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Scientific Linux SL5.x SLSA-2016:2124-1 Important: Kernel Escalation Risks

Important: kernel security and bug fix update. Date: Fri, 28 Oct 2016 15:55:02 -0000 Reply-To: scientific-linux-users@ Sender: Security Errata for Scientific Linux From: Pat Riehecky Subject: Security ERRATA Important: kernel on SL5.x i386/x86_64 MIME-Version: 1.0 Message-ID: Synopsis: Important: kernel security and bug fix update Advisory ID: SLSA-2016:2124-1 Issue Date: 2016-10-28 CVE Numbers: CVE-2016-5195 CVE-2016-1583 -- Security Fix(es): * A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system. (CVE-2016-5195, Important) * It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system. (CVE-2016-1583, Important) Bug Fix(es): * In some cases, a kernel crash or file system corruption occurred when running journal mode 'ordered'. The kernel crash was caused by a null pointer dereference due to a race condition between two journal functions. The file system corruption occurred due to a race condition between the do_get_write_access() function and buffer writeout. This update fixes both race conditions. As a result, neither the kernel crash, nor the file system corruption now occur. * Prior to this update, some Global File System 2 (GFS2) files had incorrect time stamp values due to two problems with handling time stamps of such files. The first problem concerned the atime time stamp, which ended up with an arbitrary value ahead of the actual value, when a GFS2 file was accessed. The second problem was related to the mtime and ctime time stamp updates, which got lost when aGFS2 file was written to from one node and read from or written to from another node. With this update, a set of patches has been applied that fix these problems. As a result, the time stamps of GFS2 files are now handled correctly. -- SL5 x86_64 kernel-2.6.18-416.el5.x86_64.rpm kernel-debug-2.6.18-416.el5.x86_64.rpm kernel-debug-debuginfo-2.6.18-416.el5.x86_64.rpm kernel-debug-devel-2.6.18-416.el5.x86_64.rpm kernel-debuginfo-2.6.18-416.el5.x86_64.rpm kernel-debuginfo-common-2.6.18-416.el5.x86_64.rpm kernel-devel-2.6.18-416.el5.x86_64.rpm kernel-headers-2.6.18-416.el5.x86_64.rpm kernel-xen-2.6.18-416.el5.x86_64.rpm kernel-xen-debuginfo-2.6.18-416.el5.x86_64.rpm kernel-xen-devel-2.6.18-416.el5.x86_64.rpm i386 kernel-2.6.18-416.el5.i686.rpm kernel-PAE-2.6.18-416.el5.i686.rpm kernel-PAE-debuginfo-2.6.18-416.el5.i686.rpm kernel-PAE-devel-2.6.18-416.el5.i686.rpm kernel-debug-2.6.18-416.el5.i686.rpm kernel-debug-debuginfo-2.6.18-416.el5.i686.rpm kernel-debug-devel-2.6.18-416.el5.i686.rpm kernel-debuginfo-2.6.18-416.el5.i686.rpm kernel-debuginfo-common-2.6.18-416.el5.i686.rpm kernel-devel-2.6.18-416.el5.i686.rpm kernel-headers-2.6.18-416.el5.i386.rpm kernel-xen-2.6.18-416.el5.i686.rpm kernel-xen-debuginfo-2.6.18-416.el5.i686.rpm kernel-xen-devel-2.6.18-416.el5.i686.rpm noarch kernel-doc-2.6.18-416.el5.noarch.rpm - Scientific Linux Development Team lastline . System software patch addressing urgent vulnerabilities in Scientific Linux SL5.x to safeguard against unauthorized access escalation.. Scientific Linux, kernel update, security advisory, privilege escalation, memory issues. . Severity: Important. LinuxSecurity.com Team

Oct 28, 2016 •Important Scientific Linux