Asymmetric denial of service In nghttp2
Description
In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Component | Affected version | Patched versions |
|---|---|---|---|
 alpine v3.9 | 1.35.1-r2 | ||
alpine v3.11 | 12.20.1-r0 | ||
alpine v3.20 | 12.18.0-r0 | ||
alpine v3.22 | 1.41.0-r0 | ||
alpine v3.14 | 12.18.0-r0 | ||
 debian 13 | 10.21.0~dfsg-1 | ||
alpine v3.17 | 1.41.0-r0 | ||
alpine v3.12 | 1.41.0-r0 | ||
alpine v3.16 | 1.41.0-r0 | ||
alpine v3.18 | 1.41.0-r0 |
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Aliases
References