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{"acknowledgement": "This issue was discovered by Richard W. M. Jones (Red Hat).", "affected_release": [{"advisory": "RHSA-2020:1167", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "nbdkit-0:1.8.0-3.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-03-31T00:00:00Z"}], "bugzilla": {"description": "nbdkit: denial of service due to premature opening of back-end connection", "id": "1757258", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1757258"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-406", "details": ["A denial of service vulnerability was discovered in nbdkit 1.12.7, 1.14.1 and 1.15.1. An attacker could connect to the nbdkit service and cause it to perform a large amount of work in initializing backend plugins, by simply opening a connection to the service. This vulnerability could cause resource consumption and degradation of service in nbdkit, depending on the plugins configured on the server-side.", "A denial of service vulnerability was discovered in nbdkit. An attacker could connect to the nbdkit service and cause it to perform a large amount of work in initializing backend plugins, by simply opening a connection to the service. This vulnerability could cause resource consumption and degradation of service in nbdkit, depending on the plugins configured on the server-side."], "mitigation": {"lang": "en:us", "value": "This attack is only possible if nbdkit is configured with a plugin that does a lot of work in its initial .open() callback. Some examples that do a lot of work are nbdkit-ssh-plugin and nbdkit-guestfs-plugin. The nbdkit-memory-plugin is an example that does very little work, and thus is not subject to this vulnerability.\nOnly attackers that can connect to the nbdkit service can exploit this vulnerability. If nbdkit is not exposed over TCP (eg, nbdkit -U), or is bound only to a private network interface, or is protected by firewall rules, the attack surface is correspondingly limited."}, "name": "CVE-2019-14850", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "nbdkit", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Affected", "package_name": "nbdkit", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Out of support scope", "package_name": "nbdkit", "product_name": "Red Hat Virtualization 4"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Not affected", "package_name": "redhat-virtualization-host", "product_name": "Red Hat Virtualization 4"}], "public_date": "2019-09-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-14850\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-14850\nhttps://www.redhat.com/archives/libguestfs/2019-September/msg00084.html"], "statement": "Red Hat Virtualization Host includes nbdkit as a dependency of libguestfs, and uses it in p2v/v2v migrations. libguestfs uses nbdkit with a Unix domain socket only, so this vulnerability is not exposed to untrusted users.\nRed Hat Virtualization 4.2 EUS includes a vulnerable version of nbdkit, however it is used only on the Hypervisor with a Unix domain socket, so this vulnerability is not exposed to untrusted users.", "threat_severity": "Low", "upstream_fix": "nbdkit 1.12.7, nbdkit 1.14.1, nbdkit 1.15.1"}