nx nxnode: multiple vulnerabilities

From the Gentoo advisory:

Multiple integer overflow and buffer overflow vulnerabilities have been discovered in the X.Org X server as shipped by NX and NX Node (vulnerabilities 1-4 in GLSA 200801-09).

A remote attacker could exploit these vulnerabilities via unspecified vectors, leading to the execution of arbitrary code with the privileges of the user on the machine running the NX server.