CVE-2018-15468
published 2018-08-17CVE-2018-15468: An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In…
PriorityP418medium6CVSS 3.0
AVLACLPRHUINSCCNINAH
EPSS
0.34%
25.9th percentile
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xen | < xen 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 (bookworm) | xen 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 (bookworm) |
| xen | xen | <= 4.11.0 | — |
| xen | xen | >= 0 < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 | 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 |
| xen | xen | >= 0 < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 | 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 |
| xen | xen | >= 0 < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 | 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 |
| xen | xen | >= 0 < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 | 4.11.1~pre.20180911.5acdd26fdc+dfsg-2 |
CVSS provenance
nvdv3.06.0MEDIUMCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
nvdv2.04.9MEDIUMAV:L/AC:L/Au:N/C:N/I:N/A:C
osv6.0MEDIUM
vendor_debian6.0MEDIUM
vendor_redhat6.0MEDIUM
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Red Hat
xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
vendor_redhat·2018-08-14·CVSS 6.0
CVE-2018-15468 [MEDIUM] CWE-665 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
Package: xen (Red Hat Enterprise Linux 5) - Not affected
Debian
CVE-2018-15468: xen - An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several...
vendor_debian·2018·CVSS 6.0
CVE-2018-15468 [MEDIUM] CVE-2018-15468: xen - An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several...
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
Scope: local
bookworm: resolved (fixed in 4.11.1~pre.20180911.5acdd26fdc+dfsg-2)
bullseye: resolved (fixed in 4.11.1~pre.20180911.5acdd26fdc+dfsg-2)
forky: resol
GHSA
GHSA-m48w-fvxv-5j3g: An issue was discovered in Xen through 4
ghsa_unreviewed·2022-05-13
CVE-2018-15468 [MEDIUM] CWE-863 GHSA-m48w-fvxv-5j3g: An issue was discovered in Xen through 4
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
OSV
CVE-2018-15468: An issue was discovered in Xen through 4
osv·2018-08-17·CVSS 6.0
CVE-2018-15468 [MEDIUM] CVE-2018-15468: An issue was discovered in Xen through 4
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269) [fedora-all]
bugzilla·2018-08-14·CVSS 6.0
CVE-2018-15468 [MEDIUM] CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269) [fedora-all]
CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269) [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects mul
Bugzilla
CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
bugzilla·2018-07-31·CVSS 6.0
CVE-2018-15468 [MEDIUM] CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)
A flaw was found in xen. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. A malicious or buggy guest administrator can lock up the entire host, causing a Denial of Service.
Discussion:
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 1616077]
2018-08-17
Published