ALAS-2015-476


Amazon Linux AMI Security Advisory: ALAS-2015-476
Advisory Release Date: 2015-02-11 19:48 Pacific
Severity: Medium

Issue Overview:

The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a "negative groups" issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c. (CVE-2014-8989 )

A flaw was found in the way the Linux kernel's splice() system call validated its parameters. On certain file systems, a local, unprivileged user could use this flaw to write past the maximum file size, and thus crash the system. (CVE-2014-7822 )


Affected Packages:

kernel


Issue Correction:
Run yum clean all followed by yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.

New Packages:
i686:
    perf-debuginfo-3.14.33-26.47.amzn1.i686
    perf-3.14.33-26.47.amzn1.i686
    kernel-tools-debuginfo-3.14.33-26.47.amzn1.i686
    kernel-tools-devel-3.14.33-26.47.amzn1.i686
    kernel-debuginfo-3.14.33-26.47.amzn1.i686
    kernel-debuginfo-common-i686-3.14.33-26.47.amzn1.i686
    kernel-devel-3.14.33-26.47.amzn1.i686
    kernel-headers-3.14.33-26.47.amzn1.i686
    kernel-3.14.33-26.47.amzn1.i686
    kernel-tools-3.14.33-26.47.amzn1.i686

noarch:
    kernel-doc-3.14.33-26.47.amzn1.noarch

src:
    kernel-3.14.33-26.47.amzn1.src

x86_64:
    kernel-devel-3.14.33-26.47.amzn1.x86_64
    kernel-tools-devel-3.14.33-26.47.amzn1.x86_64
    perf-3.14.33-26.47.amzn1.x86_64
    kernel-tools-3.14.33-26.47.amzn1.x86_64
    kernel-3.14.33-26.47.amzn1.x86_64
    kernel-headers-3.14.33-26.47.amzn1.x86_64
    perf-debuginfo-3.14.33-26.47.amzn1.x86_64
    kernel-tools-debuginfo-3.14.33-26.47.amzn1.x86_64
    kernel-debuginfo-3.14.33-26.47.amzn1.x86_64
    kernel-debuginfo-common-x86_64-3.14.33-26.47.amzn1.x86_64