A stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. A remote attacker could create a specially crafted DNS response which could cause libresolv to crash or, potentially, execute code with the permissions of the user running the library. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module. (CVE-2015-7547)

It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.
(CVE-2015-5229)

This update also fixes the following bugs :

  - The existing implementation of the 'free' function     causes all memory pools beyond the first to return freed     memory directly to the operating system as quickly as     possible. This can result in performance degradation     when the rate of free calls is very high. The first     memory pool (the main pool) does provide a method to     rate limit the returns via M_TRIM_THRESHOLD, but this     method is not available to subsequent memory pools.

With this update, the M_TRIM_THRESHOLD method is extended to apply to all memory pools, which improves performance for threads with very high amounts of free calls and limits the number of 'madvise' system calls. The change also increases the total transient memory usage by processes because the trim threshold must be reached before memory can be freed.

To return to the previous behavior, you can either set M_TRIM_THRESHOLD using the 'mallopt' function, or set the MALLOC_TRIM_THRESHOLD environment variable to 0.

  - On the little-endian variant of 64-bit IBM Power Systems     (ppc64le), a bug in the dynamic loader could cause     applications compiled with profiling enabled to fail to     start with the error 'monstartup: out of memory'. The     bug has been corrected and applications compiled for     profiling now start correctly.

Updated glibc packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Critical security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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.

A stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. A remote attacker could create a specially crafted DNS response which could cause libresolv to crash or, potentially, execute code with the permissions of the user running the library. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module. (CVE-2015-7547)

It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.
(CVE-2015-5229)

The CVE-2015-7547 issue was discovered by the Google Security Team and Red Hat. Red Hat would like to thank Jeff Layton for reporting the CVE-2015-5229 issue.

This update also fixes the following bugs :

* The existing implementation of the 'free' function causes all memory pools beyond the first to return freed memory directly to the operating system as quickly as possible. This can result in performance degradation when the rate of free calls is very high. The first memory pool (the main pool) does provide a method to rate limit the returns via M_TRIM_THRESHOLD, but this method is not available to subsequent memory pools.

With this update, the M_TRIM_THRESHOLD method is extended to apply to all memory pools, which improves performance for threads with very high amounts of free calls and limits the number of 'madvise' system calls. The change also increases the total transient memory usage by processes because the trim threshold must be reached before memory can be freed.

To return to the previous behavior, you can either set M_TRIM_THRESHOLD using the 'mallopt' function, or set the MALLOC_TRIM_THRESHOLD environment variable to 0. (BZ#1298930)

* On the little-endian variant of 64-bit IBM Power Systems (ppc64le), a bug in the dynamic loader could cause applications compiled with profiling enabled to fail to start with the error 'monstartup: out of memory'. The bug has been corrected and applications compiled for profiling now start correctly. (BZ#1298956)

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.

From Red Hat Security Advisory 2016:0176 :

Updated glibc packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Critical security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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.

A stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. A remote attacker could create a specially crafted DNS response which could cause libresolv to crash or, potentially, execute code with the permissions of the user running the library. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module. (CVE-2015-7547)

It was discovered that the calloc implementation in glibc could return memory areas which contain non-zero bytes. This could result in unexpected application behavior such as hangs or crashes.
(CVE-2015-5229)

The CVE-2015-7547 issue was discovered by the Google Security Team and Red Hat. Red Hat would like to thank Jeff Layton for reporting the CVE-2015-5229 issue.

This update also fixes the following bugs :

* The existing implementation of the 'free' function causes all memory pools beyond the first to return freed memory directly to the operating system as quickly as possible. This can result in performance degradation when the rate of free calls is very high. The first memory pool (the main pool) does provide a method to rate limit the returns via M_TRIM_THRESHOLD, but this method is not available to subsequent memory pools.

With this update, the M_TRIM_THRESHOLD method is extended to apply to all memory pools, which improves performance for threads with very high amounts of free calls and limits the number of 'madvise' system calls. The change also increases the total transient memory usage by processes because the trim threshold must be reached before memory can be freed.

To return to the previous behavior, you can either set M_TRIM_THRESHOLD using the 'mallopt' function, or set the MALLOC_TRIM_THRESHOLD environment variable to 0. (BZ#1298930)

* On the little-endian variant of 64-bit IBM Power Systems (ppc64le), a bug in the dynamic loader could cause applications compiled with profiling enabled to fail to start with the error 'monstartup: out of memory'. The bug has been corrected and applications compiled for profiling now start correctly. (BZ#1298956)

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

ID	Name	Product	Family	Published	Updated	Severity
88798	Scientific Linux Security Update : glibc on SL7.x x86_64 (20160216)	Nessus	Scientific Linux Local Security Checks	2/17/2016	1/14/2021	high
88758	CentOS 7 : glibc (CESA-2016:0176)	Nessus	CentOS Local Security Checks	2/17/2016	1/4/2021	high
89841	Amazon Linux AMI : glibc (ALAS-2016-660)	Nessus	Amazon Linux Local Security Checks	3/11/2016	4/18/2018	high
88777	Oracle Linux 7 : glibc (ELSA-2016-0176)	Nessus	Oracle Linux Local Security Checks	2/17/2016	1/14/2021	high
88785	RHEL 7 : glibc (RHSA-2016:0176)	Nessus	Red Hat Local Security Checks	2/17/2016	10/24/2019	high

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