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          "value": "A security regression (CVE-2006-5051) was discovered in OpenSSH\u0027s 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."
        }
      ],
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            "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"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-364",
              "description": "Signal Handler Race Condition",
              "lang": "en",
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          ]
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      "references": [
        {
          "name": "RHSA-2024:4312",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4312"
        },
        {
          "name": "RHSA-2024:4340",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4340"
        },
        {
          "name": "RHSA-2024:4389",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4389"
        },
        {
          "name": "RHSA-2024:4469",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4469"
        },
        {
          "name": "RHSA-2024:4474",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4474"
        },
        {
          "name": "RHSA-2024:4479",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4479"
        },
        {
          "name": "RHSA-2024:4484",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2024:4484"
        },
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            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2024-6387"
        },
        {
          "name": "RHBZ#2294604",
          "tags": [
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294604"
        },
        {
          "url": "https://santandersecurityresearch.github.io/blog/sshing_the_masses.html"
        },
        {
          "url": "https://www.openssh.com/txt/release-9.8"
        },
        {
          "url": "https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt"
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          "value": "Reported to Red Hat."
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          "lang": "en",
          "time": "2024-07-01T08:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Openssh: regresshion - race condition in ssh allows rce/dos",
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          "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\u0027s 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 \u0027fail2ban\u0027 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."
        }
      ],
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      },
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    "datePublished": "2024-07-01T12:37:25.431Z",
    "dateReserved": "2024-06-27T13:41:03.421Z",
    "dateUpdated": "2025-12-11T06:17:03.387Z",
    "state": "PUBLISHED"
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}