cve-2019-10639
Vulnerability from cvelistv5
Published
2019-07-05 22:07
Modified
2024-08-04 22:32
Severity ?
Summary
The Linux kernel 4.x (starting from 4.1) and 5.x before 5.0.8 allows Information Exposure (partial kernel address disclosure), leading to a KASLR bypass. Specifically, it is possible to extract the KASLR kernel image offset using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). This key contains enough bits from a kernel address (of a static variable) so when the key is extracted (via enumeration), the offset of the kernel image is exposed. This attack can be carried out remotely, by the attacker forcing the target device to send UDP or ICMP (or certain other) traffic to attacker-controlled IP addresses. Forcing a server to send UDP traffic is trivial if the server is a DNS server. ICMP traffic is trivial if the server answers ICMP Echo requests (ping). For client targets, if the target visits the attacker's web page, then WebRTC or gQUIC can be used to force UDP traffic to attacker-controlled IP addresses. NOTE: this attack against KASLR became viable in 4.1 because IP ID generation was changed to have a dependency on an address associated with a network namespace.
References
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
cve@mitre.orghttps://arxiv.org/pdf/1906.10478.pdfThird Party Advisory
cve@mitre.orghttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8Mailing List, Release Notes, Vendor Advisory
cve@mitre.orghttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=355b98553789b646ed97ad801a619ff898471b92Mailing List, Patch, Vendor Advisory
cve@mitre.orghttps://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff898471b92Patch, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2019/07/msg00022.html
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
cve@mitre.orghttps://seclists.org/bugtraq/2019/Aug/18
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20190806-0001/
cve@mitre.orghttps://support.f5.com/csp/article/K32804955
cve@mitre.orghttps://support.f5.com/csp/article/K32804955?utm_source=f5support&amp%3Butm_medium=RSS
cve@mitre.orghttps://usn.ubuntu.com/4115-1/
cve@mitre.orghttps://usn.ubuntu.com/4118-1/
cve@mitre.orghttps://www.debian.org/security/2019/dsa-4497
cve@mitre.orghttps://www.oracle.com/security-alerts/cpuApr2021.html
Impacted products
n/an/a
Show details on NVD website

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Espec\u00edficamente, es posible extraer el desplazamiento de la imagen del kernel KASLR utilizando los valores ID de IP que el kernel produce para los protocolos sin conexi\u00f3n (por ejemplo, UDP e ICMP). Cuando dicho tr\u00e1fico se env\u00eda a m\u00faltiples direcciones IP de destino, es posible obtener colisiones de hash (de \u00edndices en la matriz counter) y, por lo tanto, obtener la clave de hashing (mediante enumeraci\u00f3n). Esta clave contiene suficientes bits de una direcci\u00f3n de kernel (de una variable est\u00e1tica) de manera que cuando se extrae la clave (por medio de la enumeraci\u00f3n), queda expuesto el desplazamiento de la imagen del kernel. Este ataque se puede llevar a cabo remotamente, ya que el atacante forza al dispositivo de destino a enviar tr\u00e1fico UDP o ICMP (o algunos otros) hacia direcciones IP controladas por el atacante. Forzar a un servidor a enviar tr\u00e1fico UDP es trivial si el servidor es un servidor DNS. El tr\u00e1fico de ICMP es trivial si el servidor responde a las peticiones de Eco de ICMP (ping). Para los objetivos cliente, si el objetivo visita la p\u00e1gina web del atacante, entonces puede ser usado WebRTC o gQUIC para forzar el tr\u00e1fico UDP hacia las direcciones IP controladas por el atacante. NOTA: este ataque contra KASLR se volvi\u00f3 viable en versi\u00f3n 4.1 porque la generaci\u00f3n de ID de IP fue cambiada para tener una dependencia en una direcci\u00f3n asociada con un espacio de nombre de red.\"}],\"metrics\":{\"cvssMetricV30\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":7.5,\"baseSeverity\":\"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:P/I:N/A:N\",\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":5.0},\"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-326\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.1\",\"versionEndIncluding\":\"4.20.9\",\"matchCriteriaId\":\"ED11DE6F-3BE1-4212-A97A-BB052A591CB2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0\",\"versionEndExcluding\":\"5.0.8\",\"matchCriteriaId\":\"B8C3EB64-4B85-4C0E-B9BD-5342B604A466\"}]}]}],\"references\":[{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://arxiv.org/pdf/1906.10478.pdf\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Release Notes\",\"Vendor Advisory\"]},{\"url\":\"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=355b98553789b646ed97ad801a619ff898471b92\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Patch\",\"Vendor Advisory\"]},{\"url\":\"https://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff898471b92\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://seclists.org/bugtraq/2019/Aug/18\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://security.netapp.com/advisory/ntap-20190806-0001/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://support.f5.com/csp/article/K32804955\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://support.f5.com/csp/article/K32804955?utm_source=f5support\u0026amp%3Butm_medium=RSS\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://usn.ubuntu.com/4115-1/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://usn.ubuntu.com/4118-1/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.debian.org/security/2019/dsa-4497\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.oracle.com/security-alerts/cpuApr2021.html\",\"source\":\"cve@mitre.org\"}]}}"
  }
}


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