Multiple double free vulnerabilities in the (1) agent_sign_data
function in agent.c, (2) channel_request function in channels.c, (3)
ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function
in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in
libssh before 0.5.3 allow remote attackers to cause a denial of
service (crash) and possibly execute arbitrary code via unspecified
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