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Fedora Update Notification
FEDORA-2018-7714b514e2
2018-01-23 21:42:17.543365
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Name        : glibc
Product     : Fedora 27
Version     : 2.26
Release     : 24.fc27
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-2017-16997: 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 changes the thread stack size accounting to provide
additional stack space compared to previous glibc versions. For some
applications (`nptd` in particular), the `PTHREAD_STACK_MIN` stack size was too
small on x86-64 machines with AVX-512 support (RHBZ#1527887).
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References:

  [ 1 ] 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
  [ 2 ] 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
  [ 3 ] Bug #1527887 - glibc: PTHREAD_STACK_MIN is too small on x86-64
        https://bugzilla.redhat.com/show_bug.cgi?id=1527887
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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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