CVE-2017-1000256
published 2017-10-31CVE-2017-1000256: libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate…
PriorityP337high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
1.70%
74.6th percentile
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | libvirt | < libvirt 3.8.0-3 (bookworm) | libvirt 3.8.0-3 (bookworm) |
| msrc | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cm1_libvirt_6.1.0-1_on_cbl_mariner_1.0 | — | — |
| redhat | libvirt | >= 0 < 3.8.0-3 | 3.8.0-3 |
| redhat | libvirt | >= 0 < 3.8.0-3 | 3.8.0-3 |
| redhat | libvirt | >= 0 < 3.8.0-3 | 3.8.0-3 |
| redhat | libvirt | >= 0 < 3.8.0-3 | 3.8.0-3 |
| redhat | libvirt | >= 0 < 1.2.2-0ubuntu13.1.26 | 1.2.2-0ubuntu13.1.26 |
| redhat | libvirt | >= 0 < 1.3.1-1ubuntu10.19 | 1.3.1-1ubuntu10.19 |
| redhat | libvirt | >= 2.3.0 < 3.9.0 | 3.9.0 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.06.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
osv9.8CRITICAL
vendor_ubuntu9.8CRITICAL
vendor_debian8.1HIGH
vendor_msrc8.1HIGH
vendor_redhat8.1HIGH
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Ubuntu
libvirt vulnerabilities
vendor_ubuntu·2018-02-20·CVSS 9.8
CVE-2016-5008 [CRITICAL] libvirt vulnerabilities
Title: libvirt vulnerabilities
Summary: Several security issues were fixed in libvirt.
Vivian Zhang and Christoph Anton Mitterer discovered that libvirt
incorrectly disabled password authentication when the VNC password was set
to an empty string. A remote attacker could possibly use this issue to
bypass authentication, contrary to expectations. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-5008)
Daniel P. Berrange discovered that libvirt incorrectly handled validating
SSL/TLS certificates. A remote attacker could possibly use this issue to
obtain sensitive information. This issue only affected Ubuntu 17.10.
(CVE-2017-1000256)
Daniel P. Berrange and Peter Krempa discovered that libvirt incorrectly
handled large QEMU replies. An attacker could possibly use th
Red Hat
libvirt: TLS certificate verification disabled for clients
vendor_redhat·2017-10-16·CVSS 8.1
CVE-2017-1000256 [HIGH] CWE-295 libvirt: TLS certificate verification disabled for clients
libvirt: TLS certificate verification disabled for clients
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
Package: libvirt (Red Hat Enterprise Linux 5) - Will not fix
Package: libvirt (Red Hat Enterprise Linux 6) - Will not fix
Package: libvirt (Red Hat Enterprise Linux 7) - Will not fix
Package: mingw-virt-viewer (Red Hat Enterprise Virtualization 3) - Will not fix
Package: libvirt (Red Hat Storage 3) - Not affected
Microsoft
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
vendor_msrc·2017-10-10·CVSS 8.1
CVE-2017-1000256 [HIGH] CWE-295 libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to re
Debian
CVE-2017-1000256: libvirt - libvirt version 2.3.0 and later is vulnerable to a bad default configuration of ...
vendor_debian·2017·CVSS 8.1
CVE-2017-1000256 [HIGH] CVE-2017-1000256: libvirt - libvirt version 2.3.0 and later is vulnerable to a bad default configuration of ...
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
Scope: local
bookworm: resolved (fixed in 3.8.0-3)
bullseye: resolved (fixed in 3.8.0-3)
forky: resolved (fixed in 3.8.0-3)
sid: resolved (fixed in 3.8.0-3)
trixie: resolved (fixed in 3.8.0-3)
GHSA
GHSA-gq8m-rwgg-6vv3: libvirt version 2
ghsa_unreviewed·2022-05-13
CVE-2017-1000256 [HIGH] CWE-295 GHSA-gq8m-rwgg-6vv3: libvirt version 2
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
OSV
libvirt vulnerabilities
osv·2018-02-20·CVSS 9.8
CVE-2016-5008 [CRITICAL] libvirt vulnerabilities
libvirt vulnerabilities
Vivian Zhang and Christoph Anton Mitterer discovered that libvirt
incorrectly disabled password authentication when the VNC password was set
to an empty string. A remote attacker could possibly use this issue to
bypass authentication, contrary to expectations. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-5008)
Daniel P. Berrange discovered that libvirt incorrectly handled validating
SSL/TLS certificates. A remote attacker could possibly use this issue to
obtain sensitive information. This issue only affected Ubuntu 17.10.
(CVE-2017-1000256)
Daniel P. Berrange and Peter Krempa discovered that libvirt incorrectly
handled large QEMU replies. An attacker could possibly use this issue to
cause libvirt to crash, resulting in a denial of ser
OSV
CVE-2017-1000256: libvirt version 2
osv·2017-10-31·CVSS 8.1
CVE-2017-1000256 [HIGH] CVE-2017-1000256: libvirt version 2
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2017-1000256 mingw-libvirt: libvirt: TLS certificate verification disabled for clients [fedora-all]
bugzilla·2017-10-18·CVSS 8.1
CVE-2017-1000256 [HIGH] CVE-2017-1000256 mingw-libvirt: libvirt: TLS certificate verification disabled for clients [fedora-all]
CVE-2017-1000256 mingw-libvirt: libvirt: TLS certificate verification disabled for clients [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 m
Bugzilla
CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients
bugzilla·2017-10-18·CVSS 8.1
CVE-2017-1000256 [HIGH] CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients
CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients
The default_tls_x509_verify (and related) parameters in qemu.conf
control whether the TLS servers in QEMU request & verify
certificates from clients. This works as a simple access control
system for QEMU servers by requiring the CA to issue certs to
permitted clients. This use of client certificates is disabled by
default, since it requires extra work to issue client certificates.
Unfortunately the libvirt code was using these configuration
parameters when setting up both TLS clients and servers in QEMU. The
result was that TLS clients for character devices and disk devices
had verification turned off, meaning they would ignore any errors
while validating the server certificate.
A MITM attacker can attack any cli
Bugzilla
CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients [fedora-all]
bugzilla·2017-10-18·CVSS 8.1
CVE-2017-1000256 [HIGH] CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients [fedora-all]
CVE-2017-1000256 libvirt: TLS certificate verification disabled for clients [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 multiple support
http://www.debian.org/security/2017/dsa-4003https://access.redhat.com/security/cve/CVE-2017-1000256https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1556251.htmlhttps://www.redhat.com/archives/libvirt-announce/2017-October/msg00001.htmlhttp://www.debian.org/security/2017/dsa-4003https://access.redhat.com/security/cve/CVE-2017-1000256https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1556251.htmlhttps://www.redhat.com/archives/libvirt-announce/2017-October/msg00001.html
2017-10-31
Published