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CVE-2020-10756

Public on

Moderate ImpactWhat does this mean?
6.5CVSS v3 Base ScoreCVSS Score Breakdown


INSIGHTS VULNERABILITY ANALYSIS

View exposed systems


DESCRIPTION

An out-of-bounds read vulnerability was found in the SLiRP networking
implementation of the QEMU emulator. This flaw occurs in the
icmp6_send_echoreply() routine while replying to an ICMP echo request, also
known as ping. This flaw allows a malicious guest to leak the contents of the
host memory, resulting in possible information disclosure.


STATEMENT

This flaw did not affect the versions of SLiRP embedded in `qemu-kvm` as shipped
with Red Hat Enterprise Linux 6 and 7, as they did not include support for
ICMPv6, which was introduced in a later version of the package. OpenShift 4.x
packages slirp4netns as a dependency of podman however podman doesn't set the
--enable-ipv6 flag. Hence the impact has been reduced to low, as the code is
still being packaged and podman might decide to enable IPv6 in future. In Red
Hat OpenStack Platform, because the flaw has a lower impact and the fix would
require a substantial amount of development, no update will be provided at this
time for the RHOSP qemu-kvm-rhev package.

This flaw did not affect the versions of SLiRP embedded in qemu-kvm as shipped
with Red Hat Enterprise Linux 6 and 7, as they did not include support for
ICMPv6, which was introduced in a later version of the package.

OpenShift 4.x packages slirp4netns as a dependency of podman however podman
doesn't set the --enable-ipv6 flag. Hence the impact has been reduced to low, as
the code is still being packaged and podman might decide to enable IPv6 in
future.

In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix
would require a substantial amount of development, no update will be provided at
this time for the RHOSP qemu-kvm-rhev package.




ADDITIONAL INFORMATION

 * Bugzilla 1835986: CVE-2020-10756 QEMU: slirp: networking out-of-bounds read
   information disclosure vulnerability
 * CWE-125: Out-of-bounds Read
 * FAQ: Frequently asked questions about CVE-2020-10756


AFFECTED PACKAGES AND ISSUED RED HAT SECURITY ERRATA

Search:

PlatformPackageStateErrataRelease DateRed Hat Enterprise Linux
8virt:rhelFixedRHSA-2020:4059Red Hat Enterprise Linux 8 Advanced
Virtualizationvirt:8.3/qemu-kvmAffectedRed Hat Enterprise Linux 8 Advanced
Virtualizationvirt:8.2/qemu-kvmAffectedAdvanced Virtualization for RHEL
8.2.1virt:8.2FixedRHSA-2020:3586Red Hat Enterprise Linux 8 Advanced
Virtualizationvirt:8.1/qemu-kvmAffectedRed Hat Enterprise Linux
8virt-devel:rhelFixedRHSA-2020:4059Advanced Virtualization for RHEL
8.2.1virt-devel:8.2FixedRHSA-2020:3586Red Hat OpenShift Container Platform
4slirp4netns low Will not fixRed Hat Enterprise Linux 7slirp4netnsWill not
fixRed Hat Enterprise Linux 7qemu-kvm-rhevWill not fix

Show 102550100 entries
FirstPrevious12NextLast
Showing 1 to 10 of 19 entries


Unless explicitly stated as not affected, all previous versions of packages in
any minor update stream of a product listed here should be assumed vulnerable,
although may not have been subject to full analysis.


COMMON VULNERABILITY SCORING SYSTEM (CVSS) SCORE DETAILS


CVSS V3 SCORE BREAKDOWN

Red HatNVDCVSS v3 Base Score6.56.5Attack VectorLocalLocalAttack
ComplexityLowLowPrivileges RequiredLowLowUser
InteractionNoneNoneScopeChangedChangedConfidentialityHighHighIntegrity
ImpactNoneNoneAvailability ImpactNoneNone


CVSS V3 VECTOR

Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N


ACKNOWLEDGEMENTS

Red Hat would like to thank VictorV (360 Vulcan Team) and Ziming Zhang (Qi An
Xin Group) for reporting this issue.


EXTERNAL REFERENCES

https://www.zerodayinitiative.com/advisories/ZDI-20-1005/

https://www.zerodayinitiative.com/advisories/ZDI-20-1005/


FREQUENTLY ASKED QUESTIONS


WHY IS RED HAT'S CVSS V3 SCORE OR IMPACT DIFFERENT FROM OTHER VENDORS?

For open source software shipped by multiple vendors, the CVSS base scores may
vary for each vendor's version depending on the version they ship, how they ship
it, the platform, and even how the software is compiled. This makes scoring of
vulnerabilities difficult for third-party vulnerability databases such as NVD
that only provide a single CVSS base score for each vulnerability. Red Hat
scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.


MY PRODUCT IS LISTED AS "UNDER INVESTIGATION" OR "AFFECTED", WHEN WILL RED HAT
RELEASE A FIX FOR THIS VULNERABILITY?

 * "Under investigation" doesn't necessarily mean that the product is affected
   by this vulnerability. It only means that our Analysis Team is still working
   on determining whether the product is affected and how it is affected.
 * "Affected" means that our Analysis Team has determined that this product is
   affected by this vulnerability and might release a fix to address this in the
   near future.


WHAT CAN I DO IF MY PRODUCT IS LISTED AS "WILL NOT FIX"?

This depends mostly on the Impact of the vulnerability and the Life Cycle phase
in which your product is currently in. Overall, you have the following options:
 * Upgrade to a supported product version that includes a fix for this
   vulnerability (recommended)
 * Apply a mitigation (if one exists)
 * Open a support case to request a prioritization of releasing a fix for this
   vulnerability


WHY IS MY SECURITY SCANNER REPORTING MY PRODUCT AS VULNERABLE TO THIS
VULNERABILITY EVEN THOUGH MY PRODUCT VERSION IS FIXED OR NOT AFFECTED?

In order to maintain code stability and compatibility, Red Hat usually does not
rebase packages to entirely new versions. Instead, we backport fixes and new
features to an older version of the package we distribute. This can result in
some security scanners that only consider the package version to report the
package as vulnerable. To avoid this, we suggest that you use an OVAL-compatible
security scanner like OpenSCAP.

For more information, see https://access.redhat.com/blogs/766093/posts/2998921.


MY PRODUCT IS LISTED AS "OUT OF SUPPORT SCOPE". WHAT DOES THIS MEAN?

When a product is listed as "Out of Support Scope", it means a vulnerability
with the impact level assigned to this CVE is no longer covered by its current
support lifecycle phase. The product has been identified to contain the impacted
component, but analysis to determine whether it is affected or not by this
vulnerability was not performed. The product should be assumed to be affected.
Customers are advised to apply any mitigation options documented on this page,
consider removing or disabling the impacted component, or upgrade to a supported
version of the product that has an update available.

This page is generated automatically and has not been checked for errors or
omissions.

For clarification or corrections please contact Red Hat Product Security.

Last Modified:

CVE description copyright © 2021


Red Hat


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