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GHSA-cf3q-gqg7-3fm9
No affected components available
Summary
Envoy's ext_proc HTTP filter is at risk of crashing if a local reply is sent to the external server due to the filter's life time issue. A known situation is the fail of a websocket handshake will trigger a local reply leading to the crash of Envoy.
PoC
If both websocket and ext_proc are enabled, a failed handshake will trigger a local reply, thus ext_proc will crash.
Mitigation
- Disable websocket traffic
- Change the websocket response from backend to always return
101 Switch protocolbased on RFC. - Apply the patch and the ext_proc filter will not send the local reply that is generated by Envoy to the ext_proc server for processing.
- Apply the patch that the router will cancel the upstream requests when sending a local reply.
Impact
Denial of service
Reporter
Vasilios Syrakis Fernando Cainelli
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
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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