A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2019-2294 advisory.

  - A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets     interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash     libvirtd and cause a denial of service. (CVE-2019-3840)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

A NULL pointer dereference flaw was discovered in libvirt in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service. (CVE-2019-3840)

According to the versions of the libvirt packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - libvirt: arbitrary file read/exec via     virDomainSaveImageGetXMLDesc API (CVE-2019-10161)

  - libvirt: arbitrary command execution via     virConnectGetDomainCapabilities API (CVE-2019-10167)

  - libvirt: NULL pointer dereference after running     qemuAgentCommand in qemuAgentGetInterfaces     function(CVE-2019-3840)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for libvirt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems.
In addition, libvirt provides tools for remote management of virtualized systems.

Security Fix(es) :

* libvirt: NULL pointer dereference after running qemuAgentCommand in qemuAgentGetInterfaces function (CVE-2019-3840)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.7 Release Notes linked from the References section.

Security Fix(es) :

  - libvirt: NULL pointer dereference after running     qemuAgentCommand in qemuAgentGetInterfaces function     (CVE-2019-3840)

According to the version of the libvirt packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A NULL pointer dereference flaw was discovered in     libvirt in the way it gets interface information     through the QEMU agent. An attacker in a guest VM can     use this flaw to crash libvirtd and cause a denial of     service.(CVE-2019-3840)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the libvirt package has been released.

According to the versions of the libvirt packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - util/virlog.c in libvirt does not properly determine     the hostname on LXC container startup, which allows     local guest OS users to bypass an intended container     protection mechanism and execute arbitrary commands via     a crafted NSS module.(CVE-2018-6764)

  - qemu/qemu_monitor.c in libvirt allows attackers to     cause a denial of service (memory consumption) via a     large QEMU reply.(CVE-2018-5748)

  - 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. (CVE-2019-3840)

  - 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.(CVE-2017-1000256)

  - An incomplete fix for CVE-2018-5748 that affects QEMU     monitor leading to a resource exhaustion but now also     triggered via QEMU guest agent.(CVE-2018-1064)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the libvirt packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

  - A NULL pointer dereference flaw was discovered in     libvirt in the way it gets interface information     through the QEMU agent. An attacker in a guest VM can     use this flaw to crash libvirtd and cause a denial of     service.(CVE-2019-3840)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libvirt fixes the following issues :

Security issues fixed :

  - CVE-2019-3840: Fixed a NULL pointer dereference     vulnerability in virJSONValueObjectHasKey function which     could have resulted in a remote denial of service via     the guest agent (bsc#1127458). 

  - CVE-2019-3886: Fixed an information leak which allowed     to retrieve the guest hostname under readonly mode     (bsc#1131595).

Other issue addressed :

  - cpu: add Skylake-Server and Skylake-Server-IBRS CPU     models (FATE#327261, bsc#1131955)

  - libxl: save current memory value after successful     balloon (bsc#1120813).

  - libxl: support Xen's max_grant_frames setting with     maxGrantFrames attribute on the xenbus controller     (bsc#1126325).

  - conf: add new 'xenbus' controller type

This update was imported from the SUSE:SLE-12-SP3:Update update project.

This update for libvirt fixes the following issues :

Security issues fixed :

CVE-2019-3840: Fixed a NULL pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

CVE-2019-3886: Fixed an information leak which allowed to retrieve the guest hostname under readonly mode (bsc#1131595).

Other issue addressed: cpu: add Skylake-Server and Skylake-Server-IBRS CPU models (FATE#327261, bsc#1131955)

libxl: save current memory value after successful balloon (bsc#1120813).

libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).

conf: add new 'xenbus' controller type

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libvirt provides the following fixes :

Security issue fixed :

  - CVE-2019-3840: Fixed a NULL pointer dereference     vulnerability in virJSONValueObjectHasKey function which     could have resulted in a remote denial of service via     the guest agent (bsc#1127458). 

Other issues addressed :

  - apparmor: reintroduce upstream lxc mount rules     (bsc#1130129).

  - hook: encode incoming XML to UTF-8 before passing to     lxml etree from string method (bsc#1123642).

  - supportconfig: collect rotated logs in     /var/log/libvirt/* (bsc#1124667).

  - libxl: support Xen's max_grant_frames setting with     maxGrantFrames attribute on the xenbus controller     (bsc#1126325).

  - conf: added new 'xenbus' controller type

  - util: skip RDMA detection for non-PCI network devices     (bsc#1112182).

  - qemu: don't use CAP_DAC_OVERRIDE capability if non-root     (bsc#1125665).

  - qemu: fix issues related to restricted permissions on     /dev/sev(bsc#1102604).

  - apparmor: add support for named profiles (bsc#1118952).

  - libxl: save current memory value after successful     balloon (bsc#1120813).

  - apparmor: Fix ptrace rules. (bsc#1117058)

  - libxl: Add support for soft reset. (bsc#1081516)

  - libxl: Fix VM migration on busy hosts. (bsc#1108086)

  - qemu: Add support for SEV guests. (fate#325817)

  - util: Don't check for parallel iteration in hash-related     functions. (bsc#1106420)

  - spec: Don't restart libvirt-guests when updating     libvirt-client. (bsc#1104662)

  - Fix virNodeGetSEVInfo API crashing libvirtd on AMD SEV     enabled hosts. (bsc#1108395)

This update was imported from the SUSE:SLE-15:Update update project.

This update for libvirt fixes the following issues :

Security issue fixed :

CVE-2019-3840: Fixed a NULL pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

CVE-2019-3886: Fixed an information leak which allowed to retrieve the guest hostname under readonly mode (bsc#1131595).

Other issues addressed: libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).

conf: added new 'xenbus' controller type

util: skip RDMA detection for non-PCI network devices (bsc#1112182).

qemu: don't use CAP_DAC_OVERRIDE capability if non-root (bsc#1125665).

qemu: fix issues related to restricted permissions on /dev/sev(bsc#1102604).

libxl: save current memory value after successful balloon (bsc#1120813).

libxl: Add support for soft reset. (bsc#1081516)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libvirt provides the following fixes :

Security issue fixed :

CVE-2019-3840: Fixed a NULL pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

Other issues addressed: apparmor: reintroduce upstream lxc mount rules (bsc#1130129).

hook: encode incoming XML to UTF-8 before passing to lxml etree from string method (bsc#1123642).

supportconfig: collect rotated logs in /var/log/libvirt/* (bsc#1124667).

libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).

conf: added new 'xenbus' controller type

util: skip RDMA detection for non-PCI network devices (bsc#1112182).

qemu: don't use CAP_DAC_OVERRIDE capability if non-root (bsc#1125665).

qemu: fix issues related to restricted permissions on /dev/sev(bsc#1102604).

apparmor: add support for named profiles (bsc#1118952).

libxl: save current memory value after successful balloon (bsc#1120813).

apparmor: Fix ptrace rules. (bsc#1117058)

libxl: Add support for soft reset. (bsc#1081516)

libxl: Fix VM migration on busy hosts. (bsc#1108086)

qemu: Add support for SEV guests. (fate#325817)

util: Don't check for parallel iteration in hash-related functions.
(bsc#1106420)

spec: Don't restart libvirt-guests when updating libvirt-client.
(bsc#1104662)

Fix virNodeGetSEVInfo API crashing libvirtd on AMD SEV enabled hosts.
(bsc#1108395)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for libvirt fixes the following issues :

Security issues fixed :

CVE-2019-3840: Fixed a NULL pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

Other issues fixed: libxl: save current memory value after successful balloon (bsc#1120813).

spec: Don't restart libvirt-guests when updating libvirt-client (bsc#1104662).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that libvirt incorrectly handled waiting for certain agent events. An attacker inside a guest could possibly use this issue to cause libvirtd to stop responding, resulting in a denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
180849	Oracle Linux 7 : libvirt (ELSA-2019-2294)	Nessus	Oracle Linux Local Security Checks	medium
131029	Amazon Linux 2 : libvirt (ALAS-2019-1361)	Nessus	Amazon Linux Local Security Checks	medium
129213	EulerOS 2.0 SP3 : libvirt (EulerOS-SA-2019-2020)	Nessus	Huawei Local Security Checks	high
128386	CentOS 7 : libvirt (CESA-2019:2294)	Nessus	CentOS Local Security Checks	medium
128237	Scientific Linux Security Update : libvirt on SL7.x x86_64 (20190806)	Nessus	Scientific Linux Local Security Checks	medium
127708	RHEL 7 : libvirt (RHSA-2019:2294)	Nessus	Red Hat Local Security Checks	medium
126852	EulerOS 2.0 SP2 : libvirt (EulerOS-SA-2019-1724)	Nessus	Huawei Local Security Checks	high
126425	EulerOS 2.0 SP5 : libvirt (EulerOS-SA-2019-1684)	Nessus	Huawei Local Security Checks	medium
126280	EulerOS 2.0 SP8 : libvirt (EulerOS-SA-2019-1653)	Nessus	Huawei Local Security Checks	medium
126198	Photon OS 1.0: Libvirt PHSA-2019-1.0-0237	Nessus	PhotonOS Local Security Checks	medium
124959	EulerOS Virtualization 3.0.1.0 : libvirt (EulerOS-SA-2019-1456)	Nessus	Huawei Local Security Checks	high
124745	EulerOS Virtualization 2.5.3 : libvirt (EulerOS-SA-2019-1367)	Nessus	Huawei Local Security Checks	medium
124402	openSUSE Security Update : libvirt (openSUSE-2019-1294)	Nessus	SuSE Local Security Checks	medium
124361	SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2019:1042-1)	Nessus	SuSE Local Security Checks	medium
124359	openSUSE Security Update : libvirt (openSUSE-2019-1288)	Nessus	SuSE Local Security Checks	medium
124082	SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2019:0948-1)	Nessus	SuSE Local Security Checks	medium
124055	SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2019:0936-1)	Nessus	SuSE Local Security Checks	medium
123780	SUSE SLES12 Security Update : libvirt (SUSE-SU-2019:0553-1)	Nessus	SuSE Local Security Checks	medium
122868	Ubuntu 16.04 LTS / 18.04 LTS : libvirt vulnerability (USN-3909-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

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CVE-2019-3840

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