Debian: DLA-3559-1 Moderate: Libssh2 Denial Of Service Issue

CVE-2019-13115

Kevin Backhouse discovered an integer overflow vulnerability in kex.c's
kex_method_diffie_hellman_group_exchange_sha256_key_exchange()
function, which could lead to an out-of-bounds read in the way
packets are read from the server. A remote attacker who compromises
an SSH server may be able to disclose sensitive information or cause
a denial of service condition on the client system when a user
connects to the server.

CVE-2019-17498

Kevin Backhouse discovered that the SSH_MSG_DISCONNECT logic in
packet.c has an integer overflow in a bounds check, thereby enabling
an attacker to specify an arbitrary (out-of-bounds) offset for a
subsequent memory read. A malicious SSH server may be able to
disclose sensitive information or cause a denial of service
condition on the client system when a user connects to the server.

CVE-2020-22218

An issue was discovered in function _libssh2_packet_add(), which