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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad de condici\u00f3n de ejecuci\u00f3n del controlador de se\u00f1ales en el servidor de OpenSSH (sshd), donde un cliente no se autentica dentro de los segundos de LoginGraceTime (120 de forma predeterminada, 600 en versiones anteriores de OpenSSH), luego se llama al controlador SIGALRM de sshd de forma asincr\u00f3nica. Sin embargo, este controlador de se\u00f1ales llama a varias funciones que no son seguras para se\u00f1ales as\u00edncronas, por ejemplo, syslog(). Este problema lo deja vulnerable a una condici\u00f3n de ejecuci\u00f3n del controlador de se\u00f1ales en la funci\u00f3n cleanup_exit(), que introduce la misma vulnerabilidad que CVE-2024-6387 en el hijo sin privilegios del servidor SSHD."}], "id": "CVE-2024-6409", "lastModified": "2024-09-12T20:15:05.567", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.7, "source": "secalert@redhat.com", "type": "Secondary"}]}, "published": "2024-07-08T18:15:09.487", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4457"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4613"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4716"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4910"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4955"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:4960"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2024:5444"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2024-6409"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2295085"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-364"}], "source": "secalert@redhat.com", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Solar Designer (CIQ/Rocky Linux) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2024:4457", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "openssh-0:8.7p1-38.el9_4.4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-07-10T00:00:00Z"}, {"advisory": "RHSA-2024:4457", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "openssh-0:8.7p1-38.el9_4.4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-07-10T00:00:00Z"}, {"advisory": "RHSA-2024:4910", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "openssh-0:8.7p1-12.el9_0.3", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2024-07-30T00:00:00Z"}, {"advisory": "RHSA-2024:4716", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "openssh-0:8.7p1-30.el9_2.7", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-07-23T00:00:00Z"}, {"advisory": "RHSA-2024:5444", "cpe": "cpe:/a:redhat:openshift:4.13::el9", "package": "rhcos-413.92.202408122222-0", "product_name": "Red Hat OpenShift Container Platform 4.13", "release_date": "2024-08-22T00:00:00Z"}, {"advisory": "RHSA-2024:4960", "cpe": "cpe:/a:redhat:openshift:4.14::el9", "package": "rhcos-414.92.202407300859-0", "product_name": "Red Hat OpenShift Container Platform 4.14", "release_date": "2024-08-07T00:00:00Z"}, {"advisory": "RHSA-2024:4955", "cpe": "cpe:/a:redhat:openshift:4.15::el9", "package": "rhcos-415.92.202407301159-0", "product_name": "Red Hat OpenShift Container Platform 4.15", "release_date": "2024-08-07T00:00:00Z"}, {"advisory": "RHSA-2024:4613", "cpe": "cpe:/a:redhat:openshift:4.16::el9", "package": "rhcos-416.94.202407171205-0", "product_name": "Red Hat OpenShift Container Platform 4.16", "release_date": "2024-07-24T00:00:00Z"}], "bugzilla": {"description": "openssh: Possible remote code execution due to a race condition in signal handling affecting Red Hat Enterprise Linux 9", "id": "2295085", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2295085"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "verified"}, "cwe": "CWE-364", "details": ["A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.", "A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server."], "mitigation": {"lang": "en:us", "value": "The process is identical to CVE-2024-6387, by disabling LoginGraceTime. See that CVE page for additional details."}, "name": "CVE-2024-6409", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2024-07-08T17:45:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-6409\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-6409"], "statement": "Red Hat rates the severity of this flaw as Moderate for both Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP). While there are many similarities to CVE-2024-6387, the important difference is that any possible remote code execution is limited to an unprivileged child of the SSHD server. This additional restriction on access reduces the overall security impact.\nThis vulnerability only affects the versions of OpenSSH shipped with Red Hat Enterprise Linux 9. Upstream versions of sshd are not impacted by this flaw.\nThe affected versions of OCP are 4.13, 4.14, 4.15, and 4.16 while 4.12 and earlier versions of OCP are not affected.", "threat_severity": "Moderate"}