Vulnerability-Lookup

CNVD-2020-04037

Vulnerability from cnvd - Published: 2020-02-04

Title

Cisco IOS XR BGP EVPN拒绝服务漏洞（CNVD-2020-04037）

Description

Cisco IOS XR是一个完全模块化完全分布式的网络互联操作系统。 Cisco IOS XR 6.6.1及更高版本的边界网关协议(BGP)以太网VPN (EVPN)功能的实现存在拒绝服务漏洞。该漏洞源于对包含特制EVPN属性的BGP更新消息的处理不当。攻击者可利用该漏洞通过发送包含特定畸形属性的BGP EVPN更新消息导致BGP进程意外重新启动，从而可导致拒绝服务。

Severity

中

Patch Name

Cisco IOS XR BGP EVPN拒绝服务漏洞（CNVD-2020-04037）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-20200122-ios-xr-evpn

Reference

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn

Impacted products

Name
Cisco IOS XR >=6.6.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-16020",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2019-16020"
    }
  },
  "description": "Cisco IOS XR\u662f\u4e00\u4e2a\u5b8c\u5168\u6a21\u5757\u5316\u5b8c\u5168\u5206\u5e03\u5f0f\u7684\u7f51\u7edc\u4e92\u8054\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nCisco IOS XR 6.6.1\u53ca\u66f4\u9ad8\u7248\u672c\u7684\u8fb9\u754c\u7f51\u5173\u534f\u8bae(BGP)\u4ee5\u592a\u7f51VPN (EVPN)\u529f\u80fd\u7684\u5b9e\u73b0\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5bf9\u5305\u542b\u7279\u5236EVPN\u5c5e\u6027\u7684BGP\u66f4\u65b0\u6d88\u606f\u7684\u5904\u7406\u4e0d\u5f53\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u5305\u542b\u7279\u5b9a\u7578\u5f62\u5c5e\u6027\u7684BGP EVPN\u66f4\u65b0\u6d88\u606f\u5bfc\u81f4BGP\u8fdb\u7a0b\u610f\u5916\u91cd\u65b0\u542f\u52a8\uff0c\u4ece\u800c\u53ef\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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-04037",
  "openTime": "2020-02-04",
  "patchDescription": "Cisco IOS XR\u662f\u4e00\u4e2a\u5b8c\u5168\u6a21\u5757\u5316\u5b8c\u5168\u5206\u5e03\u5f0f\u7684\u7f51\u7edc\u4e92\u8054\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nCisco IOS XR 6.6.1\u53ca\u66f4\u9ad8\u7248\u672c\u7684\u8fb9\u754c\u7f51\u5173\u534f\u8bae(BGP)\u4ee5\u592a\u7f51VPN (EVPN)\u529f\u80fd\u7684\u5b9e\u73b0\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5bf9\u5305\u542b\u7279\u5236EVPN\u5c5e\u6027\u7684BGP\u66f4\u65b0\u6d88\u606f\u7684\u5904\u7406\u4e0d\u5f53\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u5305\u542b\u7279\u5b9a\u7578\u5f62\u5c5e\u6027\u7684BGP EVPN\u66f4\u65b0\u6d88\u606f\u5bfc\u81f4BGP\u8fdb\u7a0b\u610f\u5916\u91cd\u65b0\u542f\u52a8\uff0c\u4ece\u800c\u53ef\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": "Cisco IOS XR BGP EVPN\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2020-04037\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Cisco IOS XR \u003e=6.6.1"
  },
  "referenceLink": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn",
  "serverity": "\u4e2d",
  "submitTime": "2020-01-23",
  "title": "Cisco IOS XR BGP EVPN\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff08CNVD-2020-04037\uff09"
}

CVE-2019-16020 (GCVE-0-2019-16020)

Vulnerability from cvelistv5 – Published: 2020-01-26 04:30 – Updated: 2024-11-15 17:46

Title

Cisco IOS XR Software BGP EVPN Denial of Service Vulnerabilities

Summary

Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

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 2024-11-15 16:22 UTC

CWE

CWE-399

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 IOS XR Software	Affected: unspecified , < n/a (custom)

Date Public

2020-01-22 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T01:03:32.663Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "20200122 Cisco IOS XR Software BGP EVPN Denial of Service Vulnerabilities",
            "tags": [
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          }
        ],
        "title": "CVE Program Container"
      },
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                  },
                  {
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                  },
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                  }
                ],
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        },
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    "cna": {
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        {
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          "vendor": "Cisco",
          "versions": [
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              "status": "affected",
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            }
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      ],
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      "descriptions": [
        {
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      "exploits": [
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          "lang": "en",
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      "metrics": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
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            "privilegesRequired": "NONE",
            "scope": "CHANGED",
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      ],
      "source": {
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      "title": "Cisco IOS XR Software BGP EVPN Denial of Service Vulnerabilities",
      "x_legacyV4Record": {
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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.