Red Hat Security Advisory 2017-0817-01 – The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: It was discovered that a remote attacker could leverage the generation of IPv6 atomic fragments to trigger the use of fragmentation in an arbitrary IPv6 flow and could subsequently perform any type of a fragmentation-based attack against legacy IPv6 nodes that do not implement RFC6946.

Ubuntu Security Notice 3239-1 – It was discovered that the GNU C Library incorrectly handled the strxfrm function. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. It was discovered that an integer overflow existed in the _IO_wstr_overflow function of the GNU C Library. An attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Various other issues were also addressed.

Red Hat Security Advisory 2017-0564-01 – The libguestfs packages contain a library, which is used for accessing and modifying virtual machine disk images. Security Fix: An integer conversion flaw was found in the way OCaml’s String handled its length. Certain operations on an excessively long String could trigger a buffer overflow or result in an information leak. Note: The libguestfs packages in this advisory were rebuilt with a fixed version of OCaml to address this issue.

Red Hat Security Advisory 2017-0565-01 – OCaml is a high-level, strongly-typed, functional, and object-oriented programming language from the ML family of languages. The ocaml packages contain two batch compilers, an interactive top level system, parsing tools, a replay debugger, a documentation generator, and a comprehensive library. Security Fix: An integer conversion flaw was found in the way OCaml’s String handled its length. Certain operations on an excessively long String could trigger a buffer overflow or result in an information leak.

Red Hat Security Advisory 2017-0574-01 – The gnutls packages provide the GNU Transport Layer Security library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS. The following packages have been upgraded to a later upstream version: gnutls. Security Fix: A denial of service flaw was found in the way the TLS/SSL protocol defined processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make a TLS/SSL server consume an excessive amount of CPU and fail to accept connections form other clients.

Red Hat Security Advisory 2017-0621-01 – Kernel-based Virtual Machine is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM. Security Fix: An integer overflow flaw and an out-of-bounds read flaw were found in the way QEMU’s VGA emulator set certain VGA registers while in VBE mode. A privileged guest user could use this flaw to crash the QEMU process instance.

Red Hat Security Advisory 2017-0680-01 – The glibc packages provide the standard C libraries, POSIX thread libraries, standard math libraries, and the name service cache daemon used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. Security Fix: A stack overflow vulnerability was found in nan* functions that could cause applications, which process long strings with the nan function, to crash or, potentially, execute arbitrary code.

Red Hat Security Advisory 2017-0698-01 – The subscription-manager packages provide programs and libraries to allow users to manage subscriptions and yum repositories from the Red Hat entitlement platform. The subscription-manager-migration-data package provides certificates for migrating a system from the legacy Red Hat Network Classic to Red Hat Subscription Management. The python-rhsm packages provide a library for communicating with the representational state transfer interface of a Red Hat Unified Entitlement Platform. The Subscription Management tools use this interface to manage system entitlements, certificates, and access to content.

Red Hat Security Advisory 2017-0725-01 – The bash packages provide Bash, which is the default shell for Red Hat Enterprise Linux. Security Fix: An arbitrary command injection flaw was found in the way bash processed the hostname value. A malicious DHCP server could use this flaw to execute arbitrary commands on the DHCP client machines running bash under specific circumstances. An arbitrary command injection flaw was found in the way bash processed the SHELLOPTS and PS4 environment variables. A local, authenticated attacker could use this flaw to exploit poorly written setuid programs to elevate their privileges under certain circumstances.

Red Hat Security Advisory 2017-0744-01 – Samba is an open-source implementation of the Server Message Block or Common Internet File System protocol, which allows PC-compatible machines to share files, printers, and other information. Security Fix: It was found that Samba always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users.