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):

• glibc: getaddrinfo should reject IP addresses with trailing characters (CVE-2016-10739)

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 7.7 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 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 Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

• BZ - 1039304 - glibc: More precise DNS name checks (accepting dash-.example.com, among other things)
• BZ - 1347549 - CVE-2016-10739 glibc: getaddrinfo should reject IP addresses with trailing characters
• BZ - 1443872 - glibc: Terminate process on invalid netlink response from kernel
• BZ - 1488370 - nscd: Add a comment to the default nscd.conf file that is it not recommended to use NSCD and SSSD for the same NSS maps
• BZ - 1555189 - glibc: The Japanese Era name will be changed on May 1, 2019 [rhel-7.7.0]
• BZ - 1579354 - glibc: Initialize msg_flags to zero for sendmmsg in resolver
• BZ - 1579730 - glibc: Fix i386 sigaction sa_restorer initialization
• BZ - 1579739 - glibc: Fix stack overflow with huge PT_NOTE segment
• BZ - 1591268 - glibc: Problem with iconv converting ISO8859-1 to IBM273 [rhel-7]
• BZ - 1592475 - glibc headers: add ipc STAT_ANY constants
• BZ - 1595191 - glibc: Backport libio vtable validation improvements
• BZ - 1609067 - pldd does not wait for SIGSTOP after PTRACE_ATTACH
• BZ - 1640764 - glibc-rh1505492-prototypes-intl.patch causes intermittent problems building glibc
• BZ - 1641981 - glibc: Incorrect analysis of x86 CPU properties selects wrong string functions
• BZ - 1646373 - glibc: Crash in getaddrinfo_a when thread creation fails
• BZ - 1647490 - glibc: stdlib/test-bz22786 test suite failure on s390x [rhel-7.7]
• BZ - 1661508 - glibc: Adjust to rpm's find-debuginfo.sh changes, to keep stripping binaries [rhel-7.7]
• BZ - 1662842 - glibc: realloc ncopies integer overflow [rhel-7]
• BZ - 1684874 - glibc: Add more Linux definitions to <netinet/in.h>, including IP*_PMTUDISC_OMIT

CVEs

• CVE-2016-10739

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index