Vulnerability-Lookup

CNVD-2020-50123

Vulnerability from cnvd - Published: 2020-09-02

Title

Zsh权限提升漏洞（CNVD-2020-50123）

Description

Zsh是一款可用作交互式登录的shell及脚本编写的命令解释器。 Zsh 5.8之前版本中存在安全漏洞，该漏洞源于程序未能覆盖原来存储的uid。攻击者可利用该漏洞恢复原来的权限。

Severity

高

Patch Name

Zsh权限提升漏洞（CNVD-2020-50123）的补丁

Patch Description

Zsh是一款可用作交互式登录的shell及脚本编写的命令解释器。 Zsh 5.8之前版本中存在安全漏洞，该漏洞源于程序未能覆盖原来存储的uid。攻击者可利用该漏洞恢复原来的权限。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://www.zsh.org/mla/zsh-announce/141

Reference

https://access.redhat.com/errata/RHSA-2020:0892; http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20044

Impacted products

Name
Zsh Zsh <5.8

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2019-20044",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2019-20044"
    }
  },
  "description": "Zsh\u662f\u4e00\u6b3e\u53ef\u7528\u4f5c\u4ea4\u4e92\u5f0f\u767b\u5f55\u7684shell\u53ca\u811a\u672c\u7f16\u5199\u7684\u547d\u4ee4\u89e3\u91ca\u5668\u3002\n\nZsh 5.8\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u8986\u76d6\u539f\u6765\u5b58\u50a8\u7684uid\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6062\u590d\u539f\u6765\u7684\u6743\u9650\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://www.zsh.org/mla/zsh-announce/141",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2020-50123",
  "openTime": "2020-09-02",
  "patchDescription": "Zsh\u662f\u4e00\u6b3e\u53ef\u7528\u4f5c\u4ea4\u4e92\u5f0f\u767b\u5f55\u7684shell\u53ca\u811a\u672c\u7f16\u5199\u7684\u547d\u4ee4\u89e3\u91ca\u5668\u3002\r\n\r\nZsh 5.8\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u672a\u80fd\u8986\u76d6\u539f\u6765\u5b58\u50a8\u7684uid\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6062\u590d\u539f\u6765\u7684\u6743\u9650\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": "Zsh\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2020-50123\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Zsh Zsh \u003c5.8"
  },
  "referenceLink": "https://access.redhat.com/errata/RHSA-2020:0892; http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20044",
  "serverity": "\u9ad8",
  "submitTime": "2020-03-19",
  "title": "Zsh\u6743\u9650\u63d0\u5347\u6f0f\u6d1e\uff08CNVD-2020-50123\uff09"
}

CVE-2019-20044 (GCVE-0-2019-20044)

Vulnerability from cvelistv5 – Published: 2020-02-24 13:09 – Updated: 2024-08-05 02:32

Summary

In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid().

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root Scorecard

References

20 references

URL	Tags
http://zsh.sourceforge.net/releases.html	x_refsource_MISC
https://github.com/XMB5/zsh-privileged-upgrade	x_refsource_MISC
https://www.zsh.org/mla/zsh-announce/141	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202003-55	vendor-advisoryx_refsource_GENTOO
https://support.apple.com/kb/HT211170	x_refsource_CONFIRM
https://support.apple.com/kb/HT211175	x_refsource_CONFIRM
https://support.apple.com/kb/HT211171	x_refsource_CONFIRM
https://support.apple.com/kb/HT211168	x_refsource_CONFIRM
http://seclists.org/fulldisclosure/2020/May/49	mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2020/May/55	mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2020/May/53	mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2020/May/59	mailing-listx_refsource_FULLDISC
https://support.apple.com/HT211168	x_refsource_CONFIRM
https://support.apple.com/HT211170	x_refsource_CONFIRM
https://support.apple.com/HT211171	x_refsource_CONFIRM
https://support.apple.com/HT211175	x_refsource_CONFIRM
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T02:32:10.480Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://zsh.sourceforge.net/releases.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/XMB5/zsh-privileged-upgrade"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.zsh.org/mla/zsh-announce/141"
          },
          {
            "name": "[debian-lts-announce] 20200302 [SECURITY] [DLA 2117-1] zsh security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html"
          },
          {
            "name": "FEDORA-2020-3f38f3e517",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/"
          },
          {
            "name": "FEDORA-2020-9009363f0f",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/"
          },
          {
            "name": "GLSA-202003-55",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202003-55"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT211170"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT211175"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT211171"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/kb/HT211168"
          },
          {
            "name": "20200529 APPLE-SA-2020-05-26-1 iOS 13.5 and iPadOS 13.5",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/May/49"
          },
          {
            "name": "20200529 APPLE-SA-2020-05-26-5 watchOS 6.2.5",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/May/55"
          },
          {
            "name": "20200529 APPLE-SA-2020-05-26-3 macOS Catalina 10.15.5, Security Update 2020-003 Mojave, Security Update 2020-003 High Sierra",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/May/53"
          },
          {
            "name": "20200529 APPLE-SA-2020-05-26-4 tvOS 13.4.5",
            "tags": [
              "mailing-list",
              "x_refsource_FULLDISC",
              "x_transferred"
            ],
            "url": "http://seclists.org/fulldisclosure/2020/May/59"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/HT211168"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/HT211170"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/HT211171"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://support.apple.com/HT211175"
          },
          {
            "name": "[debian-lts-announce] 20201201 [SECURITY] [DLA 2470-1] zsh security update",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid()."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-12-01T06:06:16.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "http://zsh.sourceforge.net/releases.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/XMB5/zsh-privileged-upgrade"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.zsh.org/mla/zsh-announce/141"
        },
        {
          "name": "[debian-lts-announce] 20200302 [SECURITY] [DLA 2117-1] zsh security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html"
        },
        {
          "name": "FEDORA-2020-3f38f3e517",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/"
        },
        {
          "name": "FEDORA-2020-9009363f0f",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/"
        },
        {
          "name": "GLSA-202003-55",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202003-55"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/kb/HT211170"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/kb/HT211175"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/kb/HT211171"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/kb/HT211168"
        },
        {
          "name": "20200529 APPLE-SA-2020-05-26-1 iOS 13.5 and iPadOS 13.5",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/May/49"
        },
        {
          "name": "20200529 APPLE-SA-2020-05-26-5 watchOS 6.2.5",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/May/55"
        },
        {
          "name": "20200529 APPLE-SA-2020-05-26-3 macOS Catalina 10.15.5, Security Update 2020-003 Mojave, Security Update 2020-003 High Sierra",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/May/53"
        },
        {
          "name": "20200529 APPLE-SA-2020-05-26-4 tvOS 13.4.5",
          "tags": [
            "mailing-list",
            "x_refsource_FULLDISC"
          ],
          "url": "http://seclists.org/fulldisclosure/2020/May/59"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/HT211168"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/HT211170"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/HT211171"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://support.apple.com/HT211175"
        },
        {
          "name": "[debian-lts-announce] 20201201 [SECURITY] [DLA 2470-1] zsh security update",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2019-20044",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid()."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "http://zsh.sourceforge.net/releases.html",
              "refsource": "MISC",
              "url": "http://zsh.sourceforge.net/releases.html"
            },
            {
              "name": "https://github.com/XMB5/zsh-privileged-upgrade",
              "refsource": "MISC",
              "url": "https://github.com/XMB5/zsh-privileged-upgrade"
            },
            {
              "name": "https://www.zsh.org/mla/zsh-announce/141",
              "refsource": "MISC",
              "url": "https://www.zsh.org/mla/zsh-announce/141"
            },
            {
              "name": "[debian-lts-announce] 20200302 [SECURITY] [DLA 2117-1] zsh security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2020/03/msg00004.html"
            },
            {
              "name": "FEDORA-2020-3f38f3e517",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FP64FFIZI2CKQOEAOI5A72PVQULE7ZZC/"
            },
            {
              "name": "FEDORA-2020-9009363f0f",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PN5V7MPHRRP7QNHOEK56S7QGRU53WUN6/"
            },
            {
              "name": "GLSA-202003-55",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202003-55"
            },
            {
              "name": "https://support.apple.com/kb/HT211170",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT211170"
            },
            {
              "name": "https://support.apple.com/kb/HT211175",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT211175"
            },
            {
              "name": "https://support.apple.com/kb/HT211171",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT211171"
            },
            {
              "name": "https://support.apple.com/kb/HT211168",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT211168"
            },
            {
              "name": "20200529 APPLE-SA-2020-05-26-1 iOS 13.5 and iPadOS 13.5",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/May/49"
            },
            {
              "name": "20200529 APPLE-SA-2020-05-26-5 watchOS 6.2.5",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/May/55"
            },
            {
              "name": "20200529 APPLE-SA-2020-05-26-3 macOS Catalina 10.15.5, Security Update 2020-003 Mojave, Security Update 2020-003 High Sierra",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/May/53"
            },
            {
              "name": "20200529 APPLE-SA-2020-05-26-4 tvOS 13.4.5",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/May/59"
            },
            {
              "name": "https://support.apple.com/HT211168",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/HT211168"
            },
            {
              "name": "https://support.apple.com/HT211170",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/HT211170"
            },
            {
              "name": "https://support.apple.com/HT211171",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/HT211171"
            },
            {
              "name": "https://support.apple.com/HT211175",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/HT211175"
            },
            {
              "name": "[debian-lts-announce] 20201201 [SECURITY] [DLA 2470-1] zsh security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2019-20044",
    "datePublished": "2020-02-24T13:09:43.000Z",
    "dateReserved": "2019-12-27T00:00:00.000Z",
    "dateUpdated": "2024-08-05T02:32:10.480Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

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.

Action not permitted

CNVD-2020-50123

CVE-2019-20044 (GCVE-0-2019-20044)

Tags

Sightings

Nomenclature

Related by attack behaviour