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Fedora 22: FEDORA-2016-0480defc94 Critical: glibc DNS Issues

fedora
Calendar Grey February 17, 2016
Dist Fedora Esm H88
Essential glibc security patch for Fedora 22 tackling DNS resolution flaws alongside enhancements in memory allocation.
This updates addresses a critical security vulnerability in the DNS resolver related to `AF_UNSPEC` queries with `getaddrinfo` (CVE-2015-7547)

Summary

The glibc package contains standard libraries which are used by

multiple programs on the system. In order to save disk space and

memory, as well as to make upgrading easier, common system code is

kept in one place and shared between programs. This particular package

contains the most important sets of shared libraries: the standard C

library and the standard math library. Without these two libraries, a

Linux system will not function.

Update Information:

This updates addresses a critical security vulnerability in the DNS resolver related to `AF_UNSPEC` queries with `getaddrinfo` (CVE-2015-7547). It also includes security fixes for CVE-2015-8777 and CVE-2015-1781. It improves `malloc` scalability for applications which start and terminate many threads. The output of `locale -a` is now ASCII-only (previously, it contained ISO-8859-1 characters).

Topics%20covered

Topics Covered

security advisory critical Fedora glibc DNS fix malloc improvement

Change Log

References


[ 1 ] Bug #1199525 - CVE-2015-1781 glibc: buffer overflow in gethostbyname_r() and related functions with misaligned buffer https://bugzilla.redhat.com/show_bug.cgi?id=1199525 [ 2 ] Bug #1260581 - CVE-2015-8777 glibc: LD_POINTER_GUARD in the environment is not sanitized https://bugzilla.redhat.com/show_bug.cgi?id=1260581 [ 3 ] Bug #1293532 - CVE-2015-7547 glibc: getaddrinfo stack-based buffer overflow https://bugzilla.redhat.com/show_bug.cgi?id=1293532

Update Instructions

This update can be installed with the "yum" update program. Use su -c 'yum update glibc' at the command line. For more information, refer to "Managing Software with yum", available at .

Severity
critical
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Critical

Name: glibc
Product: Fedora 22
Version: 2.21
Release: 11.fc22
URL: https://www.gnu.org/software/libc/
Summary: The GNU libc libraries

Topics%20covered

Topics Covered

security advisory critical Fedora glibc DNS fix malloc improvement

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