{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2024-6387", "ASSIGNER": "secalert@redhat.com", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "Signal Handler Race Condition", "cweId": "CWE-364" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Red Hat", "product": { "product_data": [ { "product_name": "Red Hat Enterprise Linux 9", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "0:8.7p1-38.el9_4.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "0:8.7p1-38.el9_4.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "0:8.7p1-12.el9_0.1", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "0:8.7p1-30.el9_2.4", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat OpenShift Container Platform 4.13", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "413.92.202407091321-0", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat OpenShift Container Platform 4.14", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "414.92.202407091253-0", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat OpenShift Container Platform 4.15", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "415.92.202407091355-0", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat OpenShift Container Platform 4.16", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "416.94.202407081958-0", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat Ceph Storage 5", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "unaffected" } } ] } }, { "product_name": "Red Hat Ceph Storage 6", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat Ceph Storage 7", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "affected" } } ] } }, { "product_name": "Red Hat Enterprise Linux 6", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "unaffected" } } ] } }, { "product_name": "Red Hat Enterprise Linux 7", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "unaffected" } } ] } }, { "product_name": "Red Hat Enterprise Linux 8", "version": { "version_data": [ { "version_value": "not down converted", "x_cve_json_5_version_data": { "defaultStatus": "unaffected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://access.redhat.com/errata/RHSA-2024:4312", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4312" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4340", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4340" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4389", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4389" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4469", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4469" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4474", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4474" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4479", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4479" }, { "url": "https://access.redhat.com/errata/RHSA-2024:4484", "refsource": "MISC", "name": "https://access.redhat.com/errata/RHSA-2024:4484" }, { "url": "https://access.redhat.com/security/cve/CVE-2024-6387", "refsource": "MISC", "name": "https://access.redhat.com/security/cve/CVE-2024-6387" }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294604", "refsource": "MISC", "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2294604" }, { "url": "https://santandersecurityresearch.github.io/blog/sshing_the_masses.html", "refsource": "MISC", "name": "https://santandersecurityresearch.github.io/blog/sshing_the_masses.html" }, { "url": "https://www.openssh.com/txt/release-9.8", "refsource": "MISC", "name": "https://www.openssh.com/txt/release-9.8" }, { "url": "https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt", "refsource": "MISC", "name": "https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt" } ] }, "work_around": [ { "lang": "en", "value": "The below process can protect against a Remote Code Execution attack by disabling the LoginGraceTime parameter on Red Hat Enterprise Linux 9. However, the sshd server is still vulnerable to a Denial of Service if an attacker exhausts all the connections.\n\n1) As root user, open the /etc/ssh/sshd_config\n2) Add or edit the parameter configuration:\n~~~\nLoginGraceTime 0\n~~~\n3) Save and close the file\n4) Restart the sshd daemon:\n~~~\nsystemctl restart sshd.service\n~~~\n\nSetting LoginGraceTime to 0 disables the SSHD server's ability to drop connections if authentication is not completed within the specified timeout. If this mitigation is implemented, it is highly recommended to use a tool like 'fail2ban' alongside a firewall to monitor log files and manage connections appropriately.\n\nIf any of the mitigations mentioned above is used, please note that the removal of LoginGraceTime parameter from sshd_config is not automatic when the updated package is installed." } ], "credits": [ { "lang": "en", "value": "Red Hat would like to thank Qualys Threat Research Unit (TRU) (Qualys) for reporting this issue." } ], "impact": { "cvss": [ { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" } ] } }