Vulnerability-Lookup

CNVD-2020-50555

Vulnerability from cnvd - Published: 2020-09-07

Title

Cisco NX-OS拒绝服务漏洞（CNVD-2020-50555）

Description

Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。TCP（Transmission Control Protocol,传输控制协议）是一种面向连接的、可靠的、基于字节流的传输层通信协议，由IETF的RFC 793定义。 Cisco NX-OS Border Gateway Protocol (BGP) Multicast VPN (MVPN) 组件存在安全漏洞，该漏洞是由于对特定类型的BGP MVPN更新消息的解析错误造成的，攻击者可以通过将此BGP MVPN更新消息发送到目标设备来利用此漏洞。

Severity

中

Patch Name

Cisco NX-OS拒绝服务漏洞（CNVD-2020-50555）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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-3398

Impacted products

Name
Cisco NX-OS Border Gateway Protocol (BGP) Multicast VPN (MVPN)

Show details on source website

JSON

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    "cve": {
      "cveNumber": "CVE-2020-3398",
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  "number": "CNVD-2020-50555",
  "openTime": "2020-09-07",
  "patchDescription": "Cisco NX-OS Software\u662f\u7f8e\u56fd\u601d\u79d1\uff08Cisco\uff09\u516c\u53f8\u7684\u4e00\u5957\u4ea4\u6362\u673a\u4f7f\u7528\u7684\u6570\u636e\u4e2d\u5fc3\u7ea7\u64cd\u4f5c\u7cfb\u7edf\u8f6f\u4ef6\u3002TCP\uff08Transmission Control Protocol,\u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff09\u662f\u4e00\u79cd\u9762\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760\u7684\u3001\u57fa\u4e8e\u5b57\u8282\u6d41\u7684\u4f20\u8f93\u5c42\u901a\u4fe1\u534f\u8bae\uff0c\u7531IETF\u7684RFC 793\u5b9a\u4e49\u3002\r\n\r\nCisco NX-OS Border Gateway Protocol (BGP) Multicast VPN (MVPN) \u7ec4\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8e\u5bf9\u7279\u5b9a\u7c7b\u578b\u7684BGP MVPN\u66f4\u65b0\u6d88\u606f\u7684\u89e3\u6790\u9519\u8bef\u9020\u6210\u7684\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u901a\u8fc7\u5c06\u6b64BGP MVPN\u66f4\u65b0\u6d88\u606f\u53d1\u9001\u5230\u76ee\u6807\u8bbe\u5907\u6765\u5229\u7528\u6b64\u6f0f\u6d1e\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",
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  "products": {
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  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-3398",
  "serverity": "\u4e2d",
  "submitTime": "2020-08-27",
  "title": "Cisco NX-OS\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2020-50555\uff09"
}

CVE-2020-3398 (GCVE-0-2020-3398)

Vulnerability from cvelistv5 – Published: 2020-08-27 15:40 – Updated: 2024-11-13 18:10

Title

Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session Denial of Service Vulnerability

Summary

A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a BGP session to repeatedly reset, causing a partial denial of service (DoS) condition due to the BGP session being down. The vulnerability is due to incorrect parsing of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause the BGP peer connections to reset, which could lead to BGP route instability and impact traffic. The incoming BGP MVPN update message is valid but is parsed incorrectly by the NX-OS device, which could send a corrupted BGP update to the configured BGP peer. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system.

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-11-13 17:13 UTC

CWE

CWE-20

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://tools.cisco.com/security/center/content/C…	vendor-advisoryx_refsource_CISCO

Impacted products

1 product

Vendor	Product	Version
Cisco	Cisco NX-OS Software	Affected: n/a

Date Public

2020-08-26 00:00

Show details on NVD website

JSON

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{
  "containers": {
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T07:30:58.383Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "name": "20200826 Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session Denial of Service Vulnerability",
            "tags": [
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            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp"
          }
        ],
        "title": "CVE Program Container"
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      {
        "metrics": [
          {
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              "content": {
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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.

Action not permitted

CNVD-2020-50555

CVE-2020-3398 (GCVE-0-2020-3398)

Tags

Sightings

Nomenclature

Related by attack behaviour