libvncserver: libvncclient/rfbproto.c does not limit TextChat size

An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size...

ALPINE-CVE-2018-7225

An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact e.g., an integer overflow via specially crafted VNC packets...