ID de Prueba:	1.3.6.1.4.1.25623.1.0.71940
Categoría:	Red Hat Local Security Checks
Título:	RedHat Security Advisory RHSA-2012:1129
Resumen:	NOSUMMARY
Descripción:	Description: The remote host is missing updates announced in advisory RHSA-2012:1129. The kernel packages contain the Linux kernel, the core of any Linux operating system. This update fixes the following security issues: * A NULL pointer dereference flaw was found in the nf_ct_frag6_reasm() function in the Linux kernel's netfilter IPv6 connection tracking implementation. A remote attacker could use this flaw to send specially-crafted packets to a target system that is using IPv6 and also has the nf_conntrack_ipv6 kernel module loaded, causing it to crash. (CVE-2012-2744, Important) * A flaw was found in the way the Linux kernel's Event Poll (epoll) subsystem handled large, nested epoll structures. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2011-1083, Moderate) Red Hat would like to thank an anonymous contributor working with the Beyond Security SecuriTeam Secure Disclosure program for reporting CVE-2012-2744, and Nelson Elhage for reporting CVE-2011-1083. This update also fixes the following bugs: * Attempting to turn on Data Center Bridging (DCB) on a port connected to a non-DCB switch port caused the system to become unresponsive or even terminate. This was because napi_poll routines in the ixgbe driver did not end the NAPI when data processing was complete. With this update, the ixgbe napi_poll routines have been fixed so that they now call the napi_complete() function when data processing has finished. This ensures that the NAPI is correctly disabled, and thus prevents possible hangs and crashes in this scenario. (BZ#814454) * If a new file was created on a Network File System version 4 (NFSv4) share, the ownership was set to nfsnobody (-2) until it was possible to upcall to the idmapper. As a consequence, subsequent file system operations could incorrectly use -2 for the user and group IDs for the given file, causing certain operations to fail. In reported cases, this issue also caused Viminfo file is not writable errors for users running Vim with files on an NFSv4 share. (BZ#820962) * Previously, the size of the multicast IGMP (Internet Group Management Protocol) snooping hash table for a bridge was limited to 256 entries even though the maximum is 512. This was due to the hash table size being incorrectly compared to the maximum hash table size, hash_max, and the following message could have been produced by the kernel: Multicast hash table maximum reached, disabling snooping: vnet1, 512 With this update, the hash table value is correctly compared to the hash_max value, and the error message no longer occurs under these circumstances. (BZ#840021) Users should upgrade to these updated packages, which contain backported patches to resolve these issues. The system must be rebooted for this update to take effect. Solution: Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date http://rhn.redhat.com/errata/RHSA-2012-1129.html Risk factor : High
Referencia Cruzada:	Common Vulnerability Exposure (CVE) ID: CVE-2011-1083 43522 http://secunia.com/advisories/43522 48115 http://secunia.com/advisories/48115 48410 http://secunia.com/advisories/48410 48898 http://secunia.com/advisories/48898 48964 http://secunia.com/advisories/48964 71265 http://www.osvdb.org/71265 RHSA-2012:0862 http://rhn.redhat.com/errata/RHSA-2012-0862.html SUSE-SU-2012:0554 http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html SUSE-SU-2012:0616 http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html [linux-kernel] 20110225 [PATCH] optimize epoll loop detection http://article.gmane.org/gmane.linux.kernel/1105744 [linux-kernel] 20110226 Re: [PATCH] optimize epoll loop detection http://article.gmane.org/gmane.linux.kernel/1105888 [linux-kernel] 20110228 Re: [PATCH] optimize epoll loop detection http://article.gmane.org/gmane.linux.kernel/1106686 [oss-security] 20110301 CVE request: kernel: Multiple DoS issues in epoll http://openwall.com/lists/oss-security/2011/03/02/1 [oss-security] 20110302 Re: CVE request: kernel: Multiple DoS issues in epoll http://openwall.com/lists/oss-security/2011/03/02/2 https://bugzilla.redhat.com/show_bug.cgi?id=681578 Common Vulnerability Exposure (CVE) ID: CVE-2012-2744 1027235 http://www.securitytracker.com/id?1027235 49928 http://secunia.com/advisories/49928 54367 http://www.securityfocus.com/bid/54367 RHSA-2012:1064 http://rhn.redhat.com/errata/RHSA-2012-1064.html RHSA-2012:1148 http://rhn.redhat.com/errata/RHSA-2012-1148.html http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=9e2dcf72023d1447f09c47d77c99b0c49659e5ce https://bugzilla.redhat.com/show_bug.cgi?id=833402 https://github.com/torvalds/linux/commit/9e2dcf72023d1447f09c47d77c99b0c49659e5ce
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