RHSA-2011:1531
Vulnerability from csaf_redhat - Published: 2011-12-05 20:23 - Updated: 2026-06-27 15:04Summary
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.
Cause: qemu did not properly drop extra group privileges when started as root with the -runas commandline option. Consequence: extra GID's would give qemu elevated privileges to read or write files that the supplementary groups allowed, because qemu is still running with group root privileges. Fix: Added an initgroups(3) call to use the -runas user's /etc/groups membership to update the supplementary group IDs. Result: extra group privileges are now properly dropped when using -runas.
3.7 ()
Affected products
Fixed
20 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Client:qemu-img-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Client:qemu-kvm-2:0.12.1.2-2.209.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Client:qemu-kvm-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Client:qemu-kvm-debuginfo-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Client:qemu-kvm-tools-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6ComputeNode:qemu-img-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6ComputeNode:qemu-kvm-2:0.12.1.2-2.209.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6ComputeNode:qemu-kvm-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6ComputeNode:qemu-kvm-debuginfo-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6ComputeNode:qemu-kvm-tools-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server:qemu-img-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server:qemu-kvm-2:0.12.1.2-2.209.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server:qemu-kvm-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server:qemu-kvm-debuginfo-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Server:qemu-kvm-tools-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Workstation:qemu-img-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Workstation:qemu-kvm-2:0.12.1.2-2.209.el6.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Workstation:qemu-kvm-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Workstation:qemu-kvm-debuginfo-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 6Workstation:qemu-kvm-tools-2:0.12.1.2-2.209.el6.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
References
92 references
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"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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"title": "qemu: when started as root, extra groups are not dropped correctly"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.