Vulnerability-Lookup

usn-5078-1

Vulnerability from osv_ubuntu

Published

2021-09-15 02:39

Modified

2026-02-10 04:42

Summary

squashfs-tools vulnerability

Details

Richard Weinberger discovered that Squashfs-Tools mishandled certain malformed SQUASHFS files. An attacker could use this vulnerability to write arbitrary files to the filesystem.

References

URL

Type

	https://ubuntu.com/security/notices/USN-5078-1	ADVISORY
	https://ubuntu.com/security/CVE-2021-41072	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-41072",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.3-6ubuntu0.18.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.3-6ubuntu0.18.04.4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.3-6ubuntu0.18.04.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.3-4ubuntu1",
        "1:4.3-4ubuntu2",
        "1:4.3-6",
        "1:4.3-6ubuntu0.18.04.1",
        "1:4.3-6ubuntu0.18.04.2",
        "1:4.3-6ubuntu0.18.04.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.4-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.4-1ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.4-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.4-1",
        "1:4.4-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Richard Weinberger discovered that Squashfs-Tools mishandled certain\nmalformed SQUASHFS files. An attacker could use this vulnerability to\nwrite arbitrary files to the filesystem.\n",
  "id": "USN-5078-1",
  "modified": "2026-02-10T04:42:19Z",
  "published": "2021-09-15T02:39:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5078-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-41072"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "squashfs-tools vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-41072"
  ]
}

ubuntu-cve-2021-41072

Vulnerability from osv_ubuntu

Published

2021-09-14 00:00

Modified

2025-10-10 15:01

Summary

Details

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

Severity

8.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-41072	REPORT
	https://github.com/plougher/squashfs-tools/commit…	REPORT
	https://github.com/plougher/squashfs-tools/issues…	REPORT
	https://ubuntu.com/security/notices/USN-5078-1	ADVISORY
	https://ubuntu.com/security/notices/USN-5078-2	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-41072	REPORT
	https://ubuntu.com/security/notices/USN-5078-3	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.3-3ubuntu2.16.04.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.3-3ubuntu2.16.04.3+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.3-3ubuntu2.16.04.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.2+20130409-2.1",
        "1:4.3-3",
        "1:4.3-3ubuntu1",
        "1:4.3-3ubuntu2",
        "1:4.3-3ubuntu2.16.04.1",
        "1:4.3-3ubuntu2.16.04.2",
        "1:4.3-3ubuntu2.16.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.3-6ubuntu0.18.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.3-6ubuntu0.18.04.4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.3-6ubuntu0.18.04.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.3-4ubuntu1",
        "1:4.3-4ubuntu2",
        "1:4.3-6",
        "1:4.3-6ubuntu0.18.04.1",
        "1:4.3-6ubuntu0.18.04.2",
        "1:4.3-6ubuntu0.18.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.4-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.4-1ubuntu0.3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.4-1ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.4-1",
        "1:4.4-1ubuntu0.1",
        "1:4.4-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "squashfs-tools",
            "binary_version": "1:4.4-2ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "squashfs-tools",
        "purl": "pkg:deb/ubuntu/squashfs-tools@1:4.4-2ubuntu2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.4-2ubuntu2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.",
  "id": "UBUNTU-CVE-2021-41072",
  "modified": "2025-10-10T15:01:23Z",
  "published": "2021-09-14T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-41072"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/plougher/squashfs-tools/commit/e0485802ec72996c20026da320650d8362f555bd"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/plougher/squashfs-tools/issues/72#issuecomment-913833405"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5078-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5078-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-41072"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5078-3"
    }
  ],
  "related": [
    "USN-5078-1",
    "USN-5078-2",
    "USN-5078-3"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-41072"
  ]
}

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.

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

usn-5078-1

Vulnerability from osv_ubuntu

ubuntu-cve-2021-41072

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour