rhsa-2018_1662
Vulnerability from csaf_redhat
Published
2018-05-22 01:40
Modified
2024-11-15 02:09
Summary
Red Hat Security Advisory: qemu-kvm security update
Notes
Topic
An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.3 Extended Update Support.
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
Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.
Security Fix(es):
* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)
Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.
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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"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Jann Horn"
],
"organization": "Google Project Zero"
},
{
"names": [
"Ken Johnson"
],
"organization": "Microsoft Security Response Center"
}
],
"cve": "CVE-2018-3639",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"discovery_date": "2018-03-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1566890"
}
],
"notes": [
{
"category": "description",
"text": "An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load \u0026 Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor\u0027s data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "hw: cpu: speculative store bypass",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/ssbd",
"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": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2018-3639"
},
{
"category": "external",
"summary": "RHBZ#1566890",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1566890"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-3639",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-3639"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-3639",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-3639"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/vulnerabilities/ssbd",
"url": "https://access.redhat.com/security/vulnerabilities/ssbd"
},
{
"category": "external",
"summary": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528",
"url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=1528"
},
{
"category": "external",
"summary": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf",
"url": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf"
},
{
"category": "external",
"summary": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf",
"url": "https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf"
},
{
"category": "external",
"summary": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html",
"url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00115.html"
}
],
"release_date": "2018-05-21T21:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2018-05-22T01:40:36+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2018:1662"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.0"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "hw: cpu: speculative store bypass"
}
]
}
Loading…
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Sightings
| Author | Source | Type | Date |
|---|
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.