CVE-2020-17469 (GCVE-0-2020-17469)
Vulnerability from cvelistv5
Published
2020-12-11 22:39
Modified
2024-08-04 13:53
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
An issue was discovered in FNET through 4.6.4. The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn't have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.
References
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The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn\u0027t have a reference to the previous one (which supposedly resides in the reassembly list). 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The code for IPv6 fragment reassembly tries to access a previous fragment starting from a network incoming fragment that still doesn\u0027t have a reference to the previous one (which supposedly resides in the reassembly list). When faced with an incoming fragment that belongs to a non-empty fragment list, IPv6 reassembly must check that there are no empty holes between the fragments: this leads to an uninitialized pointer dereference in _fnet_ip6_reassembly in fnet_ip6.c, and causes Denial-of-Service.\"},{\"lang\":\"es\",\"value\":\"Se detect\u00f3 un problema en FNET versiones hasta 4.6.4.\u0026#xa0;El c\u00f3digo para el reensamblaje de fragmentos IPv6 intenta acceder a un fragmento anterior a partir de un fragmento entrante de red que a\u00fan no cuenta con una referencia al anterior (que supuestamente reside en la lista de reensamblado).\u0026#xa0;Cuando se enfrenta a un fragmento entrante que pertenece a una lista de fragmentos no vac\u00edos, el reensamblaje de IPv6 debe comprobar que no haya huecos vac\u00edos entre los fragmentos: esto conlleva a una desreferencia del puntero no inicializado en la funci\u00f3n _fnet_ip6_reassembly en el archivo fnet_ip6.c, y causa una Denegaci\u00f3n de Servicio\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:N/A:P\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-824\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:butok:fnet:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"4.6.4\",\"matchCriteriaId\":\"F8E2831C-6C9A-4130-8993-2E5DF9F8F6F3\"}]}]}],\"references\":[{\"url\":\"http://fnet.sourceforge.net/manual/fnet_history.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"https://www.kb.cert.org/vuls/id/815128\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"http://fnet.sourceforge.net/manual/fnet_history.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"https://www.kb.cert.org/vuls/id/815128\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]}]}}" } }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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