RHSA-2018_1104
Vulnerability from csaf_redhat - Published: 2018-04-10 18:54 - Updated: 2024-11-15 02:07Summary
Red Hat Security Advisory: qemu-kvm-rhev security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for qemu-kvm-rhev is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7.
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.
The following packages have been upgraded to a later upstream version: qemu-kvm-rhev (2.10.0). (BZ#1470749)
Security Fix(es):
* Qemu: stack buffer overflow in NBD server triggered via long export name (CVE-2017-15118)
* Qemu: DoS via large option request (CVE-2017-15119)
* Qemu: vga: OOB read access during display update (CVE-2017-13672)
* Qemu: vga: reachable assert failure during display update (CVE-2017-13673)
* Qemu: Slirp: use-after-free when sending response (CVE-2017-13711)
* Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)
* Qemu: I/O: potential memory exhaustion via websock connection to VNC (CVE-2017-15268)
* Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)
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.
Red Hat would like to thank David Buchanan for reporting CVE-2017-13672 and CVE-2017-13673; Wjjzhang (Tencent.com) for reporting CVE-2017-13711; and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683. The CVE-2017-15118 and CVE-2017-15119 issues were discovered by Eric Blake (Red Hat) and the CVE-2017-15124 issue was discovered by Daniel Berrange (Red Hat).
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.
An out-of-bounds read access issue was found in the VGA display emulator built into the Quick emulator (QEMU). It could occur while reading VGA memory to update graphics display. A privileged user/process inside guest could use this flaw to crash the QEMU process on the host resulting in denial of service situation.
CWE-125 - Out-of-bounds Read
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
An assert failure issue was found in the VGA display emulator built into the Quick emulator (QEMU). It could occur while updating graphics display, due to miscalculating region for dirty bitmap snapshot in split screen mode. A privileged user/process inside guest could use this flaw to crash the QEMU process on the host resulting in denial of service.
CWE-617 - Reachable Assertion
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
A use-after-free issue was found in the Slirp networking implementation of the Quick emulator (QEMU). It occurs when a Socket referenced from multiple packets is freed while responding to a message. A user/process could use this flaw to crash the QEMU process on the host resulting in denial of service.
CWE-416 - Use After Free
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu allowing a client to request an export name of size up to 4096 bytes, which in fact should be limited to 256 bytes, allowing causing an out-of-bounds stack write in the qemu process. If NBD server requires TLS, the attacker cannot trigger the buffer overflow without first successfully negotiating TLS.
8.3 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
The Network Block Device (NBD) server in Quick Emulator (QEMU), is vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS.
5.8 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
VNC server implementation in Quick Emulator (QEMU) was found to be vulnerable to an unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A malicious remote VNC client could use this flaw to cause DoS to the server host.
CWE-770 - Allocation of Resources Without Limits or Throttling
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
A memory leakage issue was found in the I/O channels websockets implementation of the Quick Emulator (QEMU). It could occur while sending screen updates to a client, which is slow to read and process them further. A privileged guest user could use this flaw to cause a denial of service on the host and/or potentially crash the QEMU process instance on the host.
CWE-400 - Uncontrolled Resource Consumption
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
An out-of-bounds read access issue was found in the VGA emulator of QEMU. It could occur in vga_draw_text routine, while updating display area for a vnc client. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS.
CWE-125 - Out-of-bounds Read
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
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.
https://access.redhat.com/errata/RHSA-2018:1104
References
Acknowledgments
David Buchanan
Tencent.com
Wjjzhang
Red Hat
Eric Blake
Red Hat
Daniel Berrange
Jiang Xin
Lin ZheCheng
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{
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"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": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2018:1104"
}
],
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{
"cvss_v2": {
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"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "PARTIAL",
"baseScore": 2.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:H/Au:S/C:N/I:N/A:P",
"version": "2.0"
},
"cvss_v3": {
"attackComplexity": "HIGH",
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"availabilityImpact": "LOW",
"baseScore": 3.0,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:L",
"version": "3.0"
},
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],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "QEMU: I/O: potential memory exhaustion via websock connection to VNC"
},
{
"acknowledgments": [
{
"names": [
"Jiang Xin",
"Lin ZheCheng"
]
}
],
"cve": "CVE-2018-5683",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2017-12-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1530356"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds read access issue was found in the VGA emulator of QEMU. It could occur in vga_draw_text routine, while updating display area for a vnc client. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Qemu: Out-of-bounds read in vga_draw_text routine",
"title": "Vulnerability summary"
},
{
"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-2018-5683"
},
{
"category": "external",
"summary": "RHBZ#1530356",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1530356"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-5683",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-5683"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-5683",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5683"
}
],
"release_date": "2017-12-25T00:00:00+00:00",
"remediations": [
{
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"threats": [
{
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"details": "Low"
}
],
"title": "Qemu: Out-of-bounds read in vga_draw_text routine"
}
]
}
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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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