{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/vex/2018/cve-2018-7544-els_os-ubuntu16_04els.json" } ], "tracking": { "current_release_date": "2026-04-24T11:49:23Z", "generator": { "date": "2026-04-24T11:49:23Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2018-7544-ELS_OS-UBUNTU16.04ELS", "initial_release_date": "2018-03-16T15:29:00Z", "revision_history": [ { "date": "2018-03-16T15:29:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-20T15:28:27Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-04-24T11:49:23Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2018-7544" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 16.04", "product": { "name": "Ubuntu 16.04", "product_id": "Ubuntu-16", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64", "product": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64", "product_id": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/openvpn@2.3.10-1ubuntu2.2%2Btuxcare.els3?arch=amd64" } } }, { "category": "product_version", "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "product": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "product_id": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/openvpn@2.3.10-1ubuntu2.2%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "product": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "product_id": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/openvpn@2.3.10-1ubuntu2.2%2Btuxcare.els2?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64" }, "product_reference": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64" }, "product_reference": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64" }, "product_reference": "openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" } ] }, "vulnerabilities": [ { "cve": "CVE-2018-7544", "cwe": { "id": "CWE-134", "name": "Use of Externally-Controlled Format String" }, "notes": [ { "category": "description", "text": "A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5. When this interface is enabled over TCP without a password, and when no other clients are connected to this interface, attackers can execute arbitrary management commands, obtain sensitive information, or cause a denial of service (SIGTERM) by triggering XMLHttpRequest actions in a web browser. This is demonstrated by a multipart/form-data POST to http://localhost:23000 with a \"signal SIGTERM\" command in a TEXTAREA element. NOTE: The vendor disputes that this is a vulnerability. They state that this is the result of improper configuration of the OpenVPN instance rather than an intrinsic vulnerability, and now more explicitly warn against such configurations in both the management-interface documentation, and with a runtime warning", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2018-7544" }, { "category": "external", "summary": "http://blog.0xlabs.com/2018/03/openvpn-remote-information-disclosure.html", "url": "http://blog.0xlabs.com/2018/03/openvpn-remote-information-disclosure.html" } ], "release_date": "2018-03-16T15:29:00Z", "scores": [ { "cvss_v2": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P", "version": "2.0" }, "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.0" }, "products": [ "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64" ] } ], "threats": [ { "category": "impact", "details": "Critical" }, { "category": "impact", "details": "critical", "product_ids": [ "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els1.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els2.amd64", "Ubuntu-16:openvpn-0:2.3.10-1ubuntu2.2+tuxcare.els3.amd64" ] } ] } ] }