SUSE-SU-2018:3781-1

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SUSE-SU-2018:3781-1

Summary: Security update for openssh

Details: This update for openssh fixes the following issues: Following security issues have been fixed: - CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163) - CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) Also the following security related hardening change was done: - Removed arcfour,blowfish,cast from list of default ciphers as they are long discontinued and should no longer be used. (bsc#982273) And the following non-security issues were fixed: - Stop leaking File descriptors (bsc#964336) - sftp-client.c returns wrong error code upon failure (bsc#1091396)

References: https://www.suse.com/support/update/announcement/2018/suse-su-20183781-1/, https://bugzilla.suse.com/1091396, https://bugzilla.suse.com/1105010, https://bugzilla.suse.com/1106163, https://bugzilla.suse.com/964336, https://bugzilla.suse.com/982273, https://www.suse.com/security/cve/CVE-2018-15473