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edk2/0067-NetworkPkg-UefiPxeBcDxe-SECURITY-PATCH-CVE-2023-4523.patch
yexiao 9fe974a680 Fix some CVE 
Fix CVE-2023-45229、CVE-2023-45230、CVE-2023-45231、
CVE-2023-45232、CVE-2023-45233、CVE-2023-45234、CVE-2023-45235

Signed-off-by: yexiao <yexiao7@huawei.com>
2024-03-03 17:53:43 +08:00

232 lines
8.4 KiB
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From 0c7c03ee087f10d9ddda8f38d816763211f8b925 Mon Sep 17 00:00:00 2001
From: adttil <13380049+adttil@user.noreply.gitee.com>
Date: Sat, 24 Feb 2024 14:28:35 +0800
Subject: [PATCH 12/13] NetworkPkg: UefiPxeBcDxe: SECURITY PATCH CVE-2023-45235
Patch
Bug Details:
PixieFail Bug #7
CVE-2023-45235
CVSS 8.3 : CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
CWE-119 Improper Restriction of Operations within the Bounds of
a Memory Buffer
Buffer overflow when handling Server ID option from a DHCPv6 proxy
Advertise message
Change Overview:
Performs two checks
1. Checks that the length of the duid is accurate
> + //
> + // Check that the minimum and maximum requirements are met
> + //
> + if ((OpLen < PXEBC_MIN_SIZE_OF_DUID) ||
(OpLen > PXEBC_MAX_SIZE_OF_DUID)) {
> + Status = EFI_INVALID_PARAMETER;
> + goto ON_ERROR;
> + }
2. Ensures that the amount of data written to the buffer is tracked and
never exceeds that
> + //
> + // Check that the option length is valid.
> + //
> + if ((DiscoverLen + OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN)
> DiscoverLenNeeded) {
> + Status = EFI_OUT_OF_RESOURCES;
> + goto ON_ERROR;
> + }
Additional code clean up and fix for memory leak in case Option was NULL
Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
ref: https://github.com/tianocore/edk2/commit/fac297724e6cc343430cd0104e55cd7a96d1151e
Signed-off-by: yexiao yexiao7@huawei.com
---
NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c | 76 ++++++++++++++++++++++------
NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.h | 17 +++++++
2 files changed, 77 insertions(+), 16 deletions(-)
diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
index 7a20ba56..578a2615 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
@@ -883,6 +883,7 @@ PxeBcRequestBootService (
EFI_STATUS Status;
EFI_DHCP6_PACKET *IndexOffer;
UINT8 *Option;
+ UINTN DiscoverLenNeeded;
PxeBc = &Private->PxeBc;
Request = Private->Dhcp6Request;
@@ -895,7 +896,8 @@ PxeBcRequestBootService (
return EFI_DEVICE_ERROR;
}
- Discover = AllocateZeroPool (sizeof (EFI_PXE_BASE_CODE_DHCPV6_PACKET));
+ DiscoverLenNeeded = sizeof (EFI_PXE_BASE_CODE_DHCPV6_PACKET);
+ Discover = AllocateZeroPool (DiscoverLenNeeded);
if (Discover == NULL) {
return EFI_OUT_OF_RESOURCES;
}
@@ -920,16 +922,33 @@ PxeBcRequestBootService (
DHCP6_OPT_SERVER_ID
);
if (Option == NULL) {
- return EFI_NOT_FOUND;
+ Status = EFI_NOT_FOUND;
+ goto ON_ERROR;
}
//
// Add Server ID Option.
//
OpLen = NTOHS (((EFI_DHCP6_PACKET_OPTION *) Option)->OpLen);
- CopyMem (DiscoverOpt, Option, OpLen + 4);
- DiscoverOpt += (OpLen + 4);
- DiscoverLen += (OpLen + 4);
+ //
+ // Check that the minimum and maximum requirements are met
+ //
+ if ((OpLen < PXEBC_MIN_SIZE_OF_DUID) || (OpLen > PXEBC_MAX_SIZE_OF_DUID)) {
+ Status = EFI_INVALID_PARAMETER;
+ goto ON_ERROR;
+ }
+
+ //
+ // Check that the option length is valid.
+ //
+ if ((DiscoverLen + OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN) > DiscoverLenNeeded) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto ON_ERROR;
+ }
+
+ CopyMem (DiscoverOpt, Option, OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverOpt += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverLen += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
}
while (RequestLen < Request->Length) {
@@ -939,15 +958,23 @@ PxeBcRequestBootService (
OpCode != EFI_DHCP6_IA_TYPE_TA &&
OpCode != DHCP6_OPT_SERVER_ID
) {
+ //
+ // Check that the option length is valid.
+ //
+ if (DiscoverLen + OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN > DiscoverLenNeeded) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto ON_ERROR;
+ }
+
//
// Copy all the options except IA option and Server ID
//
- CopyMem (DiscoverOpt, RequestOpt, OpLen + 4);
- DiscoverOpt += (OpLen + 4);
- DiscoverLen += (OpLen + 4);
+ CopyMem (DiscoverOpt, RequestOpt, OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverOpt += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverLen += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
}
- RequestOpt += (OpLen + 4);
- RequestLen += (OpLen + 4);
+ RequestOpt += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ RequestLen += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
}
//
@@ -2135,6 +2162,7 @@ PxeBcDhcp6Discover (
UINT16 OpLen;
UINT32 Xid;
EFI_STATUS Status;
+ UINTN DiscoverLenNeeded;
PxeBc = &Private->PxeBc;
Mode = PxeBc->Mode;
@@ -2150,7 +2178,8 @@ PxeBcDhcp6Discover (
return EFI_DEVICE_ERROR;
}
- Discover = AllocateZeroPool (sizeof (EFI_PXE_BASE_CODE_DHCPV6_PACKET));
+ DiscoverLenNeeded = sizeof (EFI_PXE_BASE_CODE_DHCPV6_PACKET);
+ Discover = AllocateZeroPool (DiscoverLenNeeded);
if (Discover == NULL) {
return EFI_OUT_OF_RESOURCES;
}
@@ -2166,20 +2195,35 @@ PxeBcDhcp6Discover (
DiscoverLen = sizeof (EFI_DHCP6_HEADER);
RequestLen = DiscoverLen;
+ //
+ // The request packet is generated by the UEFI network stack. In the DHCP4 DORA and DHCP6 SARR sequence,
+ // the first (discover in DHCP4 and solicit in DHCP6) and third (request in both DHCP4 and DHCP6) are
+ // generated by the DHCP client (the UEFI network stack in this case). By the time this function executes,
+ // the DHCP sequence already has been executed once (see UEFI Specification Figures 24.2 and 24.3), with
+ // Private->Dhcp6Request being a cached copy of the DHCP6 request packet that UEFI network stack previously
+ // generated and sent.
+ //
+ // Therefore while this code looks like it could overflow, in practice it's not possible.
+ //
while (RequestLen < Request->Length) {
OpCode = NTOHS (((EFI_DHCP6_PACKET_OPTION *) RequestOpt)->OpCode);
OpLen = NTOHS (((EFI_DHCP6_PACKET_OPTION *) RequestOpt)->OpLen);
if (OpCode != EFI_DHCP6_IA_TYPE_NA &&
OpCode != EFI_DHCP6_IA_TYPE_TA) {
+ if (DiscoverLen + OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN > DiscoverLenNeeded) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto ON_ERROR;
+ }
+
//
// Copy all the options except IA option.
//
- CopyMem (DiscoverOpt, RequestOpt, OpLen + 4);
- DiscoverOpt += (OpLen + 4);
- DiscoverLen += (OpLen + 4);
+ CopyMem (DiscoverOpt, RequestOpt, OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverOpt += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ DiscoverLen += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
}
- RequestOpt += (OpLen + 4);
- RequestLen += (OpLen + 4);
+ RequestOpt += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
+ RequestLen += (OpLen + PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN);
}
Status = PxeBc->UdpWrite (
diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.h b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.h
index ae4be775..fda5f502 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.h
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.h
@@ -35,6 +35,23 @@
#define PXEBC_ADDR_START_DELIMITER '['
#define PXEBC_ADDR_END_DELIMITER ']'
+//
+// A DUID consists of a 2-octet type code represented in network byte
+// order, followed by a variable number of octets that make up the
+// actual identifier. The length of the DUID (not including the type
+// code) is at least 1 octet and at most 128 octets.
+//
+#define PXEBC_MIN_SIZE_OF_DUID (sizeof(UINT16) + 1)
+#define PXEBC_MAX_SIZE_OF_DUID (sizeof(UINT16) + 128)
+
+//
+// This define represents the combineds code and length field from
+// https://datatracker.ietf.org/doc/html/rfc3315#section-22.1
+//
+#define PXEBC_COMBINED_SIZE_OF_OPT_CODE_AND_LEN \
+ (sizeof (((EFI_DHCP6_PACKET_OPTION *)0)->OpCode) + \
+ sizeof (((EFI_DHCP6_PACKET_OPTION *)0)->OpLen))
+
#define GET_NEXT_DHCP6_OPTION(Opt) \
(EFI_DHCP6_PACKET_OPTION *) ((UINT8 *) (Opt) + \
sizeof (EFI_DHCP6_PACKET_OPTION) + (NTOHS ((Opt)->OpLen)) - 1)
--
2.33.0
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