Xen was updated 4.4.2_01 to address three security issues and functional bugs.

The following vulnerabilities were fixed :

  - Long latency MMIO mapping operations are not preemptible     (XSA-125, CVE-2015-2752, bnc#922705)

  - Unmediated PCI command register access in qemu (XSA-126,     CVE-2015-2756, bnc#922706)

  - Certain domctl operations may be abused to lock up the     host (XSA-127, CVE-2015-2751, bnc#922709)

The update package also includes non-security fixes. See advisory for details.

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.

XEN was updated to fix two security issues and bugs.

Security issues fixed :

  - CVE-2015-3340: Xen did not initialize certain fields,     which allowed certain remote service domains to obtain     sensitive information from memory via a (1)     XEN_DOMCTL_gettscinfo or (2)     XEN_SYSCTL_getdomaininfolist request.

  - CVE-2015-2751: Xen, when using toolstack disaggregation,     allowed remote domains with partial management control     to cause a denial of service (host lock) via unspecified     domctl operations.

  - CVE-2015-2752: The XEN_DOMCTL_memory_mapping hypercall     in Xen, when using a PCI passthrough device, was not     preemptable, which allowed local x86 HVM domain users to     cause a denial of service (host CPU consumption) via a     crafted request to the device model (qemu-dm).

  - CVE-2015-3456: Fixed a buffer overflow in the floppy     drive emulation, which could be used to denial of     service attacks or potential code execution against the     host.

Bugs fixed :

  - xentop: Fix memory leak on read failure

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.

The Xen Project reports :

XSA-77 put the majority of the domctl operations on a list excepting them from having security advisories issued for them if any effects their use might have could hamper security. Subsequently some of them got declared disaggregation safe, but for a small subset this was not really correct: Their (mis-)use may result in host lockups.

As a result, the potential security benefits of toolstack disaggregation are not always fully realised.

Domains deliberately given partial management control may be able to deny service to the entire host.

As a result, in a system designed to enhance security by radically disaggregating the management, the security may be reduced. But, the security will be no worse than a non-disaggregated design.

xen was updated to fix the following security issues :

  - CVE-2015-5165: QEMU leak of uninitialized heap memory in     rtl8139 device model (bsc#939712, XSA-140)

  - CVE-2015-5166: Use after free in QEMU/Xen block unplug     protocol (bsc#939709, XSA-139)

  - CVE-2015-2751: Certain domctl operations could have be     used to lock up the host (bsc#922709, XSA-127)

  - CVE-2015-3259: xl command line config handling stack     overflow (bsc#935634, XSA-137)

  - CVE-2015-4164: DoS through iret hypercall handler     (bsc#932996, XSA-136)

  - CVE-2015-5154: Host code execution via IDE subsystem     CD-ROM (bsc#938344)

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.

The remote host is affected by the vulnerability described in GLSA-201504-04 (Xen: Multiple vulnerabilities)

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

    A local attacker could possibly cause a Denial of Service condition or       obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

Xen was updated to fix eight vulnerabilities.

The following vulnerabilities were fixed :

  - CVE-2015-2751: Certain domctl operations may be abused     to lock up the host (XSA-127 boo#922709)

  - CVE-2015-4103: Potential unintended writes to host MSI     message data field via qemu (XSA-128) (boo#931625)

  - CVE-2015-4104: PCI MSI mask bits inadvertently exposed     to guests (XSA-129) (boo#931626)

  - CVE-2015-4105: Guest triggerable qemu MSI-X pass-through     error messages (XSA-130) (boo#931627)

  - CVE-2015-4106: Unmediated PCI register access in qemu     (XSA-131) (boo#931628)

  - CVE-2015-4163: GNTTABOP_swap_grant_ref operation     misbehavior (XSA-134) (boo#932790)

  - CVE-2015-3209: heap overflow in qemu pcnet controller     allowing guest to host escape (XSA-135) (boo#932770)

  - CVE-2015-4164: DoS through iret hypercall handler     (XSA-136) (boo#932996)

ID	Name	Product	Family	Published	Updated	Severity
83714	SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2015:0701-1)	Nessus	SuSE Local Security Checks	5/20/2015	1/6/2021	high
83757	SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2015:0923-1) (Venom)	Nessus	SuSE Local Security Checks	5/21/2015	9/28/2023	high
84694	FreeBSD : xen-kernel -- Certain domctl operations may be abused to lock up the host (103a47d5-27e7-11e5-a4a5-002590263bf5)	Nessus	FreeBSD Local Security Checks	7/14/2015	1/6/2021	high
85792	SUSE SLED11 Security Update : xen (SUSE-SU-2015:1479-2)	Nessus	SuSE Local Security Checks	9/4/2015	1/6/2021	high
82734	GLSA-201504-04 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	4/13/2015	1/11/2021	high
84334	openSUSE Security Update : xen (openSUSE-2015-435)	Nessus	SuSE Local Security Checks	6/23/2015	1/19/2021	high

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