Exploit the possiblities

Red Hat Security Advisory 2017-1481-01

Red Hat Security Advisory 2017-1481-01
Posted Jun 19, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-1481-01 - 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 flaw was found in the way memory was being allocated on the stack for user space binaries. If heap and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is glibc-side mitigation which blocks processing of LD_LIBRARY_PATH for programs running in secure-execution mode and reduces the number of allocations performed by the processing of LD_AUDIT, LD_PRELOAD, and LD_HWCAP_MASK, making successful exploitation of this issue more difficult.

tags | advisory
systems | linux, redhat, osx
advisories | CVE-2017-1000366
MD5 | 26d01b92643e1ee3f841e2985d2bd969

Red Hat Security Advisory 2017-1481-01

Change Mirror Download

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=====================================================================
Red Hat Security Advisory

Synopsis: Important: glibc security update
Advisory ID: RHSA-2017:1481-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:1481
Issue date: 2017-06-19
CVE Names: CVE-2017-1000366
=====================================================================

1. Summary:

An update for glibc is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

The glibc packages provide the standard C libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the name
service cache daemon (nscd) used by multiple programs on the system.
Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

* A flaw was found in the way memory was being allocated on the stack for
user space binaries. If heap (or different memory region) and stack memory
regions were adjacent to each other, an attacker could use this flaw to
jump over the stack guard gap, cause controlled memory corruption on
process stack or the adjacent memory region, and thus increase their
privileges on the system. This is glibc-side mitigation which blocks
processing of LD_LIBRARY_PATH for programs running in secure-execution mode
and reduces the number of allocations performed by the processing of
LD_AUDIT, LD_PRELOAD, and LD_HWCAP_MASK, making successful exploitation of
this issue more difficult. (CVE-2017-1000366)

Red Hat would like to thank Qualys Research Labs for reporting this issue.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the glibc library
must be restarted, or the system rebooted.

5. Bugs fixed (https://bugzilla.redhat.com/):

1452543 - CVE-2017-1000366 glibc: heap/stack gap jumping via unbounded stack allocations

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
glibc-2.17-157.el7_3.4.src.rpm

x86_64:
glibc-2.17-157.el7_3.4.i686.rpm
glibc-2.17-157.el7_3.4.x86_64.rpm
glibc-common-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-devel-2.17-157.el7_3.4.i686.rpm
glibc-devel-2.17-157.el7_3.4.x86_64.rpm
glibc-headers-2.17-157.el7_3.4.x86_64.rpm
glibc-utils-2.17-157.el7_3.4.x86_64.rpm
nscd-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-static-2.17-157.el7_3.4.i686.rpm
glibc-static-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
glibc-2.17-157.el7_3.4.src.rpm

x86_64:
glibc-2.17-157.el7_3.4.i686.rpm
glibc-2.17-157.el7_3.4.x86_64.rpm
glibc-common-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-devel-2.17-157.el7_3.4.i686.rpm
glibc-devel-2.17-157.el7_3.4.x86_64.rpm
glibc-headers-2.17-157.el7_3.4.x86_64.rpm
glibc-utils-2.17-157.el7_3.4.x86_64.rpm
nscd-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-static-2.17-157.el7_3.4.i686.rpm
glibc-static-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
glibc-2.17-157.el7_3.4.src.rpm

aarch64:
glibc-2.17-157.el7_3.4.aarch64.rpm
glibc-common-2.17-157.el7_3.4.aarch64.rpm
glibc-debuginfo-2.17-157.el7_3.4.aarch64.rpm
glibc-devel-2.17-157.el7_3.4.aarch64.rpm
glibc-headers-2.17-157.el7_3.4.aarch64.rpm
glibc-utils-2.17-157.el7_3.4.aarch64.rpm
nscd-2.17-157.el7_3.4.aarch64.rpm

ppc64:
glibc-2.17-157.el7_3.4.ppc.rpm
glibc-2.17-157.el7_3.4.ppc64.rpm
glibc-common-2.17-157.el7_3.4.ppc64.rpm
glibc-debuginfo-2.17-157.el7_3.4.ppc.rpm
glibc-debuginfo-2.17-157.el7_3.4.ppc64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc64.rpm
glibc-devel-2.17-157.el7_3.4.ppc.rpm
glibc-devel-2.17-157.el7_3.4.ppc64.rpm
glibc-headers-2.17-157.el7_3.4.ppc64.rpm
glibc-utils-2.17-157.el7_3.4.ppc64.rpm
nscd-2.17-157.el7_3.4.ppc64.rpm

ppc64le:
glibc-2.17-157.el7_3.4.ppc64le.rpm
glibc-common-2.17-157.el7_3.4.ppc64le.rpm
glibc-debuginfo-2.17-157.el7_3.4.ppc64le.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc64le.rpm
glibc-devel-2.17-157.el7_3.4.ppc64le.rpm
glibc-headers-2.17-157.el7_3.4.ppc64le.rpm
glibc-utils-2.17-157.el7_3.4.ppc64le.rpm
nscd-2.17-157.el7_3.4.ppc64le.rpm

s390x:
glibc-2.17-157.el7_3.4.s390.rpm
glibc-2.17-157.el7_3.4.s390x.rpm
glibc-common-2.17-157.el7_3.4.s390x.rpm
glibc-debuginfo-2.17-157.el7_3.4.s390.rpm
glibc-debuginfo-2.17-157.el7_3.4.s390x.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.s390.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.s390x.rpm
glibc-devel-2.17-157.el7_3.4.s390.rpm
glibc-devel-2.17-157.el7_3.4.s390x.rpm
glibc-headers-2.17-157.el7_3.4.s390x.rpm
glibc-utils-2.17-157.el7_3.4.s390x.rpm
nscd-2.17-157.el7_3.4.s390x.rpm

x86_64:
glibc-2.17-157.el7_3.4.i686.rpm
glibc-2.17-157.el7_3.4.x86_64.rpm
glibc-common-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-devel-2.17-157.el7_3.4.i686.rpm
glibc-devel-2.17-157.el7_3.4.x86_64.rpm
glibc-headers-2.17-157.el7_3.4.x86_64.rpm
glibc-utils-2.17-157.el7_3.4.x86_64.rpm
nscd-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
glibc-debuginfo-2.17-157.el7_3.4.aarch64.rpm
glibc-static-2.17-157.el7_3.4.aarch64.rpm

ppc64:
glibc-debuginfo-2.17-157.el7_3.4.ppc.rpm
glibc-debuginfo-2.17-157.el7_3.4.ppc64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc64.rpm
glibc-static-2.17-157.el7_3.4.ppc.rpm
glibc-static-2.17-157.el7_3.4.ppc64.rpm

ppc64le:
glibc-debuginfo-2.17-157.el7_3.4.ppc64le.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.ppc64le.rpm
glibc-static-2.17-157.el7_3.4.ppc64le.rpm

s390x:
glibc-debuginfo-2.17-157.el7_3.4.s390.rpm
glibc-debuginfo-2.17-157.el7_3.4.s390x.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.s390.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.s390x.rpm
glibc-static-2.17-157.el7_3.4.s390.rpm
glibc-static-2.17-157.el7_3.4.s390x.rpm

x86_64:
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-static-2.17-157.el7_3.4.i686.rpm
glibc-static-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
glibc-2.17-157.el7_3.4.src.rpm

x86_64:
glibc-2.17-157.el7_3.4.i686.rpm
glibc-2.17-157.el7_3.4.x86_64.rpm
glibc-common-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-devel-2.17-157.el7_3.4.i686.rpm
glibc-devel-2.17-157.el7_3.4.x86_64.rpm
glibc-headers-2.17-157.el7_3.4.x86_64.rpm
glibc-utils-2.17-157.el7_3.4.x86_64.rpm
nscd-2.17-157.el7_3.4.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
glibc-debuginfo-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-2.17-157.el7_3.4.x86_64.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.i686.rpm
glibc-debuginfo-common-2.17-157.el7_3.4.x86_64.rpm
glibc-static-2.17-157.el7_3.4.i686.rpm
glibc-static-2.17-157.el7_3.4.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-1000366
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/stackguard

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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