Test ID:	1.3.6.1.4.1.25623.1.0.71904
Category:	Red Hat Local Security Checks
Title:	RedHat Security Advisory RHSA-2011:1813
Summary:	NOSUMMARY
Description:	Description: The remote host is missing updates announced in advisory RHSA-2011:1813. These packages contain the Linux kernel. This update fixes the following security issues: * A flaw in the Stream Control Transmission Protocol (SCTP) implementation could allow a remote attacker to cause a denial of service by sending a specially-crafted SCTP packet to a target system. (CVE-2011-2482, Important) If you do not run applications that use SCTP, you can prevent the sctp module from being loaded by adding the following to the end of the /etc/modprobe.d/blacklist.conf file: blacklist sctp This way, the sctp module cannot be loaded accidentally, which may occur if an application that requires SCTP is started. A reboot is not necessary for this change to take effect. * A flaw in the client-side NFS Lock Manager (NLM) implementation could allow a local, unprivileged user to cause a denial of service. (CVE-2011-2491, Important) * Flaws in the netlink-based wireless configuration interface could allow a local user, who has the CAP_NET_ADMIN capability, to cause a denial of service or escalate their privileges on systems that have an active wireless interface. (CVE-2011-2517, Important) * A flaw was found in the way the Linux kernel's Xen hypervisor implementation emulated the SAHF instruction. When using a fully-virtualized guest on a host that does not use hardware assisted paging (HAP), such as those running CPUs that do not have support for (or those that have it disabled) Intel Extended Page Tables (EPT) or AMD Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), a privileged guest user could trigger this flaw to cause the hypervisor to crash. (CVE-2011-2519, Moderate) * A flaw in the __addr_ok() macro in the Linux kernel's Xen hypervisor implementation when running on 64-bit systems could allow a privileged guest user to crash the hypervisor. (CVE-2011-2901, Moderate) * /proc/[PID]/io is world-readable by default. Previously, these files could be read without any further restrictions. A local, unprivileged user could read these files, belonging to other, possibly privileged processes to gather confidential information, such as the length of a password used in a process. (CVE-2011-2495, Low) Red Hat would like to thank Vasily Averin for reporting CVE-2011-2491, and Vasiliy Kulikov of Openwall for reporting CVE-2011-2495. This update also fixes the following bugs: * On Broadcom PCI cards that use the tg3 driver, the operational state of a network device, represented by the value in /sys/class/net/ethX/operstate, was not initialized by default. Consequently, the state was reported as unknown when the tg3 network device was actually in the up state. This update modifies the tg3 driver to properly set the operstate value. (BZ#744699) * A KVM (Kernel-based Virtual Machine) guest can get preempted by the host, when a higher priority process needs to run. When a guest is not running for several timer interrupts in a row, ticks could be lost, resulting in the jiffies timer advancing slower than expected and timeouts taking longer than expected. To correct for the issue of lost ticks, do_timer_tsc_timekeeping() checks a reference clock source (kvm-clock when running as a KVM guest) to see if timer interrupts have been missed. If so, jiffies is incremented by the number of missed timer interrupts, ensuring that programs are woken up on time. (BZ#747874) * When a block device object was allocated, the bd_super field was not being explicitly initialized to NULL. Previously, users of the block device object could set bd_super to NULL when the object was released by calling the kill_block_super() function. Certain third-party file systems do not always use this function, and bd_super could therefore become uninitialized when the object was allocated again. This could cause a kernel panic in the blkdev_releasepage() function, when the uninitialized bd_super field was dereferenced. Now, bd_super is properly initialized in the bdget() function, and the kernel panic no longer occurs. (BZ#751137) 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-2011-1813.html Risk factor : High
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2011-2482 RHSA-2011:1212 http://rhn.redhat.com/errata/RHSA-2011-1212.html [oss-security] 20110830 kernel: CVE-2011-2482/2519 http://www.openwall.com/lists/oss-security/2011/08/30/1 http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=ea2bc483ff5caada7c4aa0d5fbf87d3a6590273d https://bugzilla.redhat.com/show_bug.cgi?id=714867 https://github.com/torvalds/linux/commit/ea2bc483ff5caada7c4aa0d5fbf87d3a6590273d Common Vulnerability Exposure (CVE) ID: CVE-2011-2491 [oss-security] 20110623 Re: CVE request: kernel: NLM: Don't hang forever on NLM unlock requests http://www.openwall.com/lists/oss-security/2011/06/23/6 http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0b760113a3a155269a3fba93a409c640031dd68f https://bugzilla.redhat.com/show_bug.cgi?id=709393 https://github.com/torvalds/linux/commit/0b760113a3a155269a3fba93a409c640031dd68f Common Vulnerability Exposure (CVE) ID: CVE-2011-2495 [oss-security] 20110627 Re: CVE request: kernel: taskstats/procfs io infoleak http://www.openwall.com/lists/oss-security/2011/06/27/1 http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=1d1221f375c94ef961ba8574ac4f85c8870ddd51 https://bugzilla.redhat.com/show_bug.cgi?id=716825 https://github.com/torvalds/linux/commit/1d1221f375c94ef961ba8574ac4f85c8870ddd51 Common Vulnerability Exposure (CVE) ID: CVE-2011-2517 [oss-security] 20110701 Re: CVE request: kernel: nl80211: missing check for valid SSID size in scan operations http://www.openwall.com/lists/oss-security/2011/07/01/4 http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.2 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=208c72f4fe44fe09577e7975ba0e7fa0278f3d03 https://bugzilla.redhat.com/show_bug.cgi?id=718152 https://github.com/torvalds/linux/commit/208c72f4fe44fe09577e7975ba0e7fa0278f3d03 Common Vulnerability Exposure (CVE) ID: CVE-2011-2519 [oss-security] 20130830 kernel: CVE-2011-2482/2519 http://xenbits.xen.org/hg/xen-3.1-testing.hg/rev/15644 https://bugzilla.redhat.com/show_bug.cgi?id=718882 Common Vulnerability Exposure (CVE) ID: CVE-2011-2901 55082 http://secunia.com/advisories/55082 GLSA-201309-24 http://security.gentoo.org/glsa/glsa-201309-24.xml [oss-security] 20110902 Xen Security Advisory 4 (CVE-2011-2901) - Xen 3.3 vaddr validation http://www.openwall.com/lists/oss-security/2011/09/02/2 https://bugzilla.redhat.com/show_bug.cgi?id=728042
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