Vulnerability-Lookup

UBUNTU-CVE-2021-29488 (CVE-2021-29488)

Vulnerability from osv_ubuntu – Published: 2021-05-07 15:15 – Updated: 2025-10-24 04:50 – Source website

Details

SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the filesystem.renamer() function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.

Severity

4.3 (Medium)


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

5.3 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-29488	REPORT
	https://github.com/sabnzbd/sabnzbd/security/advis…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-29488	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sabnzbdplus",
            "binary_version": "0.7.20+dfsg-1"
          },
          {
            "binary_name": "sabnzbdplus-theme-classic",
            "binary_version": "0.7.20+dfsg-1"
          },
          {
            "binary_name": "sabnzbdplus-theme-iphone",
            "binary_version": "0.7.20+dfsg-1"
          },
          {
            "binary_name": "sabnzbdplus-theme-mobile",
            "binary_version": "0.7.20+dfsg-1"
          },
          {
            "binary_name": "sabnzbdplus-theme-plush",
            "binary_version": "0.7.20+dfsg-1"
          },
          {
            "binary_name": "sabnzbdplus-theme-smpl",
            "binary_version": "0.7.20+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "sabnzbdplus",
        "purl": "pkg:deb/ubuntu/sabnzbdplus@0.7.20+dfsg-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.20-1",
        "0.7.20+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sabnzbdplus",
            "binary_version": "2.3.2+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "sabnzbdplus",
        "purl": "pkg:deb/ubuntu/sabnzbdplus@2.3.2+dfsg-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.1+dfsg-1",
        "2.3.1+dfsg-1",
        "2.3.2+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sabnzbdplus",
            "binary_version": "3.0.0~0git20200408+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "sabnzbdplus",
        "purl": "pkg:deb/ubuntu/sabnzbdplus@3.0.0~0git20200408+dfsg-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.6+dfsg-1",
        "2.3.6+dfsg-1build1",
        "2.3.6+dfsg-1ubuntu1",
        "3.0.0~0git20200408+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sabnzbdplus",
            "binary_version": "3.5.1+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "sabnzbdplus",
        "purl": "pkg:deb/ubuntu/sabnzbdplus@3.5.1+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.1+dfsg-1",
        "3.4.2+dfsg-1",
        "3.4.2+dfsg-2",
        "3.5.0+dfsg-1",
        "3.5.0+dfsg-2",
        "3.5.1+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the `filesystem.renamer()` function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.",
  "id": "UBUNTU-CVE-2021-29488",
  "modified": "2025-10-24T04:50:16Z",
  "published": "2021-05-07T15:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29488"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sabnzbd/sabnzbd/security/advisories/GHSA-jwj3-wrvf-v3rp"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-29488"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-29488"
  ]
}

CVE-2021-29488 (GCVE-0-2021-29488)

Vulnerability from cvelistv5 – Published: 2021-05-07 15:00 – Updated: 2024-08-03 22:11

Title

Creation of files outside the Download Folder through malicious PAR2 files

Summary

SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the `filesystem.renamer()` function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.

Severity

4.3 (Medium)


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

CWE

CWE-23 - Relative Path Traversal

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/sabnzbd/sabnzbd/security/advis…	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
sabnzbd	sabnzbd	Affected: < 3.0.0
sabnzbd	sabnzbd	Affected: < 3.2.1

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2024-08-03T22:11:05.402Z",
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            ],
            "url": "https://github.com/sabnzbd/sabnzbd/security/advisories/GHSA-jwj3-wrvf-v3rp"
          }
        ],
        "title": "CVE Program Container"
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    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "Windows"
          ],
          "product": "sabnzbd",
          "vendor": "sabnzbd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.0.0"
            }
          ]
        },
        {
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            "All other OSes"
          ],
          "product": "sabnzbd",
          "vendor": "sabnzbd",
          "versions": [
            {
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              "version": "\u003c 3.2.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
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            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
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            }
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      ],
      "providerMetadata": {
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      ],
      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "Creation of files outside the Download Folder through malicious PAR2 files",
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        },
        "affects": {
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                      "version": {
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            }
          ]
        },
        "impact": {
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            "attackComplexity": "LOW",
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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.