rhsa-2019_3941
Vulnerability from csaf_redhat
Published
2019-11-21 09:55
Modified
2024-09-16 02:35
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.1.24 machine-os-content-container security update
Notes
Topic
Red Hat OpenShift Container Platform release 4.1.24 is now available with updates to packages and images that fix several bugs and add enhancements.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.
This is a text-only advisory for the machine-os-content container image, which includes RPM packages for Red Hat Enterprise Linux CoreOS.
Security Fix(es):
* A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU's local cache and system software's Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor.
System software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory. Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor's Memory Management Unit (MMU) uses Paging structure entries to translate program's virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and other for data addresses.
System software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor's TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change. (CVE-2018-12207)
* A flaw was found in the way sudo implemented running commands with an arbitrary user ID. If a sudoers entry is written to allow users to run a command as any user except root, this flaw can be used by an attacker to bypass that restriction. (CVE-2019-14287)
* An improper authorization flaw was discovered in systemd-resolved in the way it configures the exposed DBus interface org.freedesktop.resolve1. An unprivileged local user could call all DBus methods, even when marked as privileged operations. An attacker could abuse this flaw by changing the DNS, Search Domain, LLMNR, DNSSEC, and other network link settings without any authorization, giving them control of the network names resolution process and causing the system to communicate with wrong or malicious servers. (CVE-2019-15718)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"text": "Red Hat OpenShift Container Platform is Red Hat\u0027s cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.\n\nThis is a text-only advisory for the machine-os-content container image, which includes RPM packages for Red Hat Enterprise Linux CoreOS.\n\nSecurity Fix(es):\n\n* A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU\u0027s local cache and system software\u0027s Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor.\n\nSystem software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory. Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor\u0027s Memory Management Unit (MMU) uses Paging structure entries to translate program\u0027s virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and other for data addresses.\n\nSystem software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor\u0027s TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change. (CVE-2018-12207)\n\n* A flaw was found in the way sudo implemented running commands with an arbitrary user ID. If a sudoers entry is written to allow users to run a command as any user except root, this flaw can be used by an attacker to bypass that restriction. (CVE-2019-14287)\n\n* An improper authorization flaw was discovered in systemd-resolved in the way it configures the exposed DBus interface org.freedesktop.resolve1. An unprivileged local user could call all DBus methods, even when marked as privileged operations. An attacker could abuse this flaw by changing the DNS, Search Domain, LLMNR, DNSSEC, and other network link settings without any authorization, giving them control of the network names resolution process and causing the system to communicate with wrong or malicious servers. (CVE-2019-15718)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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"title": "Red Hat Security Advisory: OpenShift Container Platform 4.1.24 machine-os-content-container security update",
"tracking": {
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"cve": "CVE-2018-12207",
"cwe": {
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"name": "Sensitive Information in Resource Not Removed Before Reuse"
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"ids": [
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"text": "1646768"
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"notes": [
{
"category": "description",
"text": "A flaw was found in the way Intel CPUs handle inconsistency between, virtual to physical memory address translations in CPU\u0027s local cache and system software\u0027s Paging structure entries. A privileged guest user may use this flaw to induce a hardware Machine Check Error on the host processor, resulting in a severe DoS scenario by halting the processor.\r\n\r\nSystem software like OS OR Virtual Machine Monitor (VMM) use virtual memory system for storing program instructions and data in memory. Virtual Memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor\u0027s Memory Management Unit (MMU) uses Paging structure entries to translate program\u0027s virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer called - Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and other for data addresses.\r\n\r\nSystem software can modify its Paging structure entries to change address mappings OR certain attributes like page size etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor\u0027s TLB cache. But before this TLB invalidation takes place, a privileged guest user may trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). Thus accessing an invalid physical memory address and resulting in halting the processor due to the Machine Check Error (MCE) on Page Size Change.",
"title": "Vulnerability description"
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{
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"text": "hw: Machine Check Error on Page Size Change (IFU)",
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{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-12207"
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"details": "For OpenShift Container Platform 4.1 see the following documentation, which\nwill be updated shortly for release 4.1.24, for important instructions on\nhow to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.openshift.com/container-platform/4.1/release_notes/ocp-4-1-release-notes.html",
"product_ids": [
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],
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"url": "https://access.redhat.com/errata/RHSA-2019:3941"
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{
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"details": "For mitigation related information, please refer to the Red Hat vulnerability article: https://access.redhat.com/security/vulnerabilities/ifu-page-mce .",
"product_ids": [
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]
}
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"scores": [
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
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"title": "hw: Machine Check Error on Page Size Change (IFU)"
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{
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],
"cve": "CVE-2019-14287",
"cwe": {
"id": "CWE-267",
"name": "Privilege Defined With Unsafe Actions"
},
"discovery_date": "2019-10-10T00:00:00+00:00",
"ids": [
{
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"text": "1760531"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the way sudo implemented running commands with arbitrary user ID. If a sudoers entry is written to allow the attacker to run a command as any user except root, this flaw can be used by the attacker to bypass that restriction.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "sudo: Privilege escalation via \u0027Runas\u0027 specification with \u0027ALL\u0027 keyword",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw only affects specific, non-default configurations of sudo, in which sudoers configuration entry allows a user to run a command as any user except root, for example:\n\nsomeuser myhost = (ALL, !root) /usr/bin/somecommand\n\nThis configuration allows user \"someuser\" to run somecommand as any other user except root. However, this flaw also allows someuser to run somecommand as root by specifying the target user using the numeric id of -1. Only the specified command can be run, this flaw does NOT allow user to run other commands that those specified in the sudoers configuration.\n\nAny other configurations of sudo (including configurations that allow user to run commands as any user including root and configurations that allow user to run command as a specific other user) are NOT affected by this flaw.\n\nRed Hat Virtualization Hypervisor includes an affected version of sudo, however the default configuration is not vulnerable to this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-14287"
},
{
"category": "external",
"summary": "RHBZ#1760531",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1760531"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-14287",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-14287"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-14287",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14287"
},
{
"category": "external",
"summary": "https://www.sudo.ws/alerts/minus_1_uid.html",
"url": "https://www.sudo.ws/alerts/minus_1_uid.html"
}
],
"release_date": "2019-10-14T15:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For OpenShift Container Platform 4.1 see the following documentation, which\nwill be updated shortly for release 4.1.24, for important instructions on\nhow to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.openshift.com/container-platform/4.1/release_notes/ocp-4-1-release-notes.html",
"product_ids": [
"Red Hat OpenShift Container Platform 4"
],
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"url": "https://access.redhat.com/errata/RHSA-2019:3941"
},
{
"category": "workaround",
"details": "This vulnerability only affects configurations of sudo that have a runas user list that includes an exclusion of root. The most simple example is:\n\n~~~\nsomeuser ALL=(ALL, !root) /usr/bin/somecommand\n~~~\n\nThe exclusion is specified using an excalamation mark (!). In this example, the \"root\" user is specified by name. The root user may also be identified in other ways, such as by user id:\n\n~~~\nsomeuser ALL=(ALL, !#0) /usr/bin/somecommand\n~~~\n\nor by reference to a runas alias:\n\n~~~\nRunas_Alias MYGROUP = root, adminuser\nsomeuser ALL=(ALL, !MYGROUP) /usr/bin/somecommand\n~~~\n\nTo ensure your sudoers configuration is not affected by this vulnerability, we recommend examining each sudoers entry that includes the `!` character in the runas specification, to ensure that the root user is not among the exclusions. These can be found in the /etc/sudoers file or files under /etc/sudoers.d.",
"product_ids": [
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"Red Hat OpenShift Container Platform 4"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "sudo: Privilege escalation via \u0027Runas\u0027 specification with \u0027ALL\u0027 keyword"
},
{
"cve": "CVE-2019-15718",
"cwe": {
"id": "CWE-285",
"name": "Improper Authorization"
},
"discovery_date": "2019-08-27T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1746057"
}
],
"notes": [
{
"category": "description",
"text": "An improper authorization flaw was discovered in systemd-resolved in the way it configures the exposed DBus interface org.freedesktop.resolve1. An unprivileged local attacker could call all DBus methods, even when marked as privileged operations. An attacker could abuse this flaw by changing the DNS, Search Domain, LLMNR, DNSSEC and other network link settings without any authorization, allowing control of the network names resolution process and cause the system to communicate with wrong or malicious servers.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "systemd: systemd-resolved allows unprivileged users to configure DNS",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the versions of systemd as shipped with Red Hat Enterprise Linux 7 as the shipped systemd-resolved does not provide any privileged DBus method.\nThis issue does affect the versions of systemd as shipped with Red Hat Enterprise Linux 8, however the systemd-resolved service is not enabled by default, so the flaw cannot be exploited unless the service was manually enabled.\n\nThe flaw was rated as Moderate as it requires a local attacker and changing the DNS servers cannot compromise the system by itself, though it could be used for phishing attacks or to redirect the users to malicious websites. Moreover, on Red Hat Enterprise Linux 8 systemd-resolved needs to be manually enabled by an administrator to make the system vulnerable.\n\nOpenShift Container Platform 4 includes a vulnerable version of systemd on RHEL CoreOS nodes. However, the systemd-resolved service is removed from RHEL CoreOS instances, making this vulnerability not exploitable. This flaw is rated Low for OpenShift Container Platform 4.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat OpenShift Container Platform 4"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-15718"
},
{
"category": "external",
"summary": "RHBZ#1746057",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1746057"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-15718",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-15718"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-15718",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15718"
}
],
"release_date": "2019-09-03T15:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For OpenShift Container Platform 4.1 see the following documentation, which\nwill be updated shortly for release 4.1.24, for important instructions on\nhow to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.openshift.com/container-platform/4.1/release_notes/ocp-4-1-release-notes.html",
"product_ids": [
"Red Hat OpenShift Container Platform 4"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2019:3941"
},
{
"category": "workaround",
"details": "Disable systemd-resolved service by using `sudo systemctl disable systemd-resolved`.",
"product_ids": [
"Red Hat OpenShift Container Platform 4"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
"version": "3.0"
},
"products": [
"Red Hat OpenShift Container Platform 4"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "systemd: systemd-resolved allows unprivileged users to configure DNS"
}
]
}
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