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    Debian: DSA-3663-1: xen security update

    Date 09 Sep 2016
    183
    Posted By LinuxSecurity 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
    - -------------------------------------------------------------------------
    
    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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