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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2118 xen security update 12 September 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: xen Publisher: Debian Operating System: Debian GNU/Linux 8 Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-7154 CVE-2016-7094 CVE-2016-7092 Reference: ESB-2016.2117 Original Bulletin: http://www.debian.org/security/2016/dsa-3663 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - - ------------------------------------------------------------------------- Debian Security Advisory DSA-3663-1 security@debian.org 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: debian-security-announce@lists.debian.org - -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJX0kg2AAoJEAVMuPMTQ89EAG0P/0fZID2dOBod15r0GoN28Y7L qFx1Yx3+ZJi/SEq1IVZQQczXCSz19EVe0s+nzcFzsaS5RStoHtUy2DZygjSV+lHU asmfwZgrWeaQejDfo6F8rihXbLCU+cD+R5YUWUODiA6z0NClYHxWu6IgZPPVPRJm vgoPUlSgZRBn/4P5WaLk3rjflMynxbmuLpPOiBxue1ZNzRy4N5rr2w8mGI5Wf0vq MdLkIROy5F3GJvZ30uO4ca4U6fUN49pJ3CE+YefQDsav7MyD9o3wA+94bQ7oFXgj +65QZLtKPhPYX0m3pFwmfuiQCupzog1B9o33eYyBAUV6i2JRS4FQ4ciKujBj+tNC KD1agKNRgXFKgr2itDKlmMgajrACKS1vVnVJrRwlWyX0kegeH61UQFKu7oiWtzl+ WO853HRFaIQFOwrFEPv0KWKzA4zrmz7FXjqSG/yvJAeDenLbODclJlgn4Sei68oI G4nZNPc9Lkfq2xK2UY0FsNKmf1cg92423raKzDhXZbSXl4BVa83d3ZaFCehKrQVO MCDytLw0OudR0aa1kT4O11mwPVLtz2GzxtNv+GVzcsBDoyBvZSyWt8RO6bBDSfiA FYvRvd19L7GQmRoQGdwS2v+2AdU+P4LvZe7NXBXXaW6KWkXccWlk4zd60a2b+FyO GqVKO5POhzy86ToQ5Nho =rOCc - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBV9YTSYx+lLeg9Ub1AQh/Qg/+OOH7BwpYG5x5blY6Vl/0meglNImH9APf N1nkAZpKRmTslHNsv3FRdpeZNdye8yRcPDq4ZbM1o9wxwtYA3mHEYj5HL10YN5xt K8aFtN3QyXO55aIsthLAKuSb6cG37YAYjHlJ4VtoPxBeg8X7kPdBCNShTV/Qxbis zUZx6VHGLF/1R5AEt+/okc0oeOA025p3tvLrfc6reMQAT/zD1Xd/rDVdxq5wDBqI QReFinqZDRHR/d+A89U56bRs2RL/qlvwG9eDJzbG98UWk0l8CsJ6VHhFRjOY8Ghn 65zCB1qm45HcZNaahP7HvYt1h4Izt6xdHz/+sji8MTF0mhO0X0fEvGncc5vjDR/A tXhg77f7TVqkJ3zTqCyn2B8zqbe+/Gsvkz5TexbUicfIGei24xtoyr5+gz4Lw1bM 693VD3YpLOWBwpl2AUylKfwZ8XogD9Mujkr5u4/3xbUFfIvWtSV8MIqbKFfpcrZR M3DdB4Z2dG76fGsIw+E9uyf1u7Kzv9WelAMV09mebdKf/Pobpw7IIdch03Z9oESh LDvNJTNCOgPsDWus7/0qi5AfQ09cWWnxLZUNkS15d1QF/BH3EujA1CNNUGdrXZpD bS5kp8T4HI62aoHkqS43gOA8y/5DU3zYqfvIRAoe6jG0iMoQW/XpUuKQ6hOwO03O aE1MwqmB1r0= =bzE5 -----END PGP SIGNATURE-----