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Fedora Update Notification
FEDORA-2018-8e27ad96ed
2018-01-23 21:16:49.691231
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Name        : glibc
Product     : Fedora 26
Version     : 2.25
Release     : 13.fc26
URL         : http://www.gnu.org/software/glibc/
Summary     : The GNU libc libraries
Description :
The glibc package contains standard libraries which are used by
multiple programs on the system. In order to save disk space and
memory, as well as to make upgrading easier, common system code is
kept in one place and shared between programs. This particular package
contains the most important sets of shared libraries: the standard C
library and the standard math library. Without these two libraries, a
Linux system will not function.

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Update Information:

This update addresses two security vulnerabilities:  *  CVE-2017-15670,
CVE-2017-15671, CVE-2017-15804: Various vulnerabilities could lead to memory
corruption in the `glob` and `glob64` function. (RHBZ#1505298, RHBZ##1504807) *
CVE-2017-16997: Check for empty tokens before dynamic string token expansion in
the dynamic linker, so that pre-existing privileged programs with `$ORIGIN`
rpaths/runpaths do not cause the dynamic linker to search the current
 directory,
potentially leading to privilege escalation.  (RHBZ#1526866). *
CVE-2018-1000001: `getcwd` would sometimes return a non-absolute path,
 confusing
the `realpath` function, leading to privilege escalation in conjunction with
user namespaces. (RHBZ#1533837)   In addition, this update replaces the dynamic
linker trampoline on x86-64 with a version which uses the `XSAVE` instruction
 if
it is available. This improves compatibility with future hardware and compilers
which do not follow the x86-64 ABI.  This update also adjusts the thread stack
size accounting to provide additional stack space compared to previous glibc
versions (to avoid introducing RHBZ#1527887).
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References:

  [ 1 ] Bug #1533837 - CVE-2018-1000001 glibc: realpath() buffer underflow when
 getcwd() returns relative path allows privilege escalation [fedora-all]
        https://bugzilla.redhat.com/show_bug.cgi?id=1533837
  [ 2 ] Bug #1526866 - CVE-2017-16997 glibc: Incorrect handling of RPATH in
 elf/dl-load.c can be used to execute code loaded from arbitrary libraries [fedora-all]
        https://bugzilla.redhat.com/show_bug.cgi?id=1526866
  [ 3 ] Bug #1504807 - CVE-2017-15670 CVE-2017-15671 glibc: various flaws
 [fedora-all]
        https://bugzilla.redhat.com/show_bug.cgi?id=1504807
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade glibc' at the command line.
For more information, refer to the dnf documentation available at
http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
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