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

To clipboard

{
  "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 CNA under the mitre root

CNA scorecard E 29/100 over 2175 records in the last 180 days details

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

To clipboard

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          "dateUpdated": "2024-08-05T10:10:05.228Z",
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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",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
              "version": "3.1"
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    "cna": {
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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