Date: Wed, 23 Apr 2014 13:05:57 +0000 From: Xen.org security team <security@....org> To: xen-announce@...ts.xen.org, xen-devel@...ts.xen.org, xen-users@...ts.xen.org, oss-security@...ts.openwall.com CC: Xen.org security team <security@....org> Subject: Xen Security Advisory 94 - ARM hypervisor crash on guest interrupt controller access -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Xen Security Advisory XSA-94 ARM hypervisor crash on guest interrupt controller access ISSUE DESCRIPTION ================= When handling a guest access to the virtual GIC distributor (interrupt controller) Xen could dereference a pointer before checking it for validity leading to a hypervisor crash and host Denial of Service. IMPACT ====== A buggy or malicious guest can crash the host. VULNERABLE SYSTEMS ================== Both 32- and 64-bit ARM systems are vulnerable from Xen 4.4 onward. x86 systems are not vulnerable. MITIGATION ========== None. NOTE REGARDING LACK OF EMBARGO ============================== This bug was publicly reported on xen-devel, before it was appreciated that there was a security problem. CREDITS ======= The initial bug was discovered by Thomas Leonard and the security aspect was diagnosed by Julien Grall. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. xsa94.patch xen-unstable, Xen 4.4.x $ sha256sum xsa94*.patch ad0f20577400756a1786daeafef86fa870727ec35b48f71f565e4a30dcbda58d xsa94.patch $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJTV7qTAAoJEIP+FMlX6CvZ08EH/3pIhD1lCXex3pbvo0BFIc2y +XqJmLQ8QVeuk1Q9etEVbJxC8YvbmunefyCyfXIYQpL5jWqJdOAGzSktLOuaGrrM ENG6kFyiC6pxLouJb+BAm3qOfe3vVCdkWh9ouWQGC/3FqbSM+2QGI0vUyxtfmmga IDeQ+CjyWVVhmR7Tb76Gc/pMLnrfD1HTZSgTe8NacqbnZuXzPMrxkKw8BleK/boH L5r/0Y/GqqOe5LRqCOZt8U7jlcfwAs+rqUI0UDz70YvokcBH7RwaRiolZxicLdjP 4lFJH8q9d45EA9JI+Xifv2QZ9tJMRNhRtTQpqIS8swAROOM/SblpPUPlOiPvyaE= =RGUg -----END PGP SIGNATURE----- Download attachment "xsa94.patch" of type "application/octet-stream" (1164 bytes)
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