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RHSA-2015:0863: glibc security and bug fix update

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RHSA-2015:0863: glibc security and bug fix update



The glibc packages provide the standard C libraries (libc), POSIX threadlibraries (libpthread), standard math libraries (libm), and the NameServer Caching Daemon (nscd) used by multiple programs on the system.Without these libraries, the Linux system cannot function correctly.A buffer overflow flaw was found in the way glibc's gethostbyname_r() andother related functions computed the size of a buffer when passed amisaligned buffer as input. An attacker able to make an application callany of these functions with a misaligned buffer could use this flaw tocrash the application or, potentially, execute arbitrary code with thepermissions of the user running the application. (CVE-2015-1781)It was discovered that, under certain circumstances, glibc's getaddrinfo()function would send DNS queries to random file descriptors. An attackercould potentially use this flaw to send DNS queries to unintendedrecipients, resulting in information disclosure or data loss due to theapplication encountering corrupted data. (CVE-2013-7423)The CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.This update also fixes the following bug:All glibc users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues.


  • redhat-upgrade-glibc
  • redhat-upgrade-glibc-common
  • redhat-upgrade-glibc-debuginfo
  • redhat-upgrade-glibc-debuginfo-common
  • redhat-upgrade-glibc-devel
  • redhat-upgrade-glibc-headers
  • redhat-upgrade-glibc-static
  • redhat-upgrade-glibc-utils
  • redhat-upgrade-nscd

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