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

Synopsis:          Low: glibc security, bug fix, and enhancement update
Advisory ID:       RHSA-2020:3861-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:3861
Issue date:        2020-09-29
CVE Names:         CVE-2019-19126
====================================================================
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 Low. 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) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - 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):

* glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries
(CVE-2019-19126)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.9 Release Notes linked from the References section.

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/):

1763325 - argp.h kills __attribute__, causing gcc 4.8.5 with -std=c++ results in compile / link errors for __gthrw_pthread_mutex_* functions
1772307 - glibc: Measured performance loss in lmbench for bcopy on Haswell processor
1774681 - CVE-2019-19126 glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries
1775816 - glibc: Disable libio vtable validation for interposed pre-2.1 stdio handles [rhel-7]
1795573 - glibc: Remove problematic Obsoletes: from the spec file
1834816 - glibc: internal_end*ent in nss_compat may clobber errno, hiding ERANGE

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
glibc-2.17-317.el7.src.rpm

x86_64:
glibc-2.17-317.el7.i686.rpm
glibc-2.17-317.el7.x86_64.rpm
glibc-common-2.17-317.el7.x86_64.rpm
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-devel-2.17-317.el7.i686.rpm
glibc-devel-2.17-317.el7.x86_64.rpm
glibc-headers-2.17-317.el7.x86_64.rpm
glibc-utils-2.17-317.el7.x86_64.rpm
nscd-2.17-317.el7.x86_64.rpm

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

x86_64:
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-static-2.17-317.el7.i686.rpm
glibc-static-2.17-317.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
glibc-2.17-317.el7.src.rpm

x86_64:
glibc-2.17-317.el7.i686.rpm
glibc-2.17-317.el7.x86_64.rpm
glibc-common-2.17-317.el7.x86_64.rpm
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-devel-2.17-317.el7.i686.rpm
glibc-devel-2.17-317.el7.x86_64.rpm
glibc-headers-2.17-317.el7.x86_64.rpm
glibc-utils-2.17-317.el7.x86_64.rpm
nscd-2.17-317.el7.x86_64.rpm

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

x86_64:
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-static-2.17-317.el7.i686.rpm
glibc-static-2.17-317.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
glibc-2.17-317.el7.src.rpm

ppc64:
glibc-2.17-317.el7.ppc.rpm
glibc-2.17-317.el7.ppc64.rpm
glibc-common-2.17-317.el7.ppc64.rpm
glibc-debuginfo-2.17-317.el7.ppc.rpm
glibc-debuginfo-2.17-317.el7.ppc64.rpm
glibc-debuginfo-common-2.17-317.el7.ppc.rpm
glibc-debuginfo-common-2.17-317.el7.ppc64.rpm
glibc-devel-2.17-317.el7.ppc.rpm
glibc-devel-2.17-317.el7.ppc64.rpm
glibc-headers-2.17-317.el7.ppc64.rpm
glibc-utils-2.17-317.el7.ppc64.rpm
nscd-2.17-317.el7.ppc64.rpm

ppc64le:
glibc-2.17-317.el7.ppc64le.rpm
glibc-common-2.17-317.el7.ppc64le.rpm
glibc-debuginfo-2.17-317.el7.ppc64le.rpm
glibc-debuginfo-common-2.17-317.el7.ppc64le.rpm
glibc-devel-2.17-317.el7.ppc64le.rpm
glibc-headers-2.17-317.el7.ppc64le.rpm
glibc-utils-2.17-317.el7.ppc64le.rpm
nscd-2.17-317.el7.ppc64le.rpm

s390x:
glibc-2.17-317.el7.s390.rpm
glibc-2.17-317.el7.s390x.rpm
glibc-common-2.17-317.el7.s390x.rpm
glibc-debuginfo-2.17-317.el7.s390.rpm
glibc-debuginfo-2.17-317.el7.s390x.rpm
glibc-debuginfo-common-2.17-317.el7.s390.rpm
glibc-debuginfo-common-2.17-317.el7.s390x.rpm
glibc-devel-2.17-317.el7.s390.rpm
glibc-devel-2.17-317.el7.s390x.rpm
glibc-headers-2.17-317.el7.s390x.rpm
glibc-utils-2.17-317.el7.s390x.rpm
nscd-2.17-317.el7.s390x.rpm

x86_64:
glibc-2.17-317.el7.i686.rpm
glibc-2.17-317.el7.x86_64.rpm
glibc-common-2.17-317.el7.x86_64.rpm
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-devel-2.17-317.el7.i686.rpm
glibc-devel-2.17-317.el7.x86_64.rpm
glibc-headers-2.17-317.el7.x86_64.rpm
glibc-utils-2.17-317.el7.x86_64.rpm
nscd-2.17-317.el7.x86_64.rpm

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

ppc64:
glibc-debuginfo-2.17-317.el7.ppc.rpm
glibc-debuginfo-2.17-317.el7.ppc64.rpm
glibc-debuginfo-common-2.17-317.el7.ppc.rpm
glibc-debuginfo-common-2.17-317.el7.ppc64.rpm
glibc-static-2.17-317.el7.ppc.rpm
glibc-static-2.17-317.el7.ppc64.rpm

ppc64le:
glibc-debuginfo-2.17-317.el7.ppc64le.rpm
glibc-debuginfo-common-2.17-317.el7.ppc64le.rpm
glibc-static-2.17-317.el7.ppc64le.rpm

s390x:
glibc-debuginfo-2.17-317.el7.s390.rpm
glibc-debuginfo-2.17-317.el7.s390x.rpm
glibc-debuginfo-common-2.17-317.el7.s390.rpm
glibc-debuginfo-common-2.17-317.el7.s390x.rpm
glibc-static-2.17-317.el7.s390.rpm
glibc-static-2.17-317.el7.s390x.rpm

x86_64:
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-static-2.17-317.el7.i686.rpm
glibc-static-2.17-317.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
glibc-2.17-317.el7.src.rpm

x86_64:
glibc-2.17-317.el7.i686.rpm
glibc-2.17-317.el7.x86_64.rpm
glibc-common-2.17-317.el7.x86_64.rpm
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-devel-2.17-317.el7.i686.rpm
glibc-devel-2.17-317.el7.x86_64.rpm
glibc-headers-2.17-317.el7.x86_64.rpm
glibc-utils-2.17-317.el7.x86_64.rpm
nscd-2.17-317.el7.x86_64.rpm

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

x86_64:
glibc-debuginfo-2.17-317.el7.i686.rpm
glibc-debuginfo-2.17-317.el7.x86_64.rpm
glibc-debuginfo-common-2.17-317.el7.i686.rpm
glibc-debuginfo-common-2.17-317.el7.x86_64.rpm
glibc-static-2.17-317.el7.i686.rpm
glibc-static-2.17-317.el7.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-2019-19126
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index

8. Contact:

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

Copyright 2020 Red Hat, Inc.
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