Debian: DSA-3663-1: xen security update

    Date09 Sep 2016
    CategoryDebian
    81
    Posted ByLinuxSecurity Advisories
    Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3663-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    September 09, 2016                    https://www.debian.org/security/faq
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    Package        : xen
    CVE ID         : CVE-2016-7092 CVE-2016-7094 CVE-2016-7154
    
    Multiple vulnerabilities have been discovered in the Xen hypervisor. The
    Common Vulnerabilities and Exposures project identifies the following
    problems:
    
    CVE-2016-7092 (XSA-185)
    
        Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba
        discovered a flaw in the handling of L3 pagetable entries, allowing
        a malicious 32-bit PV guest administrator can escalate their
        privilege to that of the host.
    
    CVE-2016-7094 (XSA-187)
    
        x86 HVM guests running with shadow paging use a subset of the x86
        emulator to handle the guest writing to its own pagetables. Andrew
        Cooper of Citrix discovered that there are situations a guest can
        provoke which result in exceeding the space allocated for internal
        state. A malicious HVM guest administrator can cause Xen to fail a
        bug check, causing a denial of service to the host.
    
    CVE-2016-7154 (XSA-188)
    
        Mikhail Gorobets of Advanced Threat Research, Intel Security
        discovered a use after free flaw in the FIFO event channel code. A
        malicious guest administrator can crash the host, leading to a
        denial of service. Arbitrary code execution (and therefore privilege
        escalation), and information leaks, cannot be excluded.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 4.4.1-9+deb8u7.
    
    We recommend that you upgrade your xen packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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