Description (CNA)
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| HAProxy / HAProxy | affected 3.2.0 before 3.2.26; affected 3.3.0 before 3.3.17; affected 3.4.0 before 3.4.6; affected 3.5-dev before 3.5-dev9 |
| HAProxy / HAProxy Enterprise Edition | affected 3.2.0r1 before 3.2r1-378.1259; affected 3.3.0r1 before 3.3r1-377.1005 |
| HAProxy / Kubernetes Ingress Controller | affected 3.2.0 before 3.2.17 |
| Haproxy / Kubernetes Ingress Controller Enterprise | affected 3.2.0 before 3.2.17-ee1; affected 3.0 before 3.0.16-ee17; affected 1.11 before 1.11.14-ee11 |
CWE
CWE-252
References
ADP enrichment
No English description supplied.
No references supplied.