Vulnerability-Lookup

CNVD-2020-44862

Vulnerability from cnvd - Published: 2020-08-07

Title

Cisco IOS XR代码问题漏洞

Description

Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco?IOS XR 7.1.3之前版本、7.2.1之前版本和7.3.1之前版本中的BGP Additional Paths功能存在代码问题漏洞。远程攻击者可通过发送BGP更新利用该漏洞造成BGP进程无法处理新的更新，导致拒绝服务。

Severity

低

Patch Name

Cisco IOS XR代码问题漏洞的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-ErKEqAer

Reference

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-ErKEqAer

Impacted products

Name
['Cisco Cisco IOS XR <7.1.3', 'Cisco Cisco IOS XR <7.2.1', 'Cisco Cisco IOS XR <7.3.1']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-3449",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-3449"
    }
  },
  "description": "Cisco IOS XR\u662f\u7f8e\u56fd\u601d\u79d1\uff08Cisco\uff09\u516c\u53f8\u7684\u4e00\u5957\u4e3a\u5176\u7f51\u7edc\u8bbe\u5907\u5f00\u53d1\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\n\nCisco?IOS XR 7.1.3\u4e4b\u524d\u7248\u672c\u30017.2.1\u4e4b\u524d\u7248\u672c\u548c7.3.1\u4e4b\u524d\u7248\u672c\u4e2d\u7684BGP Additional Paths\u529f\u80fd\u5b58\u5728\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u53d1\u9001BGP\u66f4\u65b0\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210BGP\u8fdb\u7a0b\u65e0\u6cd5\u5904\u7406\u65b0\u7684\u66f4\u65b0\uff0c\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-bgp-ErKEqAer",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-44862",
  "openTime": "2020-08-07",
  "patchDescription": "Cisco IOS XR\u662f\u7f8e\u56fd\u601d\u79d1\uff08Cisco\uff09\u516c\u53f8\u7684\u4e00\u5957\u4e3a\u5176\u7f51\u7edc\u8bbe\u5907\u5f00\u53d1\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\r\n\r\nCisco?IOS XR 7.1.3\u4e4b\u524d\u7248\u672c\u30017.2.1\u4e4b\u524d\u7248\u672c\u548c7.3.1\u4e4b\u524d\u7248\u672c\u4e2d\u7684BGP Additional Paths\u529f\u80fd\u5b58\u5728\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u53d1\u9001BGP\u66f4\u65b0\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210BGP\u8fdb\u7a0b\u65e0\u6cd5\u5904\u7406\u65b0\u7684\u66f4\u65b0\uff0c\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\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Cisco Cisco IOS XR \u003c7.1.3",
      "Cisco Cisco IOS XR \u003c7.2.1",
      "Cisco Cisco IOS XR \u003c7.3.1"
    ]
  },
  "referenceLink": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-ErKEqAer",
  "serverity": "\u4f4e",
  "submitTime": "2020-08-06",
  "title": "Cisco IOS XR\u4ee3\u7801\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2020-3449 (GCVE-0-2020-3449)

Vulnerability from cvelistv5 – Published: 2020-08-17 18:00 – Updated: 2024-11-13 18:15

Title

Cisco IOS XR Software Additional Paths Denial of Service Vulnerability

Summary

A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent authorized users from monitoring the BGP status and cause the BGP process to stop processing new updates, resulting in a denial of service (DOS) condition. The vulnerability is due to an incorrect calculation of lexicographical order when displaying additional path information within Cisco IOS XR Software, which causes an infinite loop. An attacker could exploit this vulnerability by sending a specific BGP update from a BGP neighbor peer session of an affected device; an authorized user must then issue a show bgp command for the vulnerability to be exploited. A successful exploit could allow the attacker to prevent authorized users from properly monitoring the BGP status and prevent BGP from processing new updates, resulting in outdated information in the routing and forwarding tables.

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-11-13 17:24 UTC

CWE

CWE-754

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: n/a

Date Public

2020-08-05 00:00

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T07:37:54.036Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        ],
        "title": "CVE Program Container"
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                "id": "CVE-2020-3449",
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          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
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      "metrics": [
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
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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.