From: Doug Flick <dougflick@microsoft.com>

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4536

Bug Overview:
PixieFail Bug #3
CVE-2023-45231
CVSS 6.5 : CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-125 Out-of-bounds Read

Out-of-bounds read when handling a ND Redirect message with truncated
options

Change Overview:

Adds a check to prevent truncated options from being parsed
+  //
+  // Cannot process truncated options.
+  // Cannot process options with a length of 0 as there is no Type
field.
+  //
+  if (OptionLen < sizeof (IP6_OPTION_HEADER)) {
+    return FALSE;
+  }

Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>

Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
---
 NetworkPkg/Ip6Dxe/Ip6Option.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/NetworkPkg/Ip6Dxe/Ip6Option.c b/NetworkPkg/Ip6Dxe/Ip6Option.c
index 199eea124dfe..8718d5d8756a 100644
--- a/NetworkPkg/Ip6Dxe/Ip6Option.c
+++ b/NetworkPkg/Ip6Dxe/Ip6Option.c
@@ -137,6 +137,14 @@ Ip6IsNDOptionValid (
     return FALSE;
   }
 
+  //
+  // Cannot process truncated options.
+  // Cannot process options with a length of 0 as there is no Type field.
+  //
+  if (OptionLen < sizeof (IP6_OPTION_HEADER)) {
+    return FALSE;
+  }
+
   Offset = 0;
 
   //
-- 
2.43.0



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