In case that you need to find out the exact libc version installed on you Debian Linux system use ldd command. The output of this command will output libc version in its output:
# ldd --version
ldd (Debian EGLIBC 2.13-38+deb7u1) 2.13

Another way how to check your libc library version is to run its binary:
# /lib/x86_64-linux-gnu/libc.so.6
GNU C Library (Debian EGLIBC 2.13-38+deb7u1) stable release version 2.13, by Roland McGrath et al.
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.4.7.
Compiled on a Linux 3.2.51 system on 2013-12-22.
Available extensions:
	crypt add-on version 2.1 by Michael Glad and others
	GNU Libidn by Simon Josefsson
	Native POSIX Threads Library by Ulrich Drepper et al
	BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
.
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