cve-2017-1000410
Vulnerability from cvelistv5
Published
2017-12-07 19:00
Modified
2024-08-05 22:00
Severity
Summary
The Linux kernel version 3.3-rc1 and later is affected by a vulnerability lies in the processing of incoming L2CAP commands - ConfigRequest, and ConfigResponse messages. This info leak is a result of uninitialized stack variables that may be returned to an attacker in their uninitialized state. By manipulating the code flows that precede the handling of these configuration messages, an attacker can also gain some control over which data will be held in the uninitialized stack variables. This can allow him to bypass KASLR, and stack canaries protection - as both pointers and stack canaries may be leaked in this manner. Combining this vulnerability (for example) with the previously disclosed RCE vulnerability in L2CAP configuration parsing (CVE-2017-1000251) may allow an attacker to exploit the RCE against kernels which were built with the above mitigations. These are the specifics of this vulnerability: In the function l2cap_parse_conf_rsp and in the function l2cap_parse_conf_req the following variable is declared without initialization: struct l2cap_conf_efs efs; In addition, when parsing input configuration parameters in both of these functions, the switch case for handling EFS elements may skip the memcpy call that will write to the efs variable: ... case L2CAP_CONF_EFS: if (olen == sizeof(efs)) memcpy(&efs, (void *)val, olen); ... The olen in the above if is attacker controlled, and regardless of that if, in both of these functions the efs variable would eventually be added to the outgoing configuration request that is being built: l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), (unsigned long) &efs); So by sending a configuration request, or response, that contains an L2CAP_CONF_EFS element, but with an element length that is not sizeof(efs) - the memcpy to the uninitialized efs variable can be avoided, and the uninitialized variable would be returned to the attacker (16 bytes).
References
SourceURLTags
cve@mitre.orghttp://seclists.org/oss-sec/2017/q4/357Issue Tracking, Mailing List, Patch, Third Party Advisory
cve@mitre.orghttp://www.securityfocus.com/bid/102101Issue Tracking, Third Party Advisory, VDB Entry
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:0654Third Party Advisory
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:0676Third Party Advisory
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:1062Third Party Advisory
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:1130Third Party Advisory
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:1170Third Party Advisory
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2018:1319Third Party Advisory
cve@mitre.orghttps://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3933-1/
cve@mitre.orghttps://usn.ubuntu.com/3933-2/
cve@mitre.orghttps://www.debian.org/security/2017/dsa-4073Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2018/dsa-4082Third Party Advisory
Impacted products
VendorProduct
n/an/a
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Al manipular los flujos de c\u00f3digo que preceden la gesti\u00f3n de estos mensajes de configuraci\u00f3n, un atacante tambi\u00e9n podr\u00eda obtener alg\u00fan tipo de control sobre qu\u00e9 datos se mantendr\u00e1n en las variables de pila sin inicializar. Esto tambi\u00e9n puede permitirle omitir KASLR y la protecci\u00f3n de valores controlados de pila, ya que tanto los punteros como los valores controlados de pila podr\u00edan haberse filtrado de esta forma. La combinaci\u00f3n de esta vulnerabilidad, por ejemplo, con la vulnerabilidad RCE previamente revelada en el an\u00e1lisis sint\u00e1ctico de la configuraci\u00f3n L2CAP (CVE-2017-1000251) podr\u00eda permitir que un atacante explote el RCE contra kernels construidos con las mitigaciones anteriores. Estos son los detalles de esta vulnerabilidad: En las funciones l2cap_parse_conf_rsp y l2cap_parse_conf_req, la siguiente variable se declara sin inicializaci\u00f3n: struct l2cap_conf_efs efs. Adem\u00e1s, al analizar sint\u00e1cticamente los par\u00e1metros de configuraci\u00f3n de entradas en ambas funciones, el switch case para manipular elementos EFS podr\u00eda omitir la llamada memcpy que escribir\u00e1 en la variable efs: ... case L2CAP_CONF_EFS: if (olen == sizeof(efs)) memcpy(efs, (void *)val, olen); ... El olen en el if anterior est\u00e1 controlado por el atacante e, independientemente de ese if, en ambas funciones la variable efs se a\u00f1adir\u00eda finalmente a la petici\u00f3n saliente de configuraci\u00f3n que se est\u00e1 construyendo: l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), (unsigned long) efs). Por lo tanto, al enviar una petici\u00f3n de configuraci\u00f3n o una respuesta que contenga un elemento L2CAP_CONF_EFS, pero con una longitud de elemento que no es sizeof(efs), el memcpy en la variable efs no inicializada puede omitirse y la variable no inicializada se devolver\u00eda al atacante (16 bytes).\"}],\"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-200\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartExcluding\":\"3.2\",\"versionEndExcluding\":\"4.15\",\"matchCriteriaId\":\"0A35EAE4-2910-43D7-BF72-2D76B363D32B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B6EF6556-06A6-4700-B61F-533167096BEF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"69A04496-EA26-42E0-A553-413BF2A78AD7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"14E8986E-B317-40EA-B0B5-5D2922D2AF5B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"EBC4657A-0239-47DF-B582-87D8DFA69439\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"0E1F48A9-9185-4554-9265-22CEC01D18FD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"639D2465-65E0-40E2-B7A8-BEA9E221DE54\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.15:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"A282AD0B-2D63-4F05-8F89-109A0975B423\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BB28F9AF-3D06-4532-B397-96D7E4792503\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"EE249E1B-A1FD-4E08-AA71-A0E1F10FFE97\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"33C068A4-3780-4EAB-A937-6082DF847564\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"9BBCD86A-E6C7-4444-9D74-F861084090F0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"51EF4996-72F4-4FA4-814F-F5991E7A8318\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B353CE99-D57C-465B-AAB0-73EF581127D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"9EC0D196-F7B8-4BDD-9050-779F7A7FBEE4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BF77CDCF-B9C9-427D-B2BF-36650FB2148C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D5F7E11E-FB34-4467-8919-2B6BEAABF665\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B76AA310-FEC7-497F-AF04-C3EC1E76C4CC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E5ED5807-55B7-47C5-97A6-03233F4FBC3A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"825ECE2D-E232-46E0-A047-074B34DB1E97\"}]}]}],\"references\":[{\"url\":\"http://seclists.org/oss-sec/2017/q4/357\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Mailing List\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"http://www.securityfocus.com/bid/102101\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:0654\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:0676\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:1062\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:1130\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:1170\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2018:1319\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://usn.ubuntu.com/3933-1/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://usn.ubuntu.com/3933-2/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.debian.org/security/2017/dsa-4073\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2018/dsa-4082\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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