Scientific Linux Security Update : glibc on SL7.x x86_64

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

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.

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.

See also :

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 88798 ()

Bugtraq ID:

CVE ID: CVE-2015-5229

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