Vulnerability-Lookup

CNVD-2019-01296

Vulnerability from cnvd - Published: 2019-01-14

Title

OpenSSH访问限制绕过漏洞

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。scp Client是其中的一个SCP客户端。 OpenSSH 7.9版本中的scp客户端的scp.c文件存在安全漏洞。远程攻击者可借助.文件名或空文件名利用该漏洞造成SSH服务器绕过访问限制。

Severity

高

Patch Name

OpenSSH访问限制绕过漏洞的补丁

Patch Description

Formal description

厂商已发布漏洞修复程序，请及时关注更新： https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2

Reference

https://nvd.nist.gov/vuln/detail/CVE-2018-20685

Impacted products

Name
Openbsd OpenSSH 7.9

Show details on source website

JSON

To clipboard

{
  "bids": {
    "bid": {
      "bidNumber": "106531"
    }
  },
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-20685"
    }
  },
  "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\u3002scp Client\u662f\u5176\u4e2d\u7684\u4e00\u4e2aSCP\u5ba2\u6237\u7aef\u3002\n\nOpenSSH 7.9\u7248\u672c\u4e2d\u7684scp\u5ba2\u6237\u7aef\u7684scp.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u501f\u52a9.\u6587\u4ef6\u540d\u6216\u7a7a\u6587\u4ef6\u540d\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210SSH\u670d\u52a1\u5668\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\u3002",
  "discovererName": "Harry Sintonen",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2019-01296",
  "openTime": "2019-01-14",
  "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\u3002scp Client\u662f\u5176\u4e2d\u7684\u4e00\u4e2aSCP\u5ba2\u6237\u7aef\u3002\r\n\r\nOpenSSH 7.9\u7248\u672c\u4e2d\u7684scp\u5ba2\u6237\u7aef\u7684scp.c\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u501f\u52a9.\u6587\u4ef6\u540d\u6216\u7a7a\u6587\u4ef6\u540d\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210SSH\u670d\u52a1\u5668\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\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\u8bbf\u95ee\u9650\u5236\u7ed5\u8fc7\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Openbsd OpenSSH 7.9"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2018-20685",
  "serverity": "\u9ad8",
  "submitTime": "2019-01-11",
  "title": "OpenSSH\u8bbf\u95ee\u9650\u5236\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2018-20685 (GCVE-0-2018-20685)

Vulnerability from cvelistv5 – Published: 2019-01-10 00:00 – Updated: 2025-12-17 21:53

Summary

In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-17 21:53 UTC

CWE

n/a
CWE-863 - Incorrect Authorization

Assigner

mitre mitre root

References

14 references

URL	Tags
https://www.debian.org/security/2019/dsa-4387	vendor-advisory
https://usn.ubuntu.com/3885-1/	vendor-advisory
https://github.com/openssh/openssh-portable/commi…
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr…
https://security.netapp.com/advisory/ntap-2019021…
http://www.securityfocus.com/bid/106531	vdb-entry
https://sintonen.fi/advisories/scp-client-multipl…
https://security.gentoo.org/glsa/201903-16	vendor-advisory
https://lists.debian.org/debian-lts-announce/2019…	mailing-list
https://www.oracle.com/technetwork/security-advis…
https://www.oracle.com/technetwork/security-advis…
https://access.redhat.com/errata/RHSA-2019:3702	vendor-advisory
https://security.gentoo.org/glsa/202007-53	vendor-advisory
https://cert-portal.siemens.com/productcert/pdf/s…

Date Public

2019-01-10 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T12:05:17.712Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "DSA-4387",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2019/dsa-4387"
          },
          {
            "name": "USN-3885-1",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/3885-1/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197\u0026r2=1.198\u0026f=h"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20190215-0001/"
          },
          {
            "name": "106531",
            "tags": [
              "vdb-entry",
              "x_transferred"
            ],
            "url": "http://www.securityfocus.com/bid/106531"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt"
          },
          {
            "name": "GLSA-201903-16",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/201903-16"
          },
          {
            "name": "[debian-lts-announce] 20190325 [SECURITY] [DLA 1728-1] openssh security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
          },
          {
            "name": "RHSA-2019:3702",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2019:3702"
          },
          {
            "name": "GLSA-202007-53",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202007-53"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2018-20685",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-17T21:53:24.729008Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-863",
                "description": "CWE-863 Incorrect Authorization",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-17T21:53:56.287Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2019-01-10T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-12-13T00:00:00.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "name": "DSA-4387",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2019/dsa-4387"
        },
        {
          "name": "USN-3885-1",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://usn.ubuntu.com/3885-1/"
        },
        {
          "url": "https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2"
        },
        {
          "url": "https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197\u0026r2=1.198\u0026f=h"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20190215-0001/"
        },
        {
          "name": "106531",
          "tags": [
            "vdb-entry"
          ],
          "url": "http://www.securityfocus.com/bid/106531"
        },
        {
          "url": "https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt"
        },
        {
          "name": "GLSA-201903-16",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/201903-16"
        },
        {
          "name": "[debian-lts-announce] 20190325 [SECURITY] [DLA 1728-1] openssh security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html"
        },
        {
          "url": "https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html"
        },
        {
          "url": "https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html"
        },
        {
          "name": "RHSA-2019:3702",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2019:3702"
        },
        {
          "name": "GLSA-202007-53",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202007-53"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2018-20685",
    "datePublished": "2019-01-10T00:00:00.000Z",
    "dateReserved": "2019-01-10T00:00:00.000Z",
    "dateUpdated": "2025-12-17T21:53:56.287Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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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Action not permitted

CNVD-2019-01296

CVE-2018-20685 (GCVE-0-2018-20685)

Tags

Sightings

Nomenclature

Related by attack behaviour