Fedora 26: glibc Security Update 2018-8e27ad96ed
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-2017-15670,
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).
[ 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
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
FEDORA-2018-8e27ad96ed 2018-01-23 21:16:49.691231 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. 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). [ 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 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
