RHSA-2011:1531
Vulnerability from csaf_redhat - Published: 2011-12-05 20:23 - Updated: 2025-11-21 17:39Summary
Red Hat Security Advisory: qemu-kvm security, bug fix, and enhancement update
Severity
Moderate
Notes
Topic: Updated qemu-kvm packages that fix one security issue, multiple 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 moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link 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 qemu-kvm did not properly drop supplemental group
privileges when the root user started guests from the command line
("/usr/libexec/qemu-kvm") with the "-runas" option. A qemu-kvm process
started this way could use this flaw to gain access to files on the host
that are accessible to the supplementary groups and not accessible to the
primary group. (CVE-2011-2527)
Note: This issue only affected qemu-kvm when it was started directly from
the command line. It did not affect the Red Hat Enterprise Virtualization
platform or applications that start qemu-kvm via libvirt, such as the
Virtual Machine Manager (virt-manager).
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 are advised to upgrade to these updated packages,
which contain backported patches to correct these issues and add these
enhancements. 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.
The change_process_uid function in os-posix.c in Qemu 0.14.0 and earlier does not properly drop group privileges when the -runas option is used, which allows local guest users to access restricted files on the host.
3.7 ()
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-2011:1531
References
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"text": "The change_process_uid function in os-posix.c in Qemu 0.14.0 and earlier does not properly drop group privileges when the -runas option is used, which allows local guest users to access restricted files on the host.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "qemu: when started as root, extra groups are not dropped correctly",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "Future qemu-kvm updates in Red Hat Enterprise Linux 6 may address this flaw. This issue did not affect the versions of qemu-kvm as shipped with Red Hat Enterprise Linux 5 as it did not include support for \"run as\" functionality.",
"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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"threats": [
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"details": "Moderate"
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],
"title": "qemu: when started as root, extra groups are not dropped correctly"
}
]
}
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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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