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

Vulnerability from cvelistv5 – Published: 2024-07-01 12:37 – Updated: 2025-12-11 06:17
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.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-364 - Signal Handler Race Condition
Assigner
References
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 Unaffected: 0:8.7p1-38.el9_4.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
    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
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support Unaffected: 0:8.7p1-30.el9_2.4 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.2::baseos
    cpe:/a:redhat:rhel_eus:9.2::appstream
 Create a notification for this product.
    Red Hat Red Hat OpenShift Container Platform 4.13 Unaffected: 413.92.202407091321-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.13::el9
    cpe:/a:redhat:openshift:4.13::el8
 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
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 5     cpe:/a:redhat:ceph_storage:5
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 6     cpe:/a:redhat:ceph_storage:6
 Create a notification for this product.
    Red Hat Red Hat Ceph Storage 7     cpe:/a:redhat:ceph_storage:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
    Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Credits
Red Hat would like to thank Qualys Threat Research Unit (TRU) (Qualys) for reporting this issue.
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\"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:8\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 8\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2024-06-27T00:00:00+00:00\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2024-07-01T08:00:00+00:00\", \"value\": \"Made public.\"}], \"datePublic\": \"2024-07-01T08:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2024:4312\", \"name\": \"RHSA-2024:4312\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4340\", \"name\": \"RHSA-2024:4340\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4389\", \"name\": \"RHSA-2024:4389\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4469\", \"name\": \"RHSA-2024:4469\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4474\", \"name\": \"RHSA-2024:4474\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4479\", \"name\": \"RHSA-2024:4479\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:4484\", \"name\": \"RHSA-2024:4484\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2024-6387\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2294604\", \"name\": \"RHBZ#2294604\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"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\"}], \"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\"}, \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-364\", \"description\": \"Signal Handler Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-12-11T06:17:03.387Z\"}, \"x_redhatCweChain\": \"CWE-364: Signal Handler Race Condition\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-6387\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-11T06:17:03.387Z\", \"dateReserved\": \"2024-06-27T13:41:03.421Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2024-07-01T12:37:25.431Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.