libvirt 0.7.5 through 1.2.x before 1.2.5 allows local users to cause a denial of service (read block and hang) via a crafted XML document containing an XML external entity declaration in conjunction with an entity reference to the (1) virConnectCompareCPU or (2) virConnectBaselineCPU API method, related to an XML External Entity (XXE) issue. NOTE: this issue was SPLIT per ADT3 due to different affected versions of some vectors. CVE-2014-5177 is used for other API methods.

Updated libvirt packages fix security vulnerabilities :

The LXC driver (lxc/lxc_driver.c) in libvirt 1.0.1 through 1.2.1 allows local users to (1) delete arbitrary host devices via the virDomainDeviceDettach API and a symlink attack on /dev in the container; (2) create arbitrary nodes (mknod) via the virDomainDeviceAttach API and a symlink attack on /dev in the container; and cause a denial of service (shutdown or reboot host OS) via the (3) virDomainShutdown or (4) virDomainReboot API and a symlink attack on /dev/initctl in the container, related to paths under /proc//root and the virInitctlSetRunLevel function (CVE-2013-6456).

libvirt was patched to prevent expansion of entities when parsing XML files. This vulnerability allowed malicious users to read arbitrary files or cause a denial of service (CVE-2014-0179).

An out-of-bounds read flaw was found in the way libvirt's qemuDomainGetBlockIoTune() function looked up the disk index in a non-persistent (live) disk configuration while a persistent disk configuration was being indexed. A remote attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd or, potentially, leak memory from the libvirtd process (CVE-2014-3633).

A denial of service flaw was found in the way libvirt's virConnectListAllDomains() function computed the number of used domains. A remote attacker able to establish a read-only connection to libvirtd could use this flaw to make any domain operations within libvirt unresponsive (CVE-2014-3657).

Eric Blake discovered that libvirt incorrectly handled permissions when processing the qemuDomainFormatXML command. An attacker with read-only privileges could possibly use this to gain access to certain information from the domain xml file (CVE-2014-7823).

The qemuDomainMigratePerform and qemuDomainMigrateFinish2 functions in qemu/qemu_driver.c in libvirt do not unlock the domain when an ACL check fails, which allow local users to cause a denial of service via unspecified vectors (CVE-2014-8136).

The XML getters for for save images and snapshots objects don't check ACLs for the VIR_DOMAIN_XML_SECURE flag and might possibly dump security sensitive information. A remote attacker able to establish a connection to libvirtd could use this flaw to cause leak certain limited information from the domain xml file (CVE-2015-0236).

The remote host is affected by the vulnerability described in GLSA-201412-04 (libvirt: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in libvirt. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker may be able to cause a Denial of Service or cause       information leakage. A local attacker may be able to escalate privileges,       cause a Denial of Service or possibly execute arbitrary code.
  Workaround :

    There is no known workaround at this time.

Daniel P. Berrange and Richard Jones discovered that libvirt incorrectly handled XML documents containing XML external entity declarations. An attacker could use this issue to cause libvirtd to crash, resulting in a denial of service on all affected releases, or possibly read arbitrary files if fine grained access control was enabled on Ubuntu 14.04 LTS. (CVE-2014-0179, CVE-2014-5177)

Luyao Huang discovered that libvirt incorrectly handled certain blkiotune queries. An attacker could use this issue to cause libvirtd to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3633).

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.

Several vulnerabilities were discovered in Libvirt, a virtualisation abstraction library. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2014-0179     Richard Jones and Daniel P. Berrange found that libvirt     passes the XML_PARSE_NOENT flag when parsing XML     documents using the libxml2 library, in which case all     XML entities in the parsed documents are expanded. A     user able to force libvirtd to parse an XML document     with an entity pointing to a special file that blocks on     read access could use this flaw to cause libvirtd to     hang indefinitely, resulting in a denial of service on     the system.

  - CVE-2014-3633     Luyao Huang of Red Hat found that the qemu     implementation of virDomainGetBlockIoTune computed an     index into the array of disks for the live definition,     then used it as the index into the array of disks for     the persistent definition, which could result into an     out-of-bounds read access in qemuDomainGetBlockIoTune().

  A remote attacker able to establish a read-only connection to   libvirtd could use this flaw to crash libvirtd or, potentially, leak   memory from the libvirtd process.

Updated libvirt packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 7.

The Red Hat Security Response Team has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The libvirt library is 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.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a file could use this flaw to read the contents of that file; parsing an XML document with an entity pointing to a special file that blocks on read access could cause libvirtd to hang indefinitely, resulting in a denial of service on the system. (CVE-2014-0179)

Red Hat would like to thank the upstream Libvirt project for reporting this issue. Upstream acknowledges Daniel P. Berrange and Richard Jones as the original reporters.

This update also fixes the following bugs :

* A previous update of the libvirt package introduced an error; a SIG_SETMASK argument was incorrectly replaced by a SIG_BLOCK argument after the poll() system call. Consequently, the SIGCHLD signal could be permanently blocked, which caused signal masks to not return to their original values and defunct processes to be generated. With this update, the original signal masks are restored and defunct processes are no longer generated. (BZ#1112689)

* An attempt to start a domain that did not exist caused network filters to be locked for read-only access. As a consequence, when trying to gain read-write access, a deadlock occurred. This update applies a patch to fix this bug and an attempt to start a non-existent domain no longer causes a deadlock in the described scenario.
(BZ#1112690)

* Previously, the libvirtd daemon was binding only to addresses that were configured on certain network interfaces. When libvirtd started before the IPv4 addresses had been configured, libvirtd listened only on the IPv6 addresses. The daemon has been modified to not require an address to be configured when binding to a wildcard address, such as '0.0.0.0' or '::'. As a result, libvirtd binds to both IPv4 and IPv6 addresses as expected. (BZ#1112692)

Users of libvirt are advised to upgrade to these updated packages, which fix these bugs. After installing the updated packages, libvirtd will be restarted automatically.

From Red Hat Security Advisory 2014:0914 :

Updated libvirt packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 7.

The Red Hat Security Response Team has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The libvirt library is 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.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a file could use this flaw to read the contents of that file; parsing an XML document with an entity pointing to a special file that blocks on read access could cause libvirtd to hang indefinitely, resulting in a denial of service on the system. (CVE-2014-0179)

Red Hat would like to thank the upstream Libvirt project for reporting this issue. Upstream acknowledges Daniel P. Berrange and Richard Jones as the original reporters.

This update also fixes the following bugs :

* A previous update of the libvirt package introduced an error; a SIG_SETMASK argument was incorrectly replaced by a SIG_BLOCK argument after the poll() system call. Consequently, the SIGCHLD signal could be permanently blocked, which caused signal masks to not return to their original values and defunct processes to be generated. With this update, the original signal masks are restored and defunct processes are no longer generated. (BZ#1112689)

* An attempt to start a domain that did not exist caused network filters to be locked for read-only access. As a consequence, when trying to gain read-write access, a deadlock occurred. This update applies a patch to fix this bug and an attempt to start a non-existent domain no longer causes a deadlock in the described scenario.
(BZ#1112690)

* Previously, the libvirtd daemon was binding only to addresses that were configured on certain network interfaces. When libvirtd started before the IPv4 addresses had been configured, libvirtd listened only on the IPv6 addresses. The daemon has been modified to not require an address to be configured when binding to a wildcard address, such as '0.0.0.0' or '::'. As a result, libvirtd binds to both IPv4 and IPv6 addresses as expected. (BZ#1112692)

Users of libvirt are advised to upgrade to these updated packages, which fix these bugs. After installing the updated packages, libvirtd will be restarted automatically.

This update fixes the following issues with libvirt :

  - bnc#875694: Fix migration with QEMU 1.6. QEMU 1.6.0     introduced new migration status: setup. Libvirt does not     expect such string in QMP and refuses to migrate with     error 'unexpected migration status in setup'

  - Patch to prevent expansion of entities when parsing XML     files. This vulnerability allowed malicious users to     read arbitrary files or cause a denial of service     (CVE-2014-0179).

libvirt was patched to prevent expansion of entities when parsing XML files. This vulnerability allowed malicious users to read arbitrary files or cause a denial of service (CVE-2014-0179).

libvirt has been patched to fix two security issues.

Further information is available at http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0179 and http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6456

These security issues have been fixed :

  - Unsafe parsing of XML documents allows arbitrary file     read or denial of service. (CVE-2014-0179)

  - Ability to delete or create arbitrary host devices     (CVE-2013-6456)

Updated libvirt packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The libvirt library is 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.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a special file that blocks on read access could use this flaw to cause libvirtd to hang indefinitely, resulting in a denial of service on the system.
(CVE-2014-0179)

Red Hat would like to thank the upstream Libvirt project for reporting this issue. Upstream acknowledges Daniel P. Berrange and Richard Jones as the original reporters.

This update also fixes the following bugs :

* When hot unplugging a virtual CPU (vCPU), libvirt kept a pointer to already freed memory if the vCPU was pinned to a host CPU.
Consequently, when reading the CPU pinning information, libvirt terminated unexpectedly due to an attempt to access this memory. This update ensures that libvirt releases the pointer to the previously allocated memory when a vCPU is being hot unplugged, and it no longer crashes in this situation. (BZ#1091206)

* Previously, libvirt passed an incorrect argument to the 'tc' command when setting quality of service (QoS) on a network interface controller (NIC). As a consequence, QoS was applied only to IP traffic. With this update, libvirt constructs the 'tc' command correctly so that QoS is applied to all traffic as expected.
(BZ#1096806)

* When using the sanlock daemon for managing access to shared storage, libvirt expected all QEMU domains to be registered with sanlock.
However, if a QEMU domain was started prior to enabling sanlock, the domain was not registered with sanlock. Consequently, migration of a virtual machine (VM) from such a QEMU domain failed with a libvirt error. With this update, libvirt verifies whether a QEMU domain process is registered with sanlock before it starts working with the domain, ensuring that migration of virtual machines works as expected.
(BZ#1097227)

All libvirt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a special file that blocks on read access could use this flaw to cause libvirtd to hang indefinitely, resulting in a denial of service on the system.
(CVE-2014-0179)

This update also fixes the following bugs :

  - When hot unplugging a virtual CPU (vCPU), libvirt kept a     pointer to already freed memory if the vCPU was pinned     to a host CPU. Consequently, when reading the CPU     pinning information, libvirt terminated unexpectedly due     to an attempt to access this memory. This update ensures     that libvirt releases the pointer to the previously     allocated memory when a vCPU is being hot unplugged, and     it no longer crashes in this situation.

  - Previously, libvirt passed an incorrect argument to the     'tc' command when setting quality of service (QoS) on a     network interface controller (NIC). As a consequence,     QoS was applied only to IP traffic. With this update,     libvirt constructs the 'tc' command correctly so that     QoS is applied to all traffic as expected.

  - When using the sanlock daemon for managing access to     shared storage, libvirt expected all QEMU domains to be     registered with sanlock. However, if a QEMU domain was     started prior to enabling sanlock, the domain was not     registered with sanlock. Consequently, migration of a     virtual machine (VM) from such a QEMU domain failed with     a libvirt error. With this update, libvirt verifies     whether a QEMU domain process is registered with sanlock     before it starts working with the domain, ensuring that     migration of virtual machines works as expected.

After installing the updated packages, libvirtd will be restarted automatically.

From Red Hat Security Advisory 2014:0560 :

Updated libvirt packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The libvirt library is 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.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a special file that blocks on read access could use this flaw to cause libvirtd to hang indefinitely, resulting in a denial of service on the system.
(CVE-2014-0179)

Red Hat would like to thank the upstream Libvirt project for reporting this issue. Upstream acknowledges Daniel P. Berrange and Richard Jones as the original reporters.

This update also fixes the following bugs :

* When hot unplugging a virtual CPU (vCPU), libvirt kept a pointer to already freed memory if the vCPU was pinned to a host CPU.
Consequently, when reading the CPU pinning information, libvirt terminated unexpectedly due to an attempt to access this memory. This update ensures that libvirt releases the pointer to the previously allocated memory when a vCPU is being hot unplugged, and it no longer crashes in this situation. (BZ#1091206)

* Previously, libvirt passed an incorrect argument to the 'tc' command when setting quality of service (QoS) on a network interface controller (NIC). As a consequence, QoS was applied only to IP traffic. With this update, libvirt constructs the 'tc' command correctly so that QoS is applied to all traffic as expected.
(BZ#1096806)

* When using the sanlock daemon for managing access to shared storage, libvirt expected all QEMU domains to be registered with sanlock.
However, if a QEMU domain was started prior to enabling sanlock, the domain was not registered with sanlock. Consequently, migration of a virtual machine (VM) from such a QEMU domain failed with a libvirt error. With this update, libvirt verifies whether a QEMU domain process is registered with sanlock before it starts working with the domain, ensuring that migration of virtual machines works as expected.
(BZ#1097227)

All libvirt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.

- Fix xen hvm VNC port (bz #1094262)

    - CVE-2014-0179: Unsafe XML parsing (bz #1094792, bz       #1088290)

    - Fix failure to start xen instances (rackspace in       particular) (bz #1098376)

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

Multiple vulnerabilities has been discovered and corrected in libvirt :

The LXC driver (lxc/lxc_driver.c) in libvirt 1.0.1 through 1.2.1 allows local users to (1) delete arbitrary host devices via the virDomainDeviceDettach API and a symlink attack on /dev in the container; (2) create arbitrary nodes (mknod) via the virDomainDeviceAttach API and a symlink attack on /dev in the container; and cause a denial of service (shutdown or reboot host OS) via the (3) virDomainShutdown or (4) virDomainReboot API and a symlink attack on /dev/initctl in the container, related to paths under /proc//root and the virInitctlSetRunLevel function (CVE-2013-6456).

libvirt was patched to prevent expansion of entities when parsing XML files. This vulnerability allowed malicious users to read arbitrary files or cause a denial of service (CVE-2014-0179).

The updated packages have been upgraded to the 1.1.3.5 version and patched to correct these issues.

ID	Name	Product	Family	Severity
82368	Mandriva Linux Security Advisory : libvirt (MDVSA-2015:115)	Nessus	Mandriva Local Security Checks	medium
79814	GLSA-201412-04 : libvirt: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
78010	Ubuntu 14.04 LTS : libvirt vulnerabilities (USN-2366-1)	Nessus	Ubuntu Local Security Checks	high
77921	Debian DSA-3038-1 : libvirt - security update	Nessus	Debian Local Security Checks	medium
76904	RHEL 7 : libvirt (RHSA-2014:0914)	Nessus	Red Hat Local Security Checks	low
76741	Oracle Linux 7 : libvirt (ELSA-2014-0914)	Nessus	Oracle Linux Local Security Checks	low
76684	CentOS 7 : libvirt (CESA-2014:0914)	Nessus	CentOS Local Security Checks	low
75362	openSUSE Security Update : libvirt (openSUSE-SU-2014:0674-1)	Nessus	SuSE Local Security Checks	low
75359	openSUSE Security Update : libvirt (openSUSE-SU-2014:0650-1)	Nessus	SuSE Local Security Checks	low
74507	SuSE 11.3 Security Update : libvirt (SAT Patch Number 9203)	Nessus	SuSE Local Security Checks	medium
74226	CentOS 6 : libvirt (CESA-2014:0560)	Nessus	CentOS Local Security Checks	low
74209	Scientific Linux Security Update : libvirt on SL6.x i386/x86_64 (20140527)	Nessus	Scientific Linux Local Security Checks	low
74204	RHEL 6 : libvirt (RHSA-2014:0560)	Nessus	Red Hat Local Security Checks	low
74202	Oracle Linux 6 : libvirt (ELSA-2014-0560)	Nessus	Oracle Linux Local Security Checks	low
74175	Fedora 20 : libvirt-1.1.3.5-2.fc20 (2014-6586)	Nessus	Fedora Local Security Checks	low
74075	Mandriva Linux Security Advisory : libvirt (MDVSA-2014:097)	Nessus	Mandriva Local Security Checks	medium

Detections

Analytics

CVE-2014-0179

critical

Tenable Plugins

medium

high

high

medium

low

low

low

low

low

medium

low

low

low

low

low

medium