RHSA-2011_0534
Vulnerability from csaf_redhat - Published: 2011-05-19 11:15 - Updated: 2024-11-22 03:59Summary
Red Hat Security Advisory: qemu-kvm security, bug fix, and enhancement update
Severity
Important
Notes
Topic: Updated qemu-kvm packages that fix two security issues, several bugs, and
add various enhancements are now available for Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
Details: KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component
for running virtual machines using KVM.
It was found that the virtio-blk driver in qemu-kvm did not properly
validate read and write requests from guests. A privileged guest user could
use this flaw to crash the guest or, possibly, execute arbitrary code on
the host. (CVE-2011-1750)
It was found that the PIIX4 Power Management emulation layer in qemu-kvm
did not properly check for hot plug eligibility during device removals. A
privileged guest user could use this flaw to crash the guest or, possibly,
execute arbitrary code on the host. (CVE-2011-1751)
Red Hat would like to thank Nelson Elhage for reporting CVE-2011-1751.
This update also fixes several bugs and adds various enhancements.
Documentation for these bug fixes and enhancements will be available
shortly from the Technical Notes document, linked to in the References
section.
All users of qemu-kvm should upgrade to these updated packages, which
contain backported patches to resolve these issues, and fix the bugs and
add the enhancements noted in the Technical Notes. After 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.
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.
Multiple heap-based buffer overflows in the virtio-blk driver (hw/virtio-blk.c) in qemu-kvm 0.14.0 allow local guest users to cause a denial of service (guest crash) and possibly gain privileges via a (1) write request to the virtio_blk_handle_write function or (2) read request to the virtio_blk_handle_read function that is not properly aligned.
7.4 ()
Vendor Fix
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259
https://access.redhat.com/errata/RHSA-2011:0534
The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to "active qemu timers."
7.4 ()
Vendor Fix
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259
https://access.redhat.com/errata/RHSA-2011:0534
References
Acknowledgments
Nelson Elhage
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"text": "The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to \"active qemu timers.\"",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "qemu: acpi_piix4: missing hotplug check during device removal",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue only affects Red Hat Enterprise Linux 6. The version of the qemu/kvm as shipped with Red Hat Enterprise Linux 5 is not affected.",
"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-2011-1751"
},
{
"category": "external",
"summary": "RHBZ#699773",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=699773"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2011-1751",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-1751"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-1751",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2011-1751"
}
],
"release_date": "2011-05-18T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2011-05-19T11:15:00+00:00",
"details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2011:0534"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "MEDIUM",
"accessVector": "ADJACENT_NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.4,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:A/AC:M/Au:S/C:C/I:C/A:C",
"version": "2.0"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "qemu: acpi_piix4: missing hotplug check during device removal"
}
]
}
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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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