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{"bugzilla": {"description": "openssh: User enumeration via malformed packets in authentication requests", "id": "1623184", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1623184"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-200", "details": ["Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or \"oracle\") as a vulnerability.'", "A vulnerability was found in OpenSSH Server, where failed GSSAPI authentication attempts elicit different responses depending on whether the target username exists, a remote attacker could exploit this behavior to enumerate valid usernames on a system, potentially aiding in further attacks. This issue could be leveraged in reconnaissance efforts to identify existing user accounts."], "mitigation": {"lang": "en:us", "value": "If GSSAPI Authentication is not required, this flaw can be mitigated by changing the global configuration in `/etc/ssh/sshd_config` from `GSSAPIAuthentication yes` to `GSSAPIAuthentication no`."}, "name": "CVE-2018-15919", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Will not fix", "package_name": "openssh", "product_name": "Red Hat Virtualization 4"}], "public_date": "2018-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-15919\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-15919"], "statement": "This vulnerability is rated as moderate because OpenSSH Server responds differently to failed GSSAPI authentication attempts based on whether a target username exists, while this does not directly compromise system integrity, it could facilitate further attacks such as brute-force or credential-stuffing attempts.", "threat_severity": "Moderate"}