ID de Prueba:	1.3.6.1.4.1.25623.1.0.870752
Categoría:	Red Hat Local Security Checks
Título:	RedHat Update for kernel RHSA-2012:0721-01
Resumen:	The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
Descripción:	Summary: The remote host is missing an update for the 'kernel' package(s) announced via the referenced advisory. Vulnerability Insight: The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * It was found that the Xen hypervisor implementation as shipped with Red Hat Enterprise Linux 5 did not properly restrict the syscall return addresses in the sysret return path to canonical addresses. An unprivileged user in a 64-bit para-virtualized guest, that is running on a 64-bit host that has an Intel CPU, could use this flaw to crash the host or, potentially, escalate their privileges, allowing them to execute arbitrary code at the hypervisor level. (CVE-2012-0217, Important) * It was found that guests could trigger a bug in earlier AMD CPUs, leading to a CPU hard lockup, when running on the Xen hypervisor implementation. An unprivileged user in a 64-bit para-virtualized guest could use this flaw to crash the host. Warning: After installing this update, hosts that are using an affected AMD CPU (refer to Red Hat Bugzilla bug #824966 for a list) will fail to boot. In order to boot such hosts, the new kernel parameter, allow_unsafe, can be used ('allow_unsafe=on'). This option should only be used with hosts that are running trusted guests, as setting it to 'on' reintroduces the flaw (allowing guests to crash the host). (CVE-2012-2934, Moderate) Note: For Red Hat Enterprise Linux guests, only privileged guest users can exploit the CVE-2012-0217 and CVE-2012-2934 issues. Red Hat would like to thank the Xen project for reporting these issues. Upstream acknowledges Rafal Wojtczuk as the original reporter of CVE-2012-0217. Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect. Affected Software/OS: kernel on Red Hat Enterprise Linux (v. 5 server) Solution: Please Install the Updated Packages. CVSS Score: 7.2 CVSS Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Referencia Cruzada:	Common Vulnerability Exposure (CVE) ID: CVE-2012-0217 Cert/CC Advisory: TA12-164A http://www.us-cert.gov/cas/techalerts/TA12-164A.html CERT/CC vulnerability note: VU#649219 http://www.kb.cert.org/vuls/id/649219 Debian Security Information: DSA-2501 (Google Search) http://www.debian.org/security/2012/dsa-2501 Debian Security Information: DSA-2508 (Google Search) http://www.debian.org/security/2012/dsa-2508 https://www.exploit-db.com/exploits/28718/ https://www.exploit-db.com/exploits/46508/ FreeBSD Security Advisory: FreeBSD-SA-12:04 http://security.freebsd.org/advisories/FreeBSD-SA-12:04.sysret.asc http://security.gentoo.org/glsa/glsa-201309-24.xml http://www.mandriva.com/security/advisories?name=MDVSA-2013:150 http://lists.xen.org/archives/html/xen-announce/2012-06/msg00001.html http://lists.xen.org/archives/html/xen-devel/2012-06/msg01072.html Microsoft Security Bulletin: MS12-042 https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-042 NETBSD Security Advisory: NetBSD-SA2012-003 http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2012-003.txt.asc https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15596 http://secunia.com/advisories/55082 Common Vulnerability Exposure (CVE) ID: CVE-2012-2934 BugTraq ID: 53961 http://www.securityfocus.com/bid/53961 http://support.amd.com/us/Processor_TechDocs/25759.pdf http://lists.xen.org/archives/html/xen-announce/2012-06/msg00002.html http://secunia.com/advisories/51413 SuSE Security Announcement: openSUSE-SU-2012:1572 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html SuSE Security Announcement: openSUSE-SU-2012:1573 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
Copyright	Copyright (c) 2012 Greenbone Networks GmbH

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