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Test your applicationsUpgrade RHEL:7 glibc to version 0:2.17-78.el7 or higher.
This issue was patched in RHSA-2015:0327.
Note: Versions mentioned in the description apply only to the upstream glibc package and not the glibc package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
DB_LOOKUP in nss_files/files-XXX.c in the Name Service Switch (NSS) in GNU C Library (aka glibc or libc6) 2.21 and earlier does not properly check if a file is open, which allows remote attackers to cause a denial of service (infinite loop) by performing a look-up on a database while iterating over it, which triggers the file pointer to be reset.