ALAS-2014-289


Amazon Linux AMI Security Advisory: ALAS-2014-289
Advisory Release Date: 2014-09-16 22:32 Pacific
Severity: Medium

Issue Overview:

The pn_recvmsg function in net/phonet/datagram.c in the Linux kernel before 3.12.4 updates a certain length value before ensuring that an associated data structure has been initialized, which allows local users to obtain sensitive information from kernel stack memory via a (1) recvfrom, (2) recvmmsg, or (3) recvmsg system call.

The security_context_to_sid_core function in security/selinux/ss/services.c in the Linux kernel before 3.13.4 allows local users to cause a denial of service (system crash) by leveraging the CAP_MAC_ADMIN capability to set a zero-length security context.

The Linux kernel before 3.12.4 updates certain length values before ensuring that associated data structures have been initialized, which allows local users to obtain sensitive information from kernel stack memory via a (1) recvfrom, (2) recvmmsg, or (3) recvmsg system call, related to net/ipv4/ping.c, net/ipv4/raw.c, net/ipv4/udp.c, net/ipv6/raw.c, and net/ipv6/udp.c.

The cifs_iovec_write function in fs/cifs/file.c in the Linux kernel through 3.13.5 does not properly handle uncached write operations that copy fewer than the requested number of bytes, which allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory corruption and system crash), or possibly gain privileges via a writev system call with a crafted pointer.


Affected Packages:

kernel


Issue Correction:
Run 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:
    kernel-tools-3.4.82-69.112.amzn1.i686
    kernel-tools-debuginfo-3.4.82-69.112.amzn1.i686
    kernel-3.4.82-69.112.amzn1.i686
    kernel-headers-3.4.82-69.112.amzn1.i686
    kernel-debuginfo-common-i686-3.4.82-69.112.amzn1.i686
    kernel-devel-3.4.82-69.112.amzn1.i686
    kernel-debuginfo-3.4.82-69.112.amzn1.i686

noarch:
    kernel-doc-3.4.82-69.112.amzn1.noarch

src:
    kernel-3.4.82-69.112.amzn1.src

x86_64:
    kernel-headers-3.4.82-69.112.amzn1.x86_64
    kernel-3.4.82-69.112.amzn1.x86_64
    kernel-tools-debuginfo-3.4.82-69.112.amzn1.x86_64
    kernel-debuginfo-common-x86_64-3.4.82-69.112.amzn1.x86_64
    kernel-devel-3.4.82-69.112.amzn1.x86_64
    kernel-debuginfo-3.4.82-69.112.amzn1.x86_64
    kernel-tools-3.4.82-69.112.amzn1.x86_64