CVE-2020-25645

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Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en el kernel de Linux en versiones anteriores a 5.9-rc7. El tr\u00e1fico entre dos endpoints Geneve puede no estar cifrado cuando IPsec est\u00e1 configurado para cifrar el tr\u00e1fico para el puerto UDP espec\u00edfico usado por el t\u00fanel GENEVE, permitiendo a cualquier persona entre los dos endpoints leer el tr\u00e1fico sin cifrar. La principal amenaza de esta vulnerabilidad es la confidencialidad de los datos"}], "id": "CVE-2020-25645", "lastModified": "2026-06-17T03:07:02.407", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-10-13T20:15:12.570", "references": [{"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1883988"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html"}, {"source": "secalert@redhat.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20201103-0004/"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2020/dsa-4774"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1883988"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20201103-0004/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2020/dsa-4774"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-319"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-319"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "This issue was discovered by Mark Gray (Red Hat) and Sabrina Dubroca (Red Hat).", "affected_release": [{"advisory": "RHSA-2021:0857", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-1160.21.1.rt56.1158.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-03-16T00:00:00Z"}, {"advisory": "RHSA-2021:0856", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-1160.21.1.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-03-16T00:00:00Z"}], "bugzilla": {"description": "kernel: Geneve/IPsec traffic may be unencrypted between two Geneve endpoints", "id": "1883988", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1883988"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-319", "details": ["A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.", "A flaw was found in the Linux kernel. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality."], "mitigation": {"lang": "en:us", "value": "A possible workaround for this flaw is to configure IPsec for all traffic between the endpoints, instead of specifically for the UDP port used by the GENEVE tunnels. If GENEVE tunnels are not used, this flaw will not be triggered. In that case, it is possible to disable those tunnels, by unloading the \"geneve\" kernel module and blacklisting it (See https://access.redhat.com/solutions/41278 for a\nguide on how to blacklist modules)."}, "name": "CVE-2020-25645", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-25645\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25645"], "threat_severity": "Moderate"}

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