Vulnerability-Lookup

CNVD-2018-20962

Vulnerability from cnvd - Published: 2018-10-15

Title

OpenSSH用户枚举漏洞（CNVD-2018-20962）

Description

OpenSSH（OpenBSD Secure Shell）是OpenBSD计划组所维护的一套用于安全访问远程计算机的连接工具。该工具是SSH协议的开源实现，支持对所有的传输进行加密，可有效阻止窃听、连接劫持以及其他网络级的攻击。 OpenSSH 7.8及之前版本中的auth-gss2.c文件存在安全漏洞。远程攻击者可利用该漏洞检测其指定的用户是否存在。

Severity

中

Patch Name

OpenSSH用户枚举漏洞（CNVD-2018-20962）的补丁

Patch Description

Formal description

用户可联系供应商获得补丁信息： https://www.openssh.com/

Reference

https://nvd.nist.gov/vuln/detail/CVE-2018-15919

Impacted products

Name
Openbsd OpenSSH <=7.8

Show details on source website

JSON

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{
  "bids": {
    "bid": {
      "bidNumber": "105163"
    }
  },
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-15919",
      "cveUrl": "http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15919"
    }
  },
  "description": "OpenSSH\uff08OpenBSD Secure Shell\uff09\u662fOpenBSD\u8ba1\u5212\u7ec4\u6240\u7ef4\u62a4\u7684\u4e00\u5957\u7528\u4e8e\u5b89\u5168\u8bbf\u95ee\u8fdc\u7a0b\u8ba1\u7b97\u673a\u7684\u8fde\u63a5\u5de5\u5177\u3002\u8be5\u5de5\u5177\u662fSSH\u534f\u8bae\u7684\u5f00\u6e90\u5b9e\u73b0\uff0c\u652f\u6301\u5bf9\u6240\u6709\u7684\u4f20\u8f93\u8fdb\u884c\u52a0\u5bc6\uff0c\u53ef\u6709\u6548\u963b\u6b62\u7a83\u542c\u3001\u8fde\u63a5\u52ab\u6301\u4ee5\u53ca\u5176\u4ed6\u7f51\u7edc\u7ea7\u7684\u653b\u51fb\u3002\r\n\r\nOpenSSH 7.8\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u7684auth-gss2.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u68c0\u6d4b\u5176\u6307\u5b9a\u7684\u7528\u6237\u662f\u5426\u5b58\u5728\u3002",
  "discovererName": "The Qualys Security Advisory Team",
  "formalWay": "\u7528\u6237\u53ef\u8054\u7cfb\u4f9b\u5e94\u5546\u83b7\u5f97\u8865\u4e01\u4fe1\u606f\uff1a\r\nhttps://www.openssh.com/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-20962",
  "openTime": "2018-10-15",
  "patchDescription": "OpenSSH\uff08OpenBSD Secure Shell\uff09\u662fOpenBSD\u8ba1\u5212\u7ec4\u6240\u7ef4\u62a4\u7684\u4e00\u5957\u7528\u4e8e\u5b89\u5168\u8bbf\u95ee\u8fdc\u7a0b\u8ba1\u7b97\u673a\u7684\u8fde\u63a5\u5de5\u5177\u3002\u8be5\u5de5\u5177\u662fSSH\u534f\u8bae\u7684\u5f00\u6e90\u5b9e\u73b0\uff0c\u652f\u6301\u5bf9\u6240\u6709\u7684\u4f20\u8f93\u8fdb\u884c\u52a0\u5bc6\uff0c\u53ef\u6709\u6548\u963b\u6b62\u7a83\u542c\u3001\u8fde\u63a5\u52ab\u6301\u4ee5\u53ca\u5176\u4ed6\u7f51\u7edc\u7ea7\u7684\u653b\u51fb\u3002\r\n\r\nOpenSSH 7.8\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u7684auth-gss2.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u68c0\u6d4b\u5176\u6307\u5b9a\u7684\u7528\u6237\u662f\u5426\u5b58\u5728\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": "OpenSSH\u7528\u6237\u679a\u4e3e\u6f0f\u6d1e\uff08CNVD-2018-20962\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Openbsd OpenSSH \u003c=7.8"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2018-15919",
  "serverity": "\u4e2d",
  "submitTime": "2018-08-30",
  "title": "OpenSSH\u7528\u6237\u679a\u4e3e\u6f0f\u6d1e\uff08CNVD-2018-20962\uff09"
}

CVE-2018-15919 (GCVE-0-2018-15919)

Vulnerability from cvelistv5 – Published: 2018-08-28 08:00 – Updated: 2025-12-18 11:48

Summary

Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'

Severity

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-18 11:48 UTC

CWE

n/a
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

mitre mitre root

References

3 references

URL	Tags
https://security.netapp.com/advisory/ntap-2018122…	x_refsource_CONFIRM
http://www.securityfocus.com/bid/105163	vdb-entryx_refsource_BID
http://seclists.org/oss-sec/2018/q3/180	x_refsource_MISC

Date Public

2018-08-28 00:00

Show details on NVD website

JSON

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        "metrics": [
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            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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            "other": {
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                ],
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                "timestamp": "2025-12-18T11:48:07.707434Z",
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    ],
    "cna": {
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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.

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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-2018-20962

CVE-2018-15919 (GCVE-0-2018-15919)

Tags

Sightings

Nomenclature

Related by attack behaviour