RHSA-2018_2364
Vulnerability from csaf_redhat - Published: 2018-08-07 14:21 - Updated: 2024-11-15 02:11Summary
Red Hat Security Advisory: qemu-kvm-rhev security update
Notes
Topic
An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform
8.
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
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on a variety of architectures. The qemu-kvm-rhev packages provide the
user-space component for running virtual machines that use KVM in
environments managed by Red Hat products.
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)
Acknowledgements:
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center)
and Jann Horn (Google Project Zero) for reporting this issue.
Note: This is the qemu-kvm-rhev side of the CVE-2018-3639 mitigation that
includes support for guests running on hosts with AMD processors.
For more details about the security issue(s), including the impact, a CVSS
score, 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": "KVM (Kernel-based Virtual Machine) is a full virtualization solution for\nLinux on a variety of architectures. The qemu-kvm-rhev packages provide the\nuser-space component for running virtual machines that use KVM in\nenvironments managed by Red Hat products.\n\nSecurity fix(es):\n* An industry-wide issue was found in the way many modern microprocessor\ndesigns have implemented speculative execution of Load \u0026 Store instructions\n(a commonly used performance optimization). It relies on the presence of a\nprecisely-defined instruction sequence in the privileged code as well as\nthe fact that memory read from address to which a recent memory write has\noccurred may see an older value and subsequently cause an update into the\nmicroprocessor\u0027s data cache even for speculatively executed instructions\nthat never actually commit (retire). As a result, an unprivileged attacker\ncould use this flaw to read privileged memory by conducting targeted cache\nside-channel attacks. (CVE-2018-3639)\n\nAcknowledgements:\n\nRed Hat would like to thank Ken Johnson (Microsoft Security Response Center)\nand Jann Horn (Google Project Zero) for reporting this issue.\n\nNote: This is the qemu-kvm-rhev side of the CVE-2018-3639 mitigation that\nincludes support for guests running on hosts with AMD processors.\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, and other related information, refer to the CVE page(s) listed in\nthe References section.",
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{
"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"
}
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{
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},
{
"category": "external",
"summary": "https://software.intel.com/sites/default/files/managed/b9/f9/336983-Intel-Analysis-of-Speculative-Execution-Side-Channels-White-Paper.pdf",
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},
{
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"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",
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{
"category": "vendor_fix",
"date": "2018-08-07T14:21:38+00:00",
"details": "For details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"scores": [
{
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"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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"details": "Important"
}
],
"title": "hw: cpu: speculative store bypass"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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