Arch Linux Security Advisory ASA-201507-21 ========================================== Severity: Critical Date : 2015-07-29 CVE-ID : CVE-2015-3214 CVE-2015-5154 CVE-2015-5158 Package : qemu Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package qemu before version 2.3.0-5 is vulnerable to multiple issues including arbitrary code execution, information disclosure and denial of service. Resolution ========== Upgrade to 2.3.0-5. # pacman -Syu "qemu>=2.3.0-5" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2015-3214 (information disclosure, arbitrary code execution) An out-of-bounds memory access flaw, leading to memory corruption or possibly an information leak, was found in QEMU's pit_ioport_read() function. A privileged guest user in a QEMU guest, which had QEMU PIT emulation enabled, could potentially, in rare cases, use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process. - CVE-2015-5154 (arbitrary code execution) A heap overflow flaw was found in the way QEMU's IDE subsystem handled I/O buffer access while processing certain ATAPI commands. A privileged guest user in a guest with CDROM drive enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. - CVE-2015-5158 (denial of service) This is a guest-triggerable buffer overflow. The scsi_cdb_length returns -1 as an error value, but the caller does not check it. Luckily, the massive overflow means that QEMU will just SIGSEGV, leading to denial of service of the guest system. Impact ====== A remote attacker is able to execute arbitrary code and take over the qemu process elevating its privilege to that of the qemu process or perform a denial of service attack to crash the guest system. References ========== http://xenbits.xen.org/xsa/advisory-138.html https://access.redhat.com/security/cve/CVE-2015-3214 https://access.redhat.com/security/cve/CVE-2015-5154 https://access.redhat.com/security/cve/CVE-2015-5158 https://github.com/qemu/qemu/commit/d4862a87e31a https://github.com/qemu/qemu/commit/c170aad8b057 https://github.com/qemu/qemu/commit/d2ff85854512 https://github.com/qemu/qemu/commit/cb72cba83021 https://github.com/qemu/qemu/commit/03441c3a4a42