Description:  It is possible to reconfigure the network on Linux by calling write(2) on an appropriately connected netlink socket.  By passing such a socket as stdout or stderr to a setuid program, anyone can reconfigure the network.
References:
Notes:
Bugs: 746738
upstream: released (3.15-rc5) [90f62cf30a78721641e08737bda787552428061e, 5187cd055b6e81fc6526109456f8b20623148d5f, a53b72c83a4216f2eb883ed45a0cbce014b8e62d, a3b299da869d6e78cf42ae0b1b41797bcb8c5e4b, aa4cf9452f469f16cea8c96283b641b4576d4a7b]
2.6.32-upstream-stable: ignored "too intrusive to backport"
sid: released (3.14.9-1)
3.2-wheezy-security: ignored "too intrusive to backport"
2.6.32-squeeze-security: ignored "too intrusive to backport"
3.2-upstream-stable: ignored "too intrusive to backport"