github - ghsa-q92f-7cwj-w4w5

ghsa-q92f-7cwj-w4w5

Vulnerability from github

Published

2022-05-24 17:35

Modified

2022-10-12 19:00

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system.

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{
  "affected": [],
  "aliases": [
    "CVE-2020-28935"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-12-07T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system.",
  "id": "GHSA-q92f-7cwj-w4w5",
  "modified": "2022-10-12T19:00:39Z",
  "published": "2022-05-24T17:35:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28935"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202101-38"
    },
    {
      "type": "WEB",
      "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt"
    },
    {
      "type": "WEB",
      "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2020-28935.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

cve-2020-28935

Vulnerability from cvelistv5

Published

2020-12-07 21:46

Modified

2024-09-16 23:27

Severity ?

Summary

Local symlink attack in Unbound and NSD

References

▼	URL	Tags
	https://www.nlnetlabs.nl/downloads/unbound/CVE-2020-28935.txt
	https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt
	https://security.gentoo.org/glsa/202101-38	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html	mailing-list
	https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html	mailing-list

Impacted products

Vendor

Product

Version

▼

NLnet Labs

Unbound

Version: <= 1.12.0

NLnet Labs

NSD

Version: <= 4.3.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T16:48:00.719Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2020-28935.txt"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt"
          },
          {
            "name": "GLSA-202101-38",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202101-38"
          },
          {
            "name": "[debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html"
          },
          {
            "name": "[debian-lts-announce] 20230329 [SECURITY] [DLA 3371-1] unbound security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Unbound",
          "vendor": "NLnet Labs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 1.12.0"
            }
          ]
        },
        {
          "product": "NSD",
          "vendor": "NLnet Labs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 4.3.3"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "We would like to thank Mason Loring Bliss for bringing the issue to our attention."
        }
      ],
      "datePublic": "2020-12-01T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as, she could create a symlink in place of the PID file pointing to a file that she would like to erase. If then Unbound/NSD is killed and the PID file is not cleared, upon restarting with root privileges, Unbound/NSD will rewrite any file pointed at by the symlink. This is a local vulnerability that could create a Denial of Service of the system Unbound/NSD is running on. It requires an attacker having access to the limited permission user Unbound/NSD runs as and point through the symlink to a critical file on the system."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-03-29T00:00:00",
        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
      },
      "references": [
        {
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2020-28935.txt"
        },
        {
          "url": "https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt"
        },
        {
          "name": "GLSA-202101-38",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202101-38"
        },
        {
          "name": "[debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00017.html"
        },
        {
          "name": "[debian-lts-announce] 20230329 [SECURITY] [DLA 3371-1] unbound security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00024.html"
        }
      ],
      "title": "Local symlink attack in Unbound and NSD"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2020-28935",
    "datePublished": "2020-12-07T21:46:47.878342Z",
    "dateReserved": "2020-11-18T00:00:00",
    "dateUpdated": "2024-09-16T23:27:01.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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