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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.1045.2 Xen Security Advisory XSA-101 11 July 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Xen Publisher: Xen Operating System: UNIX variants (UNIX, Linux, OSX) Xen Impact/Access: Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2014-4022 Original Bulletin: http://xenbits.xenproject.org/xsa/advisory-101.html Revision History: July 11 2014: Provide the CVE. June 27 2014: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Xen Security Advisory CVE-2014-4022 / XSA-101 version 3 information leak via gnttab_setup_table on ARM UPDATES IN VERSION 3 ==================== Provide the CVE. ISSUE DESCRIPTION ================= When initialising an internal data structure on ARM platform Xen was not correctly initialising the memory containing the list of a domain's grant table pages. This list is returned by the GNTTABOP_setup_table subhypercall, leading to an information leak. IMPACT ====== Malicious guest administrators can obtain some of the memory contents of other domains: Up to 8*max_nr_grant_frames bytes of uninitialised memory can be leaked to the calling domain. This memory may have been previously used by either the hypervisor or other guests. The default max_nr_grant_frames is 32, hence by default 256 bytes may be leaked in this way. However this can be overridden via the "gnttab_max_nr_frames" hypervisor command line option. VULNERABLE SYSTEMS ================== Both 32- and 64-bit ARM systems are vulnerable from Xen 4.4 onward. MITIGATION ========== None. CREDITS ======= This issue was discovered by Julien Grall. RESOLUTION ========== Applying the attached patch resolves this issue. xsa101.patch xen-unstable, Xen 4.4.x $ sha256sum xsa101*.patch 12ea475265a0804a3a42f620d7065a7408a5ae4b017c871847424c7247c204e9 xsa101.patch $ - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJTsXKlAAoJEIP+FMlX6CvZAXwH/0Km16VstdF5P72chl3u9BsE aWLe8Xdb9lmPXiIWM+q2NN+Jp8tL08Ia4fyD1OC5zJqtf6TReI9qsBkzo2O6EfjF QdTluXrfYgkob0THsDW1Nd86wxy8UBLlz1dwu+jfKkYp9gMQgTtV1NNyrXEOwn1f vepA/V2kOVss7U5+OXqe10HOm+bK4Qs0vYwu1HnG/y6/I39eP2FXw8jMDSB1pKcJ 1/zBll+R+LVXsQbJbKA6vS9RJiOeMXY1b8y6ThduVuW+bq/RydyqoTb25XPqhHcV 6FaDe3JlncXvpJp4OEaAiHPyBqPRvNgr3WWW16lFGTtlLJdc+43/24WkrLfok6o= =srxg - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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 iQIVAwUBU786LhLndAQH1ShLAQKaphAAiOYS7I/3p14ukBdSWKWP5cHp3bg7kRZz +p5unp8nkkL+sRc6LSSAvxe7UzH6RQpiyNou2a7BvVp38sfpVxT58I5p1wZLopMj n5ZbxF1J22yQkyPjxdia7IOKK4anBVjFL5t4ZMk6xfs0N8ZFH/9fwmiLnd7X5UE6 Zoub0XMXbwYg8UE9xEU4j+u55YiNnmtRCrwmvLLSbAVY/wMdQ8iRGjogh5Fx3H5H lDZnOT7R35PMsxSlJQDMr5QhVgqvtCxOgTSOA2RhGBZ8f+uI9xYXwiPpjk2BZJu8 xBm9kJqaq9w2wTb7sm0JOT3LykntKoEgDXG3+PgPfvcTc30ltts4MA1b3inFH6UX lotjLVQXiOffg7Za2YQrr/+tgULuLOrG30K4z1n//a36NUqcV7N59OiG9reWz11Q EX7+C3rY/61g1FbtRY8+xp5Fo35D0TKrgYq+3ylDoFncbF7j1+6D0s6cqpcgLSZF JhYCfaTh/4VRj9rOILZY7Gtkvr9Uk37C5I6GdKCZozOkEJIhFBfcsga4NSObviTB RepSyekogI88KKPDlsgjdwAjiAOs6XrCzx3pYdg2tuXpJKDFc5Dz1yu/j1Arj2Hm cwIRzkjhoXarY4eQyvcIHjQ1Owf6voyQhFi6o7mWOcQoWOrM+xNg9H3+lvNQM6hq D2g96Joy0DA= =M+Gd -----END PGP SIGNATURE-----