{"containers": {"cna": {"title": "IP-in-IP protocol allows a remote, unauthenticated attacker to route arbitrary network traffic", "descriptions": [{"lang": "en", "value": "IP-in-IP protocol specifies IP Encapsulation within IP standard (RFC 2003, STD 1) that decapsulate and route IP-in-IP traffic is vulnerable to spoofing, access-control bypass and other unexpected behavior due to the lack of validation to verify network packets before decapsulation and routing."}], "affected": [{"vendor": "IETF", "product": "RFC2003 - IP Encapsulation within IP", "versions": [{"version": "STD 1", "status": "affected"}]}], "references": [{"url": "https://kb.cert.org/vuls/id/636397/", "name": "VU#636397"}, {"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4"}, {"url": "https://www.digi.com/resources/security"}, {"url": "https://www.kb.cert.org/vuls/id/636397", "name": "VU#636397"}, {"url": "https://datatracker.ietf.org/doc/html/rfc6169", "name": "Security Concerns with IP Tunneling"}], "credits": [{"lang": "en", "value": "Thanks to Yannay Livneh for reporting this issue."}], "datePublic": "2020-06-01T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing", "lang": "en", "type": "CWE"}]}], "solutions": [{"lang": "en", "value": "Customers should apply the latest patch provided by the affected vendor that addresses this issue and prevents unspecified IP-in-IP packets from being processed. Devices manufacturers are urged to disable IP-in-IP in their default configuration and require their customers to explicitly configure IP-in-IP as and when needed."}], "source": {"discovery": "EXTERNAL"}, "workarounds": [{"lang": "en", "value": "Users can block IP-in-IP packets by filtering IP protocol number 4. Note this filtering is for the IPv4 Protocol (or IPv6 Next Header) field value of 4 and not IP protocol version 4 (IPv4)."}], "providerMetadata": {"orgId": "37e5125f-f79b-445b-8fad-9564f167944b", "shortName": "certcc", "dateUpdated": "2024-06-17T21:10:04.191Z"}, "x_generator": {"engine": "cveClient/1.0.15"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://kb.cert.org/vuls/id/636397/", "name": "VU#636397", "tags": ["x_transferred"]}, {"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4", "tags": ["x_transferred"]}, {"url": "https://www.digi.com/resources/security", "tags": ["x_transferred"]}, {"url": "https://www.kb.cert.org/vuls/id/636397", "name": "VU#636397", "tags": ["x_transferred"]}, {"url": "https://datatracker.ietf.org/doc/html/rfc6169", "name": "Security Concerns with IP Tunneling", "tags": ["x_transferred"]}, {"url": "https://www.kb.cert.org/vuls/id/199397"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:33:32.981Z"}}]}, "cveMetadata": {"assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b", "assignerShortName": "certcc", "cveId": "CVE-2020-10136", "datePublished": "2020-06-02T08:35:12.921Z", "dateReserved": "2020-03-05T00:00:00.000Z", "dateUpdated": "2025-11-03T20:33:32.981Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.2"}

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red."}], "id": "CVE-2020-10136", "lastModified": "2025-11-03T21:15:39.860", "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}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-06-02T09:15:09.967", "references": [{"source": "cret@cert.org", "url": "https://datatracker.ietf.org/doc/html/rfc6169"}, {"source": "cret@cert.org", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://kb.cert.org/vuls/id/636397/"}, {"source": "cret@cert.org", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4"}, {"source": "cret@cert.org", "tags": ["Third Party Advisory"], "url": "https://www.digi.com/resources/security"}, {"source": "cret@cert.org", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://www.kb.cert.org/vuls/id/636397"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://datatracker.ietf.org/doc/html/rfc6169"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://kb.cert.org/vuls/id/636397/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.digi.com/resources/security"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/199397"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "US Government Resource"], "url": "https://www.kb.cert.org/vuls/id/636397"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "cret@cert.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-290"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: IP-in-IP protocol routes arbitrary traffic by default", "id": "1829625", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1829625"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-284->CWE-200", "details": ["IP-in-IP protocol specifies IP Encapsulation within IP standard (RFC 2003, STD 1) that decapsulate and route IP-in-IP traffic is vulnerable to spoofing, access-control bypass and other unexpected behavior due to the lack of validation to verify network packets before decapsulation and routing.", "A flaw was found in the IP-in-IP protocol. An unauthenticated attacker can use the IP-in-IP protocol to route network traffic through a vulnerable device, which can lead to spoofing, access control bypasses, and other unexpected network behaviors."], "mitigation": {"lang": "en:us", "value": "Systems that have IP in IP kernel modules loaded will need to unload the \"ipip\" kernel module and blacklist it to prevent the module from being used a fix has been provided ( See https://access.redhat.com/solutions/41278 for a guide on how to blacklist modules). \nTake careful consideration that if unloading and blacklisting the module, this may create a one-time attack vector window for a local attacker.\nConsider using an alternative authenticated and encrypted tunnelling protocol until a suitable solution is developed."}, "name": "CVE-2020-10136", "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": "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-alt", "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:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-06-09T14:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-10136\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-10136\nhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/security_guide/sec-securing_virtual_private_networks\nhttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/security_guide/sec-setting_and_controlling_ip_sets_using_iptables"], "statement": "The IP-in-IP encapsulation is 'in the clear' tunnel protocol between two hosts. When the module is loaded, the system will be in an 'any-to-any' routing state. It will accept any \"IP in IP\" packets and forward them through the system routing chains.\nNo authentication, encryption or restrictions is created between endpoints by the kernel module. Until a configuration rule is set, any system that can send \"IP in IP\" packets to an unconfigured system with the ipip kernel module loaded will be unwrapped and forwarded. There is an area of opportunity between module loading and configuration that may allow for an attacker to abuse this flaw. \nWhen a tunnel device is created this will restrict the source and destination of the tunnelled packets. The content of the tunnelled data remains unencrypted and unauthenticated.\nRed Hat Product Security strongly recommends using authenticated and encrypted tunnels such as IPSec, VPN or libreswan if tunnelling between networks is required.", "threat_severity": "Moderate"}