On 08/18/20 04:10, Wang, Jian J wrote: Laszlo,
My apologies for the slow response. I'm not the original reporter but just the BZ submitter. And I didn't do deep analysis to this issue. The issues was reported from one internal team. Add John in loop to see if he knows more about it or not.
My superficial understanding on such issue is that, if there's "potential" issue in theory and hard to reproduce, it's still worthy of using an alternative way to replace the original implementation with no "potential" issue at all. Maybe we don't have to prove old way is something wrong but must prove that the new way is really safe. I agree, thanks. It would be nice to hear more from the internal team about the originally reported (even if hard-to-trigger) issue. Thanks! Laszlo Regards, Jian
-----Original Message----- From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Laszlo Ersek Sent: Tuesday, August 18, 2020 12:53 AM To: Yao, Jiewen <jiewen.yao@...>; devel@edk2.groups.io; xiewenyi2@...; Wang, Jian J <jian.j.wang@...> Cc: huangming23@...; songdongkuang@... Subject: Re: [edk2-devel] [PATCH EDK2 v2 1/1] SecurityPkg/DxeImageVerificationLib:Enhanced verification of Offset
Hi Jiewen,
On 08/14/20 10:53, Yao, Jiewen wrote:
To Jiewen, Sorry, I don't have environment to reproduce the issue. Please help me understand, if you don’t have environment to reproduce the issue, how do you guarantee that your patch does fix the problem and we don’t have any other vulnerabilities?
The original bug report in <https://bugzilla.tianocore.org/show_bug.cgi?id=2215#c0> is seriously lacking. It does not go into detail about the alleged integer overflow. It does not quote the code, does not explain the control flow, does not identify the exact edk2 commit at which the vulnerability exists.
The bug report also does not offer a reproducer.
Additionally, the exact statement that the bug report does make, namely
it's possible to overflow Offset back to 0 causing an endless loop
is wrong (as far as I can tell anyway). It is not "OffSet" that can be overflowed to zero, but the *addend* that is added to OffSet can be overflowed to zero. Therefore the infinite loop will arise because OffSet remains stuck at its present value, and not because OffSet will be re-set to zero.
For the reasons, we can only speculate as to what the actual problem is, unless Jian decides to join the discussion and clarifies what he had in mind originally.
My understanding (or even "reconstruction") of the vulnerability is described above, and in the patches that I proposed.
We can write a patch based on code analysis. It's possible to identify integer overflows based on code analysis, and it's possible to verify the correctness of fixes by code review. Obviously testing is always good, but many times, constructing reproducers for such issues that were found by code review, is difficult and time consuming. We can say that we don't fix vulnerabilities without reproducers, or we can say that we make an effort to fix them even if all we have is code analysis (and not a reproducer).
So the above paragraph concerns "correctness". Regarding "completeness", I guarantee you that this patch does not fix *all* problems related to PE parsing. (See the other BZ tickets.) It does fix *one* issue with PE parsing. We can say that we try to fix such issues gradually (give different CVE numbers to different issues, and address them one at a time), or we can say that we rewrite PE parsing from the ground up. (BTW: I have seriously attempted that in the past, and I gave up, because the PE format is FUBAR.)
In summary:
- the problem statement is unclear,
- it seems like there is indeed an integer overflow problem in the SecDataDir parsing loop, but it's uncertain whether the bug reporter had exactly that in mind
- PE parsing is guaranteed to have other vulnerabilities elsewhere in edk2, but I'm currently unaware of other such issues in DxeImageVerificationLib specifically
- even if there are other such problems (in DxeImageVerificationLib or elswehere), fixing this bug that we know about is likely worthwhile
- for many such bugs, constructing a reproducer is difficult and time consuming; code analysis, and *regression-testing* are frequently the only tools we have. That doesn't mean we should ignore this class of bugs.
(Fixing integer overflows retro-actively is more difficult than writing overflow-free code in the first place, but that ship has sailed; so we can only fight these bugs incrementally now, unless we can rewrite PE parsing with a new data structure from the ground up. Again I tried that and gave up, because the spec is not public, and what I did manage to learn about PE, showed that it was insanely over-engineered. I'm not saying that other binary / executable formats are better, of course.)
Please check out my patches (inlined elsewhere in this thread), and comment whether you'd like me to post them to the list as a standalone series.
Jian: it wouldn't hurt if you commented as well.
Thanks Laszlo
-----Original Message----- From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of wenyi,xie
via groups.io Sent: Friday, August 14, 2020 3:54 PM To: Laszlo Ersek <lersek@...>; devel@edk2.groups.io; Yao, Jiewen <jiewen.yao@...>; Wang, Jian J <jian.j.wang@...> Cc: huangming23@...; songdongkuang@... Subject: Re: [edk2-devel] [PATCH EDK2 v2 1/1] SecurityPkg/DxeImageVerificationLib:Enhanced verification of Offset
To Laszlo, Thank you for your detailed description, I agree with what you analyzed and I'm
OK with your patches, it's correct and much simpler.
To Jiewen, Sorry, I don't have environment to reproduce the issue.
Thanks Wenyi
On 2020/8/14 2:50, Laszlo Ersek wrote:
On 08/13/20 13:55, Wenyi Xie wrote:
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2215
There is an integer overflow vulnerability in DxeImageVerificationHandler function when parsing the PE files attribute certificate table. In cases where WinCertificate->dwLength is sufficiently large, it's possible to overflow Offset back to 0 causing an endless loop.
Check offset inbetween VirtualAddress and VirtualAddress + Size. Using SafeintLib to do offset addition with result check.
Cc: Jiewen Yao <jiewen.yao@...> Cc: Jian J Wang <jian.j.wang@...> Cc: Laszlo Ersek <lersek@...> Signed-off-by: Wenyi Xie <xiewenyi2@...> --- SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf |
1 +
SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h
|
1 +
SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
|
111 +++++++++++---------
3 files changed, 63 insertions(+), 50 deletions(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf
index 1e1a639857e0..a7ac4830b3d4 100644 --- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf
@@ -53,6 +53,7 @@ [LibraryClasses] SecurityManagementLib PeCoffLib TpmMeasurementLib + SafeIntLib
[Protocols] gEfiFirmwareVolume2ProtocolGuid ## SOMETIMES_CONSUMES diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h
index 17955ff9774c..060273917d5d 100644 --- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h
@@ -23,6 +23,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent #include <Library/DevicePathLib.h> #include <Library/SecurityManagementLib.h> #include <Library/PeCoffLib.h> +#include <Library/SafeIntLib.h> #include <Protocol/FirmwareVolume2.h> #include <Protocol/DevicePath.h> #include <Protocol/BlockIo.h> diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 36b87e16d53d..dbc03e28c05b 100644 ---
a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -1658,6 +1658,10 @@ DxeImageVerificationHandler ( EFI_STATUS HashStatus; EFI_STATUS DbStatus; BOOLEAN IsFound; + UINT32 AlignedLength; + UINT32 Result; + EFI_STATUS AddStatus; + BOOLEAN IsAuthDataAssigned;
SignatureList = NULL; SignatureListSize = 0; @@ -1667,6 +1671,7 @@ DxeImageVerificationHandler ( Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED; IsVerified = FALSE; IsFound = FALSE; + Result = 0;
// // Check the image type and get policy setting. @@ -1850,9 +1855,10 @@ DxeImageVerificationHandler ( // The first certificate starts at offset (SecDataDir->VirtualAddress) from
the
start of the file.
// for (OffSet = SecDataDir->VirtualAddress; - OffSet < (SecDataDir->VirtualAddress + SecDataDir->Size); - OffSet += (WinCertificate->dwLength + ALIGN_SIZE (WinCertificate- dwLength))) {
+ (OffSet >= SecDataDir->VirtualAddress) && (OffSet < (SecDataDir- VirtualAddress + SecDataDir->Size));) {
+ IsAuthDataAssigned = FALSE; WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); + AlignedLength = WinCertificate->dwLength + ALIGN_SIZE
(WinCertificate-
dwLength);
I disagree with this patch.
The primary reason for my disagreement is that the bug report <https://bugzilla.tianocore.org/show_bug.cgi?id=2215#c0> is inexact, and so this patch tries to fix the wrong thing.
With edk2 master at commit 65904cdbb33c, it is *not* possible to overflow the OffSet variable to zero with "WinCertificate->dwLength" *purely*, and cause an endless loop. Note that we have (at commit 65904cdbb33c):
for (OffSet = SecDataDir->VirtualAddress; OffSet < (SecDataDir->VirtualAddress + SecDataDir->Size); OffSet += (WinCertificate->dwLength + ALIGN_SIZE (WinCertificate- dwLength))) { WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); if ((SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) <= sizeof (WIN_CERTIFICATE) ||
(SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) <
WinCertificate-
dwLength) { break; }
The last sub-condition checks whether the Security Data Directory has enough room left for "WinCertificate->dwLength". If not, then we break out of the loop.
If we *do* have enough room, that is:
(SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) >=
WinCertificate-
dwLength
then we have (by adding OffSet to both sides):
SecDataDir->VirtualAddress + SecDataDir->Size >= OffSet + WinCertificate- dwLength
The left hand side is a known-good UINT32, and so incrementing OffSet (a UINT32) *solely* by "WinCertificate->dwLength" (also a UINT32) does not cause an overflow.
Instead, the problem is with the alignment. The "if" statement checks whether we have enough room for "dwLength", but then "OffSet" is advanced by "dwLength" *aligned up* to the next multiple of 8. And that may indeed cause various overflows.
Now, the main problem with the present patch is that it does not fix one of those overflows. Namely, consider that "dwLength" is very close to MAX_UINT32 (or even think it's exactly MAX_UINT32). Then aligning it up to the next multiple of 8 will yield 0. In other words, "AlignedLength" will be zero.
And when that happens, there's going to be an infinite loop just the same: "OffSet" will not be zero, but it will be *stuck*. The SafeUint32Add() call at the bottom will succeed, but it will not change the value of "OffSet".
More at the bottom.
if ((SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) <= sizeof (WIN_CERTIFICATE) ||
(SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) < WinCertificate->dwLength) {
break; @@ -1872,6 +1878,8 @@ DxeImageVerificationHandler ( } AuthData = PkcsCertData->CertData; AuthDataSize = PkcsCertData->Hdr.dwLength - sizeof(PkcsCertData-
Hdr);
+ IsAuthDataAssigned = TRUE; + HashStatus = HashPeImageByType (AuthData, AuthDataSize); } else if (WinCertificate->wCertificateType ==
WIN_CERT_TYPE_EFI_GUID)
{
// // The certificate is formatted as WIN_CERTIFICATE_UEFI_GUID which
is
described in UEFI Spec.
@@ -1880,72 +1888,75 @@ DxeImageVerificationHandler ( if (WinCertUefiGuid->Hdr.dwLength <= OFFSET_OF(WIN_CERTIFICATE_UEFI_GUID, CertData)) {
break; } - if (!CompareGuid (&WinCertUefiGuid->CertType, &gEfiCertPkcs7Guid))
{
- continue; + if (CompareGuid (&WinCertUefiGuid->CertType, &gEfiCertPkcs7Guid))
{
+ AuthData = WinCertUefiGuid->CertData; + AuthDataSize = WinCertUefiGuid->Hdr.dwLength - OFFSET_OF(WIN_CERTIFICATE_UEFI_GUID, CertData);
+ IsAuthDataAssigned = TRUE; + HashStatus = HashPeImageByType (AuthData, AuthDataSize); } - AuthData = WinCertUefiGuid->CertData; - AuthDataSize = WinCertUefiGuid->Hdr.dwLength - OFFSET_OF(WIN_CERTIFICATE_UEFI_GUID, CertData);
} else { if (WinCertificate->dwLength < sizeof (WIN_CERTIFICATE)) { break; } - continue; }
- HashStatus = HashPeImageByType (AuthData, AuthDataSize); - if (EFI_ERROR (HashStatus)) { - continue; - } - - // - // Check the digital signature against the revoked certificate in
forbidden
database (dbx).
- // - if (IsForbiddenByDbx (AuthData, AuthDataSize)) { - Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FAILED; - IsVerified = FALSE; - break; - } - - // - // Check the digital signature against the valid certificate in allowed database (db).
- // - if (!IsVerified) { - if (IsAllowedByDb (AuthData, AuthDataSize)) { - IsVerified = TRUE; + if (IsAuthDataAssigned && !EFI_ERROR (HashStatus)) { + // + // Check the digital signature against the revoked certificate in
forbidden
database (dbx).
+ // + if (IsForbiddenByDbx (AuthData, AuthDataSize)) { + Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FAILED; + IsVerified = FALSE; + break; } - }
- // - // Check the image's hash value. - // - DbStatus = IsSignatureFoundInDatabase ( - EFI_IMAGE_SECURITY_DATABASE1, - mImageDigest, - &mCertType, - mImageDigestSize, - &IsFound - ); - if (EFI_ERROR (DbStatus) || IsFound) { - Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND; - DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed
but %s
hash of image is found in DBX.\n", mHashTypeStr));
- IsVerified = FALSE; - break; - } + // + // Check the digital signature against the valid certificate in allowed database (db).
+ // + if (!IsVerified) { + if (IsAllowedByDb (AuthData, AuthDataSize)) { + IsVerified = TRUE; + } + }
- if (!IsVerified) { + // + // Check the image's hash value. + // DbStatus = IsSignatureFoundInDatabase ( - EFI_IMAGE_SECURITY_DATABASE, + EFI_IMAGE_SECURITY_DATABASE1, mImageDigest, &mCertType, mImageDigestSize, &IsFound ); - if (!EFI_ERROR (DbStatus) && IsFound) { - IsVerified = TRUE; - } else { - DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed
but
signature is not allowed by DB and %s hash of image is not found in DB/DBX.\n",
mHashTypeStr));
+ if (EFI_ERROR (DbStatus) || IsFound) { + Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND; + DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but %s hash of image is found in DBX.\n", mHashTypeStr));
+ IsVerified = FALSE; + break; } + + if (!IsVerified) { + DbStatus = IsSignatureFoundInDatabase ( + EFI_IMAGE_SECURITY_DATABASE, + mImageDigest, + &mCertType, + mImageDigestSize, + &IsFound + ); + if (!EFI_ERROR (DbStatus) && IsFound) { + IsVerified = TRUE; + } else { + DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed
but
signature is not allowed by DB and %s hash of image is not found in DB/DBX.\n",
mHashTypeStr));
+ } + } + } + + AddStatus = SafeUint32Add (OffSet, AlignedLength, &Result); + if (EFI_ERROR (AddStatus)) { + break; } + OffSet = Result; }
if (OffSet != (SecDataDir->VirtualAddress + SecDataDir->Size)) {
There are other (smaller) reasons why I dislike this patch:
- The "IsAuthDataAssigned" variable is superfluous; we could use the existent "AuthData" variable (with a NULL-check and a NULL-assignment) similarly.
- The patch complicates / reorganizes the control flow needlessly. This complication originates from placing the checked "OffSet" increment at the bottom of the loop, which then requires the removal of all the "continue" statements. But we don't need to check-and-increment at the bottom. We can keep the increment inside the "for" statement, only extend the *existent* room check (which I've quoted) to take the alignment into account as well. If there is enough room for the alignment in the security data directory, then that guarantees there won't be a UINT32 overflow either.
All in all, I'm proposing the following three patches instead. The first two patches are preparation, the last patch is the fix.
Patch#1:
From 11af0a104d34d39bf1b1aab256428ae4edbddd77 Mon Sep 17
00:00:00
2001
From: Laszlo Ersek <lersek@...> Date: Thu, 13 Aug 2020 19:11:39 +0200 Subject: [PATCH 1/3] SecurityPkg/DxeImageVerificationLib: extract SecDataDirEnd, SecDataDirLeft
The following two quantities:
SecDataDir->VirtualAddress + SecDataDir->Size SecDataDir->VirtualAddress + SecDataDir->Size - OffSet
are used multiple times in DxeImageVerificationHandler(). Introduce helper variables for them: "SecDataDirEnd" and "SecDataDirLeft", respectively. This saves us multiple calculations and significantly simplifies the code.
Note that all three summands above have type UINT32, therefore the new variables are also of type UINT32.
This patch does not change behavior.
(Note that the code already handles the case when the
SecDataDir->VirtualAddress + SecDataDir->Size
UINT32 addition overflows -- namely, in that case, the certificate loop is never entered, and the corruption check right after the loop fires.)
Signed-off-by: Laszlo Ersek <lersek@...> --- SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c |
12
++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 36b87e16d53d..8761980c88aa 100644 ---
a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -1652,6 +1652,8 @@ DxeImageVerificationHandler ( UINT8 *AuthData; UINTN AuthDataSize; EFI_IMAGE_DATA_DIRECTORY *SecDataDir; + UINT32 SecDataDirEnd; + UINT32 SecDataDirLeft; UINT32 OffSet; CHAR16 *NameStr; RETURN_STATUS PeCoffStatus; @@ -1849,12 +1851,14 @@ DxeImageVerificationHandler ( // "Attribute Certificate Table". // The first certificate starts at offset (SecDataDir->VirtualAddress) from
the
start of the file.
// + SecDataDirEnd = SecDataDir->VirtualAddress + SecDataDir->Size; for (OffSet = SecDataDir->VirtualAddress; - OffSet < (SecDataDir->VirtualAddress + SecDataDir->Size); + OffSet < SecDataDirEnd; OffSet += (WinCertificate->dwLength + ALIGN_SIZE (WinCertificate- dwLength))) {
WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); - if ((SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) <= sizeof (WIN_CERTIFICATE) ||
- (SecDataDir->VirtualAddress + SecDataDir->Size - OffSet) < WinCertificate->dwLength) {
+ SecDataDirLeft = SecDataDirEnd - OffSet; + if (SecDataDirLeft <= sizeof (WIN_CERTIFICATE) || + SecDataDirLeft < WinCertificate->dwLength) { break; }
@@ -1948,7 +1952,7 @@ DxeImageVerificationHandler ( } }
- if (OffSet != (SecDataDir->VirtualAddress + SecDataDir->Size)) { + if (OffSet != SecDataDirEnd) { // // The Size in Certificate Table or the attribute certificate table is
corrupted.
// -- 2.19.1.3.g30247aa5d201
Patch#2:
From 72012c065a53582f7df695e7b9730c45f49226c6 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@...> Date: Thu, 13 Aug 2020 19:19:06 +0200 Subject: [PATCH 2/3] SecurityPkg/DxeImageVerificationLib: assign WinCertificate after size check
Currently the (SecDataDirLeft <= sizeof (WIN_CERTIFICATE)) check only guards the de-referencing of the "WinCertificate" pointer. It does not guard the calculation of hte pointer itself:
WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet);
This is wrong; if we don't know for sure that we have enough room for a WIN_CERTIFICATE, then even creating such a pointer, not just de-referencing it, may invoke undefined behavior.
Move the pointer calculation after the size check.
Signed-off-by: Laszlo Ersek <lersek@...> --- SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c |
8
+++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 8761980c88aa..461ed7cfb5ac 100644 ---
a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -1855,10 +1855,12 @@ DxeImageVerificationHandler ( for (OffSet = SecDataDir->VirtualAddress; OffSet < SecDataDirEnd; OffSet += (WinCertificate->dwLength + ALIGN_SIZE (WinCertificate- dwLength))) {
- WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); SecDataDirLeft = SecDataDirEnd - OffSet; - if (SecDataDirLeft <= sizeof (WIN_CERTIFICATE) || - SecDataDirLeft < WinCertificate->dwLength) { + if (SecDataDirLeft <= sizeof (WIN_CERTIFICATE)) { + break; + } + WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); + if (SecDataDirLeft < WinCertificate->dwLength) { break; }
-- 2.19.1.3.g30247aa5d201
Patch#3:
From 0bbba15b84f8f9f2cdc770a89f418aaec6cfb31e Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@...> Date: Thu, 13 Aug 2020 19:34:33 +0200 Subject: [PATCH 3/3] SecurityPkg/DxeImageVerificationLib: catch
alignment
overflow (CVE-2019-14562)
The DxeImageVerificationHandler() function currently checks whether "SecDataDir" has enough room for "WinCertificate->dwLength". However, for
advancing "OffSet", "WinCertificate->dwLength" is aligned to the next multiple of 8. If "WinCertificate->dwLength" is large enough, the alignment will return 0, and "OffSet" will be stuck at the same value.
Check whether "SecDataDir" has room left for both "WinCertificate->dwLength" and the alignment.
Signed-off-by: Laszlo Ersek <lersek@...> --- SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c |
4
+++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 461ed7cfb5ac..e38eb981b7a0 100644 ---
a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -1860,7 +1860,9 @@ DxeImageVerificationHandler ( break; } WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet); - if (SecDataDirLeft < WinCertificate->dwLength) { + if (SecDataDirLeft < WinCertificate->dwLength || + (SecDataDirLeft - WinCertificate->dwLength < + ALIGN_SIZE (WinCertificate->dwLength))) { break; }
-- 2.19.1.3.g30247aa5d201
If Wenyi and the reviewers are OK with these patches, I can submit them as a standalone patch series.
Note that I do not have any reproducer for the issue; the best testing that I could offer would be some light-weight Secure Boot regression tests.
Thanks Laszlo
.
|