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|1fccb25e-8451-438c-a2b9-6a021e4d7a31||nghttp2 -- Denial of service due to NULL pointer dereference|
If ALTSVC frame is received by libnghttp2 and it is larger than it can
accept, the pointer field which points to ALTSVC frame payload is left
NULL. Later libnghttp2 attempts to access another field through the
pointer, and gets segmentation fault.
ALTSVC frame is defined by RFC 7838.
The largest frame size libnghttp2 accept is by default 16384 bytes.
Receiving ALTSVC frame is disabled by default. Application has to
enable it explicitly by calling
Transmission of ALTSVC is always enabled, and it does not cause this
ALTSVC frame is expected to be sent by server, and received by client
as defined in RFC 7838.
Client and server are both affected by this vulnerability if the
reception of ALTSVC frame is enabled. As written earlier, it is useless
to enable reception of ALTSVC frame on server side. So, server is
generally safe unless application accidentally enabled the reception of
ge 1.10.0 lt 1.31.1