diff --git a/pkgs/applications/virtualization/virtualbox/default.nix b/pkgs/applications/virtualization/virtualbox/default.nix
index 09b6e015a93..652b2ed92c1 100644
--- a/pkgs/applications/virtualization/virtualbox/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/default.nix
@@ -11,7 +11,7 @@ with stdenv.lib;
 
 let
 
-  version = "4.2.16"; # changes ./guest-additions as well
+  version = "4.2.18"; # changes ./guest-additions as well
 
   forEachModule = action: ''
     for mod in \
@@ -31,13 +31,13 @@ let
   '';
 
   # See https://github.com/NixOS/nixpkgs/issues/672 for details
-  extpackRevision = "86992";
+  extpackRevision = "88780";
   extensionPack = requireFile rec {
     name = "Oracle_VM_VirtualBox_Extension_Pack-${version}-${extpackRevision}.vbox-extpack";
     # IMPORTANT: Hash must be base16 encoded because it's used as an input to
     # VBoxExtPackHelperApp!
-    # Tip: nix-hash --type sha256 --to-base16 "hash from nix-prefetch-url"
-    sha256 = "8f88b1ebe69b770103e9151bebf6681c5e049eb5fac45ae8d52c43440aa0fa0d";
+    # Tip: see http://dlc.sun.com.edgesuite.net/virtualbox/4.2.18/SHA256SUMS
+    sha256 = "1d1737b59d0f30f5d42beeabaff168bdc0a75b8b28df685979be6173e5adbbba";
     message = ''
       In order to use the extension pack, you need to comply with the VirtualBox Personal Use
       and Evaluation License (PUEL) by downloading the related binaries from:
@@ -56,7 +56,7 @@ in stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
-    sha256 = "0nnl8qh8j4sk5zn78hrp6ccidmk332p7qg6pv5a0a4irs0b8j3zz";
+    sha256 = "9dbddf393b029c549249f627d12040c1d257972bc09292969b8819a31ab78d74";
   };
 
   buildInputs =
diff --git a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
index cca133685f6..de38843c7f1 100644
--- a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VBoxGuestAdditions_${version}.iso";
-    sha256 = "1id0rb2sdnn34rvjl2v3hp3z9g9c4s4f4kl1lx0myjlqv8i0fayg";
+    sha256 = "f11a7f13dfe7bf9f246fb877144bb467fe6deadcd876568ec79b6ccd3b59d767";
   };
 
   KERN_DIR = "${kernelDev}/lib/modules/*/build";