gsd-2021-21300
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.
Aliases
Aliases
CVE-2021-21300


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-21300",
    "description": "Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won\u0027t work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.",
    "id": "GSD-2021-21300",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-21300.html",
      "https://ubuntu.com/security/CVE-2021-21300",
      "https://advisories.mageia.org/CVE-2021-21300.html",
      "https://security.archlinux.org/CVE-2021-21300",
      "https://alas.aws.amazon.com/cve/html/CVE-2021-21300.html",
      "https://packetstormsecurity.com/files/cve/CVE-2021-21300"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21300"
      ],
      "details": "Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won\u0027t work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.",
      "id": "GSD-2021-21300",
      "modified": "2023-12-13T01:23:10.982132Z",
      "schema_version": "1.4.0"
    }
  },
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      "affects": {
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          "vendor_data": [
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              "product": {
                "product_data": [
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                    "product_name": "git",
                    "version": {
                      "version_data": [
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                          "version_value": "\u003e= 2.14.2, \u003c 2.17.62.17.6"
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                          "version_value": "\u003e= 2.18.0, \u003c 2.18.5"
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                          "version_value": "\u003e= 2.19.0, \u003c 2.19.6"
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                          "version_value": "\u003e= 2.20.0, \u003c 2.20.5"
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                          "version_value": "\u003e= 2.21.0, \u003c 2.21.4"
                        },
                        {
                          "version_value": "\u003e= 2.22.0, \u003c 2.22.5"
                        },
                        {
                          "version_value": "\u003e= 2.23.0, \u003c 2.23.4"
                        },
                        {
                          "version_value": "\u003e= 2.24.0, \u003c 2.24.4"
                        },
                        {
                          "version_value": "\u003e= 2.25.0, \u003c 2.25.5"
                        },
                        {
                          "version_value": "\u003e= 2.26.0, \u003c 2.26.3"
                        },
                        {
                          "version_value": "\u003e= 2.27.0, \u003c 2.27.1"
                        },
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                          "version_value": "\u003e= 2.28.0, \u003c 2.28.1"
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            "value": "Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won\u0027t work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6."
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      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
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        }
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                "value": "CWE-59 Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
              }
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        ]
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            "name": "https://github.com/git/git/security/advisories/GHSA-8prw-h3cq-mghm",
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          {
            "name": "https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks",
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            "url": "https://git-scm.com/docs/git-config#Documentation/git-config.txt-coresymlinks"
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          },
          {
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            "name": "20210427 APPLE-SA-2021-04-26-10 Xcode 12.5",
            "refsource": "FULLDISC",
            "url": "http://seclists.org/fulldisclosure/2021/Apr/60"
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            "url": "https://security.gentoo.org/glsa/202104-01"
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            "name": "http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html",
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            "url": "http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html"
          },
          {
            "name": "[debian-lts-announce] 20221010 [SECURITY] [DLA 3145-1] git security update",
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            "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html"
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        "discovery": "UNKNOWN"
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              "refsource": "MISC",
              "tags": [
                "Exploit",
                "Third Party Advisory",
                "VDB Entry"
              ],
              "url": "http://packetstormsecurity.com/files/163978/Git-LFS-Clone-Command-Execution.html"
            },
            {
              "name": "[debian-lts-announce] 20221010 [SECURITY] [DLA 3145-1] git security update",
              "refsource": "MLIST",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.debian.org/debian-lts-announce/2022/10/msg00014.html"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "HIGH",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.1,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 4.9,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.6,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-12-06T21:38Z",
      "publishedDate": "2021-03-09T20:15Z"
    }
  }
}


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