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GHSA-wgmr-mf83-7x4j
No affected components available
Description
Invalid HTTP/2 requests (for example, invalid URIs) are incorrectly handled by writing a blocking error response directly from the selector thread. If the client manages to exhaust the HTTP/2 flow control window, or TCP congest the connection, the selector thread will be blocked trying to write the error response. If this is repeated for all the selector threads, the server becomes unresponsive, causing the denial of service.
Impact
A malicious client may render the server unresponsive.
Patches
The fix is available in Jetty versions 9.4.47. 10.0.10, 11.0.10.
Workarounds
No workaround available within Jetty itself. One possible workaround is to filter the requests before sending them to Jetty (for example in a proxy)
For more information
If you have any questions or comments about this advisory:
- Email us at security@webtide.com.
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. 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 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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