{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-34319", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2023-06-01T10:44:17.064Z", "datePublished": "2023-09-22T13:34:44.424Z", "dateUpdated": "2025-02-13T16:55:26.997Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "product": "Linux", "vendor": "Linux", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-432"}]}], "configurations": [{"lang": "en", "value": "All systems using a Linux based network backend with kernel 3.19 and\nnewer are vulnerable, on the assumption that the fix for XSA-423 was\ntaken. Systems using other network backends are not known to be\nvulnerable."}], "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered by Ross Lagerwall of Citrix."}], "datePublic": "2023-09-19T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "The fix for XSA-423 added logic to Linux'es netback driver to deal with\na frontend splitting a packet in a way such that not all of the headers\nwould come in one piece. Unfortunately the logic introduced there\ndidn't account for the extreme case of the entire packet being split\ninto as many pieces as permitted by the protocol, yet still being\nsmaller than the area that's specially dealt with to keep all (possible)\nheaders together. Such an unusual packet would therefore trigger a\nbuffer overrun in the driver."}], "impacts": [{"descriptions": [{"lang": "en", "value": "An unprivileged guest can cause Denial of Service (DoS) of the host by sending network packets to the backend, causing the backend to crash. Data corruption or privilege escalation seem unlikely but have not been ruled out."}]}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2024-02-02T14:06:14.314Z"}, "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-432.html"}, {"url": "http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html"}, {"url": "https://security.netapp.com/advisory/ntap-20240202-0001/"}], "title": "Linux: buffer overrun in netback due to unusual packet", "workarounds": [{"lang": "en", "value": "Using another PV network backend (e.g. the qemu based \"qnic\" backend)\nwill mitigate the problem.\n\nUsing a dedicated network driver domain per guest will mitigate the\nproblem."}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T16:10:06.547Z"}, "title": "CVE Program Container", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-432.html", "tags": ["x_transferred"]}, {"url": "http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20240202-0001/", "tags": ["x_transferred"]}]}]}}

{}

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Unfortunately the logic introduced there\ndidn't account for the extreme case of the entire packet being split\ninto as many pieces as permitted by the protocol, yet still being\nsmaller than the area that's specially dealt with to keep all (possible)\nheaders together. Such an unusual packet would therefore trigger a\nbuffer overrun in the driver."}, {"lang": "es", "value": "La soluci\u00f3n para XSA-423 agreg\u00f3 l\u00f3gica al controlador netback de Linux para lidiar con una interfaz que divide un paquete de tal manera que no todos los encabezados vengan en una sola pieza. Desafortunadamente, la l\u00f3gica introducida all\u00ed no tuvo en cuenta el caso extremo de que todo el paquete se divida en tantas partes como lo permita el protocolo, pero a\u00fan as\u00ed sea m\u00e1s peque\u00f1o que el \u00e1rea que se trata especialmente para mantener todos los (posibles) encabezados juntos. Por lo tanto, un paquete tan inusual provocar\u00eda un Desbordamiento del B\u00fafer en el controlador."}], "id": "CVE-2023-34319", "lastModified": "2025-02-13T17:16:35.453", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2023-09-22T14:15:45.627", "references": [{"source": "security@xen.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html"}, {"source": "security@xen.org", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html"}, {"source": "security@xen.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20240202-0001/"}, {"source": "security@xen.org", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-432.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20240202-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-432.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "xen: buffer overrun in netback due to unusual packet (XSA-432)", "id": "2230156", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2230156"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-119", "details": ["The fix for XSA-423 added logic to Linux'es netback driver to deal with\na frontend splitting a packet in a way such that not all of the headers\nwould come in one piece. Unfortunately the logic introduced there\ndidn't account for the extreme case of the entire packet being split\ninto as many pieces as permitted by the protocol, yet still being\nsmaller than the area that's specially dealt with to keep all (possible)\nheaders together. Such an unusual packet would therefore trigger a\nbuffer overrun in the driver.", "A buffer overrun vulnerability was found in the netback driver in Xen due to an unusual split packet. This flaw allows an unprivileged guest to cause a denial of service (DoS) of the host by sending network packets to the backend, causing the backend to crash."], "name": "CVE-2023-34319", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "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:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2023-08-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-34319\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-34319\nhttp://xenbits.xen.org/xsa/advisory-432.html"], "threat_severity": "Moderate"}