CVE-2018-14633

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An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable."}, {"lang": "es", "value": "Se ha detectado un error de seguridad en la funci\u00f3n chap_server_compute_md5() en el c\u00f3digo ISCSI objetivo en el kernel de Linux, por la forma en la que se procesa una petici\u00f3n de autenticaci\u00f3n de un iniciador ISCSI. Un atacante remoto no autenticado puede provocar un desbordamiento de b\u00fafer basado en pila y quebrar hasta 17 bytes de la pila. El ataque requiere que el iSCSI objetivo est\u00e9 habilitado en el host de la v\u00edctima. Dependiendo de c\u00f3mo se haya construido el c\u00f3digo del objetivo (dependiendo de un compilador, marcas de compilaci\u00f3n o arquitectura del hardware), un ataque podr\u00eda conducir a un cierre inesperado del sistema y, por lo tanto, a una denegaci\u00f3n de servicio (DoS) o, posiblemente, a un acceso no autorizado a los datos exportados por un objetivo iSCSI. Debido a la naturaleza del error, no se puede descartar totalmente un escalado de privilegios, aunque se cree que es altamente improbable. Se cree que las versiones 4.18.x, 4.14.x y 3.10.x del kernel se han visto afectadas."}], "id": "CVE-2018-14633", "lastModified": "2026-06-17T01:41:20.223", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 8.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:C", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 8.5, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", 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"url": "https://usn.ubuntu.com/3775-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3776-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3776-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3777-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3777-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3777-3/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3779-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2018/dsa-4308"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Vincent Pelletier for reporting this issue.", "affected_release": [{"advisory": "RHSA-2018:3666", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-957.1.3.rt56.913.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-11-27T00:00:00Z"}, {"advisory": "RHSA-2018:3651", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-957.1.3.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-11-27T00:00:00Z"}, {"advisory": "RHSA-2019:1946", "cpe": "cpe:/o:redhat:rhel_eus:7.4", "package": "kernel-0:3.10.0-693.55.1.el7", "product_name": "Red Hat Enterprise Linux 7.4 Extended Update Support", "release_date": "2019-07-30T00:00:00Z"}], "bugzilla": {"description": "kernel: stack-based buffer overflow in chap_server_compute_md5() in iscsi target", "id": "1626035", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1626035"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.", "A flaw was found in the ISCSI target code in the Linux kernel. The flaw allows an unauthenticated, remote attacker to cause a stack buffer overflow of 17 bytes of the stack. Depending on how the kernel was compiled (e.g. compiler, compile flags, and hardware architecture), the attack may lead to a system crash or access to data exported by an iSCSI target. Privilege escalation cannot be ruled out. The highest threat from this vulnerability is to system availability."], "name": "CVE-2018-14633", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2018-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-14633\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-14633"], "threat_severity": "Moderate"}

{}