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GHSA-7mwh-q3xm-qh6p
No affected components available
Summary
The /debug/querylogz and /debug/env pages for vtgate and vttablet do not properly escape user input. The result is that queries executed by Vitess can write HTML into the monitoring page at will.
Details
These pages are rendered using text/template instead of rendering with a proper HTML templating engine.
PoC
Execute any query where part of it is HTML markup, for example as part of a string. To make it easier to observe you might want to make sure the query takes a few seconds to complete, giving you time to refresh the status page.
Example query that can trigger the issue:
UPDATE users
SET
email = CONCAT("<img src=https://cataas.com/cat/says/oops>", users.idUser, "@xxx")
WHERE
email NOT LIKE '%xxx%' AND email != "demo@xxx.com"
Result:
Impact
Anyone looking at the Vitess status page is affected. This would normally be owners / administrators of the Vitess cluster.
Anyone that can influence what text show up in queries can trigger it. This would normally be pretty much everybody interacting with a system that uses Vitess as a backend.
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 high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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