7.2 - RHSA-2016:2573

Problem Description:

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) - 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 stack overflow vulnerability was found in _nss_dns_getnetbyname_r. On systems with nsswitch configured to include "networks: dns" with a privileged or network-facing service that would attempt to resolve user-provided network names, an attacker could provide an excessively long network name, resulting in stack corruption and code execution. (CVE-2016-3075)

This issue was discovered by Florian Weimer (Red Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 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/):

971416 - Locale alias no_NO.ISO-8859-1 not working. 1027348 - sem_post/sem_wait race causing sem_post to return EINVAL 1064063 - Test suite failure: tst-mqueue5 1099235 - CVE-2015-5277 glibc: nss_files doesn't detect ERANGE problems correctly [rhel-7.3] 1140250 - Unexpected results from using posix_fallocate with nfs target 1211100 - ld.so crash when audit modules provide path 1211823 - iconv: missing support for HKSCS-2008 in BIG5-HKSCS in rhel7 glibc 1249102 - "monstartup: out of memory" on PPC64LE 1255822 - glibc: malloc may fall back to calling mmap prematurely if arenas are contended 1276631 - glibc: hide backtrace from tst-malloc-backtrace 1276753 - malloc: arena free list can become cyclic, increasing contention 1293976 - CVE-2015-5229 glibc: calloc() returns non-zero'ed memory [rhel-7.3.0] 1298354 - Backport test-skeleton.c conversions. 1305406 - invalid fastbin entry (free), missing glibc patch 1320596 - glibc: NULL pointer dereference in stub resolver with unconnectable name server addresses 1321866 - CVE-2016-3075 glibc: Stack overflow in nss_dns_getnetbyname_r 1335629 - aarch64: MINSIGSTKSZ is (much) too small 1335925 - glibc: Fix aarch64 ABI issues 1346397 - glibc: debug/tst-longjump_chk2 calls printf from a signal handler