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GHSA-6hrw-x7pr-4mp8
No affected components available
Summary
Stored Cross-Site Scripting (XSS) vulnerability allows attackers to inject malicious scripts into web applications, which can then be executed in the context of other users' browsers. This can lead to unauthorized access to sensitive information, session hijacking, and spreading of malware, impacting user data privacy and application integrity.
Details
A user with rights to modificate the service (e.g. kuiperUser role) can inject XSS Payload into Rule id parameter. Then, after any user with access to this service (e.g. admin) will try make any modifications with the rule (update, run, stop, delete), a payload will act in victim's browser.
The issue appears as the notification to user is made in an insafe way:
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L681
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L716
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L735
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L794
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L809
https://github.com/lf-edge/ekuiper/blob/dbce32d5a195cf1de949b3a6a4e29f0df0f3330d/internal/server/rest.go#L824
Such writing to 'http.ResponseWriter' bypasses HTML escaping that prevents cross-site scripting vulnerabilities.
Because of the some (meybe protection) mechanisms a real exploitation is possible only with limited special characters, but this is enough to construct a strong payload
PoC
- Create a rule with id:
<iframe src="javascript:alert`1337`">
- Just after Rule Submition the Payload shoots:
- Then, when another user (e.g.
admin) will try to do something with this rule (e.g. start), the payload shoots in his context:
Impact
Stored Cross-site Scripting (XSS) vulnerability
Reported by Alexey Kosmachev, Lead Pentester from Bi.Zone
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 impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low 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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