CVE-2024-6387 (GCVE-0-2024-6387)

Vulnerability from cvelistv5 – Published: 2024-07-01 12:37 – Updated: 2026-09-01 11:07
VLAI
Title
Openssh: regresshion - race condition in ssh allows rce/dos
Summary
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.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-02 13:18 UTC
CWE
  • CWE-364 - Signal Handler Race Condition
References
URL Tags
https://access.redhat.com/errata/RHSA-2024:4312 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4340 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4389 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4469 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4474 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4479 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:4484 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2024-6387 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2294604 issue-trackingx_refsource_REDHAT
https://santandersecurityresearch.github.io/blog/…
https://www.openssh.com/txt/release-9.8
https://www.qualys.com/2024/07/01/cve-2024-6387/r…
https://www.vicarius.io/vsociety/posts/regresshio…
https://www.exploit-db.com/exploits/52269
https://packetstorm.news/files/id/190587/
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/07/02/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/0… x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/03/5 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/04/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/04/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/08/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/08/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/09/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/09/5 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/10/6 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/11/1 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/11/3 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/23/4 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/23/6 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/28/2 x_transferred
http://www.openwall.com/lists/oss-security/2024/07/28/3 x_transferred
https://archlinux.org/news/the-sshd-service-needs… x_transferred
https://arstechnica.com/security/2024/07/regressh… x_transferred
https://blog.qualys.com/vulnerabilities-threat-re… x_transferred
https://explore.alas.aws.amazon.com/CVE-2024-6387.html x_transferred
https://forum.vmssoftware.com/viewtopic.php?f=8&t=9132 x_transferred
https://ftp.netbsd.org/pub/NetBSD/security/adviso… x_transferred
https://github.com/AlmaLinux/updates/issues/629 x_transferred
https://github.com/Azure/AKS/issues/4379 x_transferred
https://github.com/PowerShell/Win32-OpenSSH/discu… x_transferred
https://github.com/PowerShell/Win32-OpenSSH/issues/2249 x_transferred
https://github.com/microsoft/azurelinux/issues/9555 x_transferred
https://github.com/openela-main/openssh/commit/e1… x_transferred
https://github.com/oracle/oracle-linux/issues/149 x_transferred
https://github.com/rapier1/hpn-ssh/issues/87 x_transferred
https://github.com/zgzhang/cve-2024-6387-poc x_transferred
https://lists.almalinux.org/archives/list/announc… x_transferred
https://lists.mindrot.org/pipermail/openssh-unix-… x_transferred
https://lists.mindrot.org/pipermail/openssh-unix-… x_transferred
https://news.ycombinator.com/item?id=40843778 x_transferred
https://psirt.global.sonicwall.com/vuln-detail/SN… x_transferred
https://security-tracker.debian.org/tracker/CVE-2… x_transferred
https://security.netapp.com/advisory/ntap-2024070… x_transferred
https://sig-security.rocky.page/issues/CVE-2024-6387/ x_transferred
https://stackdiary.com/openssh-race-condition-in-… x_transferred
https://ubuntu.com/security/CVE-2024-6387 x_transferred
https://ubuntu.com/security/notices/USN-6859-1 x_transferred
https://www.akamai.com/blog/security-research/202… x_transferred
https://www.arista.com/en/support/advisories-noti… x_transferred
https://www.freebsd.org/security/advisories/FreeB… x_transferred
https://www.splunk.com/en_us/blog/security/cve-20… x_transferred
https://www.suse.com/security/cve/CVE-2024-6387.html x_transferred
https://www.theregister.com/2024/07/01/regresshio… x_transferred
https://support.apple.com/kb/HT214119 x_transferred
https://support.apple.com/kb/HT214118 x_transferred
https://support.apple.com/kb/HT214120 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/20 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/18 x_transferred
http://seclists.org/fulldisclosure/2024/Jul/19 x_transferred
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
Impacted products
Vendor Product Version
Affected: 8.5p1 , ≤ 9.7p1 (custom)
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 0:8.7p1-12.el9_0.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0::appstream
    cpe:/o:redhat:rhel_e4s:9.0::baseos
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Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support Unaffected: 0:8.7p1-30.el9_2.4 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.2::appstream
    cpe:/o:redhat:rhel_eus:9.2::baseos
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Red Hat Red Hat OpenShift Container Platform 4.13 Unaffected: 413.92.202407091321-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.13::el8
    cpe:/a:redhat:openshift:4.13::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.14 Unaffected: 414.92.202407091253-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.14::el8
    cpe:/a:redhat:openshift:4.14::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.15 Unaffected: 415.92.202407091355-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.15::el8
    cpe:/a:redhat:openshift:4.15::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 416.94.202407081958-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat Ceph Storage 5     cpe:/a:redhat:ceph_storage:5
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Red Hat Red Hat Ceph Storage 6     cpe:/a:redhat:ceph_storage:6
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Red Hat Red Hat Ceph Storage 7     cpe:/a:redhat:ceph_storage:7
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Siemens Industrial Edge Management OS (IEM-OS) Affected: 0 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SINAMICS IIoT module Affected: 0 , < V1.0 HF1 (custom)
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Siemens SINEMA Remote Connect Server Affected: 0 , < V3.2 SP2 (custom)
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Siemens SINUMERIK ONE Affected: 0 , < V6.24 (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Date Public
2024-07-01 08:00
Show details on NVD website

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                "cpe:/a:redhat:openshift:4"
              ],
              "defaultStatus": "affected",
              "packageName": "openshift/ose-rhel-coreos-8",
              "product": "Red Hat OpenShift Container Platform 4",
              "vendor": "Red Hat"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "Red Hat would like to thank Qualys Threat Research Unit (TRU) (Qualys) for reporting this issue."
            }
          ],
          "datePublic": "2024-07-01T08:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "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."
            }
          ],
          "metrics": [
            {
              "other": {
                "content": {
                  "namespace": "https://access.redhat.com/security/updates/classification/",
                  "value": "Important"
                },
                "type": "Red Hat severity rating"
              }
            },
            {
              "cvssV3_1": {
                "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",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-01T11:07:10.385Z",
            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
            "shortName": "redhat"
          },
          "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"
            },
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2024-6387"
            },
            {
              "name": "RHBZ#2294604",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "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"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2024-06-27T00:00:00.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2024-07-01T08:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Openssh: regresshion - race condition in ssh allows rce/dos",
          "workarounds": [
            {
              "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."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-364: Signal Handler Race Condition"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2024-6387",
        "datePublished": "2024-07-01T12:37:25.431Z",
        "dateReserved": "2024-06-27T13:41:03.421Z",
        "dateUpdated": "2026-09-01T11:07:10.385Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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