Information leak through XEN_DOMCTL_gettscinfo [XSA-132,CVE-2015-3340]

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.

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 :

The handler for XEN_DOMCTL_gettscinfo failed to initialize a padding field subsequently copied to guest memory.

A similar leak existed in XEN_SYSCTL_getdomaininfolist, which is being addressed here regardless of that operation being declared unsafe for disaggregation by XSA-77.

Malicious or buggy stub domain kernels or tool stacks otherwise living outside of Domain0 may be able to read sensitive data relating to the hypervisor or other guests not under the control of that domain.

Xen was updated to fix two security issues and a bug :

CVE-2015-3456: A buffer overflow in the floppy drive emulation, which could be used to carry out denial of service attacks or potential code execution against the host. This vulnerability is also known as VENOM.

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.

An exception in setCPUAffinity when restoring guests. (bsc#910441)

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 hypervisor was updated to fix two security issues :

  - 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.
    (CVE-2015-3456)

  - 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-2015-3340)

The remote host is affected by the vulnerability described in GLSA-201604-03 (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.

ID	名稱	產品	系列	已發布	已更新	嚴重性
83207	Fedora 21 : xen-4.4.2-3.fc21 (2015-6670)	Nessus	Fedora Local Security Checks	2015/5/4	2021/1/11	low
83757	SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2015:0923-1) (Venom)	Nessus	SuSE Local Security Checks	2015/5/21	2023/9/28	high
84714	FreeBSD : xen-kernel -- Information leak through XEN_DOMCTL_gettscinfo (ce658051-27ea-11e5-a4a5-002590263bf5)	Nessus	FreeBSD Local Security Checks	2015/7/14	2021/1/6	low
83859	SUSE SLES11 Security Update : Xen (SUSE-SU-2015:0944-1) (Venom)	Nessus	SuSE Local Security Checks	2015/5/27	2021/1/19	high
83965	openSUSE Security Update : xen (openSUSE-2015-391) (Venom)	Nessus	SuSE Local Security Checks	2015/6/3	2021/1/19	high
90380	GLSA-201604-03 : Xen: Multiple vulnerabilities (Venom)	Nessus	Gentoo Local Security Checks	2016/4/7	2021/1/11	critical

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