Fedora 27: glibc Security Update 2018-7714b514e2
Summary
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.
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).
[ 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
su -c 'dnf upgrade glibc' at the command line.
For more information, refer to the dnf documentation available at
https://dnf.readthedocs.io/en/latest/command_ref.html
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/security/
package-announce mailing list -- package-announce@lists.fedoraproject.org
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FEDORA-2018-7714b514e2 2018-01-23 21:42:17.543365 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. 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). [ 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 su -c 'dnf upgrade glibc' at the command line. For more information, refer to the dnf documentation available at https://dnf.readthedocs.io/en/latest/command_ref.html 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/security/ package-announce mailing list -- package-announce@lists.fedoraproject.org To unsubscribe send an email to package-announce-leave@lists.fedoraproject.org
Change Log
References
Update Instructions
