CVE-2018-5732

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Where they are present, operating system mitigation strategies such as address space layout randomization (ASLR) should make it difficult to leverage this vulnerability to achieve remote code execution, but we cannot rule it out as impossible. The safest course is to patch dhclient so that the buffer overflow cannot occur.", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2019-10-09T14:17:14.000Z", "orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://kb.isc.org/docs/aa-01565"}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of DHCP. ISC DHCP releases are available from https://www.isc.org/downloads.\n\n >= DHCP 4.1-ESV-R15-P1\n >= DHCP 4.3.6-P1\n >= DHCP 4.4.1"}], "source": {"discovery": "EXTERNAL"}, "title": "A specially constructed response from a malicious server can cause a buffer overflow in dhclient", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-officer@isc.org", "DATE_PUBLIC": "2018-02-28T00:00:00.000Z", "ID": "CVE-2018-5732", "STATE": "PUBLIC", "TITLE": "A specially constructed response from a malicious server can cause a buffer overflow in dhclient"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "ISC DHCP", "version": {"version_data": [{"version_name": "ISC DHCP", "version_value": "4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0"}]}}]}, "vendor_name": "ISC"}]}}, "credit": [{"lang": "eng", "value": "ISC would like to thank Felix Wilhelm, Google Security Team, for reporting this vulnerability."}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. 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Where they are present, operating system mitigation strategies such as address space layout randomization (ASLR) should make it difficult to leverage this vulnerability to achieve remote code execution, but we cannot rule it out as impossible. The safest course is to patch dhclient so that the buffer overflow cannot occur."}]}]}, "references": {"reference_data": [{"name": "https://kb.isc.org/docs/aa-01565", "refsource": "CONFIRM", "url": "https://kb.isc.org/docs/aa-01565"}]}, "solution": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of DHCP. ISC DHCP releases are available from https://www.isc.org/downloads.\n\n >= DHCP 4.1-ESV-R15-P1\n >= DHCP 4.3.6-P1\n >= DHCP 4.4.1"}], "source": {"discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-05T05:40:51.169Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://kb.isc.org/docs/aa-01565"}]}]}, "cveMetadata": {"assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "assignerShortName": "isc", "cveId": "CVE-2018-5732", "datePublished": "2019-10-09T14:17:14.251Z", "dateReserved": "2018-01-17T00:00:00.000Z", "dateUpdated": "2024-09-16T18:19:36.136Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0"}, {"lang": "es", "value": "Un fallo al comprobar apropiadamente los l\u00edmites de un b\u00fafer usado para procesar las opciones de DHCP, permite a un servidor malicioso (o a una entidad que se hace pasar por un servidor) causar un desbordamiento del b\u00fafer (y el bloqueo resultante) en dhclient mediante el env\u00edo de una respuesta que contiene una secci\u00f3n de opciones especialmente construida. Afecta a ISC DHCP versiones 4.1.0 hasta 4.1-ESV-R15, 4.2.0 hasta 4.2.8, 4.3.0 hasta 4.3.6, y 4.4.0."}], "id": "CVE-2018-5732", "lastModified": "2026-06-17T02:00:40.577", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-10-09T16:15:13.407", "references": [{"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/aa-01565"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/aa-01565"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges Felix Wilhelm (Google) as the original reporter.", "affected_release": [{"advisory": "RHSA-2018:0469", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "dhcp-12:4.1.1-53.P1.el6_9.3", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2018-03-09T00:00:00Z"}, {"advisory": "RHSA-2018:0483", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "dhcp-12:4.2.5-58.el7_4.3", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-03-12T00:00:00Z"}], "bugzilla": {"description": "dhcp: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server", "id": "1549960", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1549960"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-119", "details": ["Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0", "An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet."], "name": "CVE-2018-5732", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2018-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-5732\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-5732\nhttps://kb.isc.org/article/AA-01565"], "threat_severity": "Important"}

{}