CVE-2021-21257

{"id": "CVE-2021-21257", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.2, "exploitabilityScore": 3.9}]}, "published": "2021-06-18T21:15:07.583", "references": [{"url": "https://github.com/contiki-ng/contiki-ng/pull/1431", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mvc7-9p4q-c5cm", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "Contiki-NG is an open-source, cross-platform operating system for internet of things devices. The RPL-Classic and RPL-Lite implementations in the Contiki-NG operating system versions prior to 4.6 do not validate the address pointer in the RPL source routing header This makes it possible for an attacker to cause out-of-bounds writes with packets injected into the network stack. Specifically, the problem lies in the rpl_ext_header_srh_update function in the two rpl-ext-header.c modules for RPL-Classic and RPL-Lite respectively. The addr_ptr variable is calculated using an unvalidated CMPR field value from the source routing header. An out-of-bounds write can be triggered on line 151 in os/net/routing/rpl-lite/rpl-ext-header.c and line 261 in os/net/routing/rpl-classic/rpl-ext-header.c, which contain the following memcpy call with addr_ptr as destination. The problem has been patched in Contiki-NG 4.6. Users can apply a patch out-of-band as a workaround."}, {"lang": "es", "value": "Contiki-NG es un sistema operativo de c\u00f3digo abierto y multiplataforma para dispositivos del Internet de las cosas. Las implementaciones de RPL-Classic y RPL-Lite en el sistema operativo Contiki-NG versiones anteriores a 4.6, no comprueban el puntero de direcci\u00f3n en el encabezado de enrutamiento de origen de RPL, esto hace posible a un atacante causar escrituras fuera de l\u00edmites con paquetes inyectados en la pila de red. Espec\u00edficamente, el problema radica en la funci\u00f3n rpl_ext_header_srh_update de los dos m\u00f3dulos del archivo rpl-ext-header.c para RPL-Classic y RPL-Lite respectivamente. La variable addr_ptr se calcula usando un valor de campo CMPR no comprobado del encabezado de enrutamiento de origen. Una escritura fuera de l\u00edmites puede ser desencadenada en la l\u00ednea 151 en el archivo os/net/routing/rpl-lite/rpl-ext-header.c y en la l\u00ednea 261 en el archivo os/net/routing/rpl-classic/rpl-ext-header.c, que contienen la siguiente llamada memcpy con la funci\u00f3n addr_ptr como destino. El problema ha sido parcheado en Contiki-NG versi\u00f3n 4.6. Unos usuarios pueden aplicar un parche fuera de l\u00edmite como soluci\u00f3n alternativa"}], "lastModified": "2021-06-24T19:35:00.607", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5A252509-8FE0-4C3D-9628-2041425B3F05", "versionEndExcluding": "4.6"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}