CVE-2021-43815: Github.com/grafana/grafana Path Traversal Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7533-c8qv-jm9m",
  "modified" : "2024-05-14T22:11:20Z",
  "published" : "2024-05-14T22:11:20Z",
  "aliases" : [ "CVE-2021-43815" ],
  "summary" : "Grafana directory traversal for .cvs files",
  "details" : "Today we are releasing Grafana `8.3.2` and `7.5.12`. This patch release includes a moderate severity security fix for directory traversal for arbitrary `.csv` files. It only affects instances that have the developer testing tool called [TestData DB data source](https://grafana.com/docs/grafana/latest/datasources/testdata/) enabled and configured.\n\nThe vulnerability is limited in scope, and only allows access to files with the extension `.csv` to **authenticated users only.**\n\nThis is a follow-up patch release to our recent [CVE-2021-43798](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43798) release. If you haven’t read about that high severity security fix, we recommend that you review the [initial blog post](https://grafana.com/blog/2021/12/07/grafana-8.3.1-8.2.7-8.1.8-and-8.0.7-released-with-high-severity-security-fix/), along with our [update on the 0day](https://grafana.com/blog/2021/12/08/an-update-on-0day-cve-2021-43798-grafana-directory-traversal/).\n\nGiven the attention CVE-2021-43798 has brought, there’s a risk that additional researchers will find CVE-2021-43813. Out of an abundance of caution and given that both CVE-2021-43813 and CVE-2021-pending are only CVSS Score 4.3 Moderate CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N through their limited scope we are immediately releasing to the public, and on a Friday.\n\nWe identified several vulnerability issues in the last few weeks, and at a higher rate than in the years before. The infosec industry usually comes together after a few CVEs and we benefit from that extra scrutiny. Although it can be difficult, ultimately it's for the overall benefit of Grafana and the community. Please know that this is a top priority for us. We are spending significant resources on this in the remainder of 2021 already, including full outside assessment. We will continue and increase this investment in 2022 and beyond.\n\nRelease 8.3.2, only containing security fixes:\n\n- [Download Grafana 8.3.2](https://grafana.com/grafana/download/8.3.2)\n- [Release notes](https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-3-2/)\n\nRelease 7.5.12, only containing security fixes:\n\n- [Download Grafana 7.5.12](https://grafana.com/grafana/download/7.5.12)\n- [Release notes](https://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-12/)\n\n## Directory Traversal [CVE-2021-43815](https://github.com/grafana/grafana/security/advisories/GHSA-7533-c8qv-jm9m)\n\n\n### Summary \n\nCVSS Score: 4.3 Moderate CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N\n\nOn 2021-12-09, GitHub Security Labs notified us of a vulnerability through which authenticated users could read out fully lowercase or fully uppercase `.md` files through directory traversal. Doing our own follow-up investigation we found a related vulnerability through which authenticated users could read out arbitrary `.csv` files through directory traversal. Thanks to our defense-in-depth approach, at no time has [Grafana Cloud](https://grafana.com/cloud) been vulnerable.\n\n**The vulnerable URL path is**: `/api/ds/query`\n\n### Affected versions with moderate severity \n\nCVE-2021-43815: Grafana 8.0.0-beta3 - 8.3.1\n\n### Solutions and mitigations\n\nAll installations between 5.0.0 and 8.3.1 should be upgraded as soon as possible.\n\nIf you can not upgrade, running a reverse proxy in front of Grafana that normalizes the PATH of the request will mitigate the vulnerability. The proxy will have to also be able to handle url encoded paths. \n\nThanks to our defense-in-depth approach, [Grafana Cloud](https://grafana.com/cloud) instances have not been affected by the vulnerability.\n\n### Timeline and postmortem\n\nHere is a detailed timeline starting from when we originally learned of the issue. All times in UTC.\n\n* 2021-12-09 16:07: As part of investigation of the [CVE-2021-43813](https://github.com/grafana/grafana/security/advisories/GHSA-c3q8-26ph-9g2q) we have discovered that .csv files are affected and can be read out via /api/ds/query\n* 2021-12-09 16:10: PR with a possible fix the markdown path traversal is raised in private mirror repo\n* 2021-12-09 19:05: Fix confirmed\n* 2021-12-09 23:00: Decision release to direct to public on 2021-12-10 14:30 UTC\n* 2021-12-09 23:36: Announcement email sent to customers\n* 2021-12-10 10:11: Decision to split out `.csv` vulnerability into its own CVE\n\n\n### Acknowledgement\n\nWe would like to thank the [GitHub Security Lab team](https://securitylab.github.com/) for responsibly disclosing CVE-2021-43813 to us.\n\n## Reporting security Issues\n\nIf you think you have found a security vulnerability, please send a report to [security@grafana.com](mailto:security@grafana.com). This address can be used for all of\nGrafana Labs' open source and commercial products (including but not limited to Grafana, Grafana Cloud, Grafana Enterprise, and grafana.com). We can accept only vulnerability reports at this address. We would prefer that you encrypt your message to us by using our PGP key. The key fingerprint is\n\nF988 7BEA 027A 049F AE8E  5CAA D125 8932 BE24 C5CA\n\nThe key is available from [keyserver.ubuntu.com](https://keyserver.ubuntu.com/pks/lookup?search=0xF9887BEA027A049FAE8E5CAAD1258932BE24C5CA&fingerprint=on&op=index).\n\n## Security announcements\n\nWe maintain a [security category on our blog](https://grafana.com/tags/security/), where we will always post a summary, remediation, and mitigation details for any patch containing security fixes. \n\nYou can also subscribe to our [RSS feed](https://grafana.com/tags/security/index.xml).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0-beta3"
      }, {
        "fixed" : "8.3.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 8.3.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/security/advisories/GHSA-7533-c8qv-jm9m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43815"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/commit/d6ec6f8ad28f0212e584406730f939105ff6c6d3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/commit/fd48aee61e4328aae8d5303a9efd045fa0ca308d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grafana/grafana"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v8.3.2"
  }, {
    "type" : "WEB",
    "url" : "https://grafana.com/blog/2021/12/10/grafana-8.3.2-and-7.5.12-released-with-moderate-severity-security-fix"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20220107-0006"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2021/12/10/4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-14T22:11:20Z",
    "nvd_published_at" : "2021-12-10T21:15:00Z"
  }
}