouterOS内存破坏漏洞（CNVD-2021-36558）的补丁

Patch Description

MikroTik RouterOS是MikroTik RouterBOARD硬件的操作系统。 MikroTik RouterOS 6.47之前版本中的/nova/bin/lcdstat进程存在内存破坏漏洞。远程认证攻击者可利用该漏洞导致拒绝服务。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://mikrotik.com/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-20254

Impacted products

Name
MicroTik RouterOS <6.47

Show details on source website

JSON

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-20254",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-20254"
    }
  },
  "description": "MikroTik RouterOS\u662fMikroTik RouterBOARD\u786c\u4ef6\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nMikroTik RouterOS 6.47\u4e4b\u524d\u7248\u672c\u4e2d\u7684/nova/bin/lcdstat\u8fdb\u7a0b\u5b58\u5728\u5185\u5b58\u7834\u574f\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u8ba4\u8bc1\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\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://mikrotik.com/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-36558",
  "openTime": "2021-05-22",
  "patchDescription": "MikroTik RouterOS\u662fMikroTik RouterBOARD\u786c\u4ef6\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nMikroTik RouterOS 6.47\u4e4b\u524d\u7248\u672c\u4e2d\u7684/nova/bin/lcdstat\u8fdb\u7a0b\u5b58\u5728\u5185\u5b58\u7834\u574f\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u8ba4\u8bc1\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\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": "MikroTik RouterOS\u5185\u5b58\u7834\u574f\u6f0f\u6d1e\uff08CNVD-2021-36558\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "MicroTik RouterOS \u003c6.47"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-20254",
  "serverity": "\u4e2d",
  "submitTime": "2021-05-19",
  "title": "MikroTik RouterOS\u5185\u5b58\u7834\u574f\u6f0f\u6d1e\uff08CNVD-2021-36558\uff09"
}

CVE-2020-20254 (GCVE-0-2020-20254)

Vulnerability from cvelistv5 – Published: 2021-05-18 13:52 – Updated: 2024-08-04 14:15

Summary

Mikrotik RouterOs before 6.47 (stable tree) suffers from a memory corruption vulnerability in the /nova/bin/lcdstat process. An authenticated remote attacker can cause a Denial of Service (NULL pointer dereference).

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

2 references

URL	Tags
https://github.com/cq674350529/pocs_slides/blob/m…	x_refsource_MISC
http://seclists.org/fulldisclosure/2021/May/14	mailing-listx_refsource_FULLDISC

Show details on NVD website

JSON

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          },
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          },
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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.