Topic

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 Moderate. 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.

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 stack overflow vulnerability was found in nan* functions that could cause applications, which process long strings with the nan function, to crash or, potentially, execute arbitrary code. (CVE-2014-9761)
• It was found that out-of-range time values passed to the strftime() function could result in an out-of-bounds memory access. This could lead to application crash or, potentially, information disclosure. (CVE-2015-8776)
• An integer overflow vulnerability was found in hcreate() and hcreate_r() functions which could result in an out-of-bounds memory access. This could lead to application crash or, potentially, arbitrary code execution. (CVE-2015-8778)
• A stack based buffer overflow vulnerability was found in the catopen() function. An excessively long string passed to the function could cause it to crash or, potentially, execute arbitrary code. (CVE-2015-8779)
• It was found that the dynamic loader did not sanitize the LD_POINTER_GUARD environment variable. An attacker could use this flaw to bypass the pointer guarding protection on set-user-ID or set-group-ID programs to execute arbitrary code with the permissions of the user running the application. (CVE-2015-8777)

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

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.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
• Red Hat Virtualization Host 4 for RHEL 7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.7 ppc64le
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.4 x86_64

Fixes

• BZ - 906468 - Deadlock in glibc between fork and malloc
• BZ - 1213603 - glibc: nss_db: get*ent crashes without preceding set*ent
• BZ - 1260581 - CVE-2015-8777 glibc: LD_POINTER_GUARD in the environment is not sanitized
• BZ - 1298975 - [RFE] Backport the groups merging feature
• BZ - 1300299 - CVE-2015-8776 glibc: Segmentation fault caused by passing out-of-range data to strftime()
• BZ - 1300303 - CVE-2015-8778 glibc: Integer overflow in hcreate and hcreate_r
• BZ - 1300310 - CVE-2014-9761 glibc: Unbounded stack allocation in nan* functions
• BZ - 1300312 - CVE-2015-8779 glibc: Unbounded stack allocation in catopen function
• BZ - 1318877 - Per C11 and C++11, <stdint.h> should not look at __STDC_LIMIT_MACROS or __STDC_CONSTANT_MACROS
• BZ - 1318890 - glibc: nss_db: long group entries are skipped
• BZ - 1322544 - Segmentation violation can occur within glibc if fork() is used in a multi-threaded application
• BZ - 1324568 - glibc: getent returns dud entry when nscd enabled
• BZ - 1325138 - glibc: Corrupted aux-cache causes ldconfig to segfault
• BZ - 1330705 - open() and openat() ignore 'mode' with O_TMPFILE on newer kernels
• BZ - 1338672 - glibc: GCC 6 enablement for struct sockaddr_storage
• BZ - 1366569 - glibc: default nsswitch.conf should not set initgroups
• BZ - 1370630 - glibc: nss_db: Endless loop in services database processing
• BZ - 1387874 - MSG_FASTOPEN definition missing
• BZ - 1392540 - glibc: default nsswitch.conf does not list sss for the automount service
• BZ - 1404435 - "yum update" on fresh installation of RHEL 7.0 or 7.1 PPC64 (updating to 7.3) results in various yum errors
• BZ - 1417205 - Missing AF_VSOCK <sys/socket.h> constant
• BZ - 1418978 - glibc: backport upstream support/ directory
• BZ - 1421155 - Update dynamic loader trampoline for Intel SSE, AVX, and AVX512 usage.
• BZ - 1439165 - glibc: SYS_getrandom definition missing on s390x

CVEs

• CVE-2014-9761
• CVE-2015-8776
• CVE-2015-8777
• CVE-2015-8778
• CVE-2015-8779

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html