SUSE-SU-2018:3540-1

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SUSE-SU-2018:3540-1

Summary: Security update for openssh

Details: This update for openssh fixes the following issues: Security issues 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-2017-15906: The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode, which allowed attackers to create zero-length files. (bsc#1065000, bsc#1106726) - CVE-2016-10708: sshd allowed remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c. (bsc#1076957) - 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) - CVE-2016-10012: Removed pre-auth compression support from the server to prevent possible cryptographic attacks. (bsc#1016370) Bugs fixed: - Fixed failing 'AuthorizedKeysCommand' within a 'Match User' block in sshd_config (bsc#1105180)

References: https://www.suse.com/support/update/announcement/2018/suse-su-20183540-1/, https://bugzilla.suse.com/1016370, https://bugzilla.suse.com/1065000, https://bugzilla.suse.com/1076957, https://bugzilla.suse.com/1105010, https://bugzilla.suse.com/1105180, https://bugzilla.suse.com/1106163, https://bugzilla.suse.com/1106726, https://www.suse.com/security/cve/CVE-2016-10012, https://www.suse.com/security/cve/CVE-2016-10708, https://www.suse.com/security/cve/CVE-2017-15906, https://www.suse.com/security/cve/CVE-2018-15473