Package: release.debian.org
Severity: normal
Tags: buster
User: release.debian....@packages.debian.org
Usertags: pu
[ Reason ]
I'd like to fix CVE-2019-14562 in edk2 for buster.
[ Impact ]
Vulnerability to an integer overflow when parsing signatures of a specially
crafted PE file.
[ Tests ]
Regression tested only using the autopkgtests from the unstable version
of the package.
[ Risks ]
A regression could break the booting of QEMU-emulated machines.
[ Checklist ]
[X] *all* changes are documented in the d/changelog
[X] I reviewed all changes and I approve them
[X] attach debdiff against the package in (old)stable
[X] the issue is verified as fixed in unstable
[ Changes ]
Cherry-picks from upstream to resolve CVE-2019-14562.
[ Other info ]
N/A
-- System Information:
Debian Release: bullseye/sid
APT prefers unstable-debug
APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1,
'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.8.0-1-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
diff -Nru edk2-0~20181115.85588389/debian/changelog
edk2-0~20181115.85588389/debian/changelog
--- edk2-0~20181115.85588389/debian/changelog 2020-04-23 13:33:06.000000000
-0600
+++ edk2-0~20181115.85588389/debian/changelog 2020-09-17 13:45:52.000000000
-0600
@@ -1,3 +1,13 @@
+edk2 (0~20181115.85588389-3+deb10u2) buster; urgency=medium
+
+ * Fix integer overflow in DxeImageVerificationHandler. (CVE-2019-14562)
+ (Closes: #968819)
+ - d/p/0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
+ - d/p/0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
+ - d/p/0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
+
+ -- dann frazier <da...@debian.org> Thu, 17 Sep 2020 13:45:52 -0600
+
edk2 (0~20181115.85588389-3+deb10u1) buster; urgency=medium
* Fix numeric truncation in S3BootScript[Save]*() API. (CVE-2019-14563)
diff -Nru
edk2-0~20181115.85588389/debian/patches/0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
edk2-0~20181115.85588389/debian/patches/0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
---
edk2-0~20181115.85588389/debian/patches/0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
1969-12-31 17:00:00.000000000 -0700
+++
edk2-0~20181115.85588389/debian/patches/0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
2020-09-17 13:45:52.000000000 -0600
@@ -0,0 +1,87 @@
+From 503248ccdf45c14d4040ce44163facdc212e4991 Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <ler...@redhat.com>
+Date: Tue, 1 Sep 2020 11:12:19 +0200
+Subject: [PATCH 1/3] SecurityPkg/DxeImageVerificationLib: extract
+ SecDataDirEnd, SecDataDirLeft
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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.)
+
+Cc: Jian J Wang <jian.j.w...@intel.com>
+Cc: Jiewen Yao <jiewen....@intel.com>
+Cc: Min Xu <min.m...@intel.com>
+Cc: Wenyi Xie <xiewen...@huawei.com>
+Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Signed-off-by: Laszlo Ersek <ler...@redhat.com>
+Message-Id: <20200901091221.20948-2-ler...@redhat.com>
+Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
+Tested-by: Wenyi Xie <xiewen...@huawei.com>
+Reviewed-by: Min M Xu <min.m...@intel.com>
+Reviewed-by: Jiewen Yao <jiewen....@intel.com>
+
+Origin:
https://github.com/tianocore/edk2/commit/503248ccdf45c14d4040ce44163facdc212e4991
+Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Bug-Debian: https://bugs.debian.org/968819
+Last-Update: 2020-09-17
+
+Index:
edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+===================================================================
+---
edk2.orig/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
++++ edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+@@ -1658,6 +1658,8 @@ DxeImageVerificationHandler (
+ UINT8 *AuthData;
+ UINTN AuthDataSize;
+ EFI_IMAGE_DATA_DIRECTORY *SecDataDir;
++ UINT32 SecDataDirEnd;
++ UINT32 SecDataDirLeft;
+ UINT32 OffSet;
+ CHAR16 *NameStr;
+ EFI_STATUS DbStatus;
+@@ -1855,12 +1857,14 @@ 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;
+ }
+
+@@ -1952,7 +1956,7 @@ DxeImageVerificationHandler (
+ }
+ }
+
+- if (OffSet != (SecDataDir->VirtualAddress + SecDataDir->Size)) {
++ if (OffSet != SecDataDirEnd) {
+ //
+ // The Size in Certificate Table or the attribute certicate table is
corrupted.
+ //
diff -Nru
edk2-0~20181115.85588389/debian/patches/0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
edk2-0~20181115.85588389/debian/patches/0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
---
edk2-0~20181115.85588389/debian/patches/0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
1969-12-31 17:00:00.000000000 -0700
+++
edk2-0~20181115.85588389/debian/patches/0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
2020-09-17 13:45:52.000000000 -0600
@@ -0,0 +1,58 @@
+From a7632e913c1c106f436aefd5e76c394249c383a8 Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <ler...@redhat.com>
+Date: Tue, 1 Sep 2020 11:12:20 +0200
+Subject: [PATCH 2/3] SecurityPkg/DxeImageVerificationLib: assign
+ WinCertificate after size check
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Currently the (SecDataDirLeft <= sizeof (WIN_CERTIFICATE)) check only
+guards the de-referencing of the "WinCertificate" pointer. It does not
+guard the calculation of the 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.
+
+Cc: Jian J Wang <jian.j.w...@intel.com>
+Cc: Jiewen Yao <jiewen....@intel.com>
+Cc: Min Xu <min.m...@intel.com>
+Cc: Wenyi Xie <xiewen...@huawei.com>
+Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Signed-off-by: Laszlo Ersek <ler...@redhat.com>
+Message-Id: <20200901091221.20948-3-ler...@redhat.com>
+Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
+Tested-by: Wenyi Xie <xiewen...@huawei.com>
+Reviewed-by: Min M Xu <min.m...@intel.com>
+Reviewed-by: Jiewen Yao <jiewen....@intel.com>
+
+Origin:
https://github.com/tianocore/edk2/commit/a7632e913c1c106f436aefd5e76c394249c383a8
+Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Bug-Debian: https://bugs.debian.org/968819
+Last-Update: 2020-09-17
+
+Index:
edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+===================================================================
+---
edk2.orig/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
++++ edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+@@ -1861,10 +1861,12 @@ 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;
+ }
+
diff -Nru
edk2-0~20181115.85588389/debian/patches/0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
edk2-0~20181115.85588389/debian/patches/0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
---
edk2-0~20181115.85588389/debian/patches/0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
1969-12-31 17:00:00.000000000 -0700
+++
edk2-0~20181115.85588389/debian/patches/0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
2020-09-17 13:45:52.000000000 -0600
@@ -0,0 +1,50 @@
+From 0b143fa43e92be15d11e22f80773bcb1b2b0608f Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <ler...@redhat.com>
+Date: Tue, 1 Sep 2020 11:12:21 +0200
+Subject: [PATCH 3/3] SecurityPkg/DxeImageVerificationLib: catch alignment
+ overflow (CVE-2019-14562)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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.
+
+Cc: Jian J Wang <jian.j.w...@intel.com>
+Cc: Jiewen Yao <jiewen....@intel.com>
+Cc: Min Xu <min.m...@intel.com>
+Cc: Wenyi Xie <xiewen...@huawei.com>
+Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Signed-off-by: Laszlo Ersek <ler...@redhat.com>
+Message-Id: <20200901091221.20948-4-ler...@redhat.com>
+Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
+Tested-by: Wenyi Xie <xiewen...@huawei.com>
+Reviewed-by: Min M Xu <min.m...@intel.com>
+Reviewed-by: Jiewen Yao <jiewen....@intel.com>
+
+Origin:
https://github.com/tianocore/edk2/commit/0b143fa43e92be15d11e22f80773bcb1b2b0608f
+Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=2215
+Bug-Debian: https://bugs.debian.org/968819
+Last-Update: 2020-09-17
+
+Index:
edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+===================================================================
+---
edk2.orig/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
++++ edk2/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+@@ -1866,7 +1866,9 @@ DxeImageVerificationHandler (
+ break;
+ }
+ WinCertificate = (WIN_CERTIFICATE *) (mImageBase + OffSet);
+- if (SecDataDirLeft < WinCertificate->dwLength) {
++ if (SecDataDirLeft < WinCertificate->dwLength ||
++ (SecDataDirLeft - WinCertificate->dwLength <
++ ALIGN_SIZE (WinCertificate->dwLength))) {
+ break;
+ }
+
diff -Nru edk2-0~20181115.85588389/debian/patches/series
edk2-0~20181115.85588389/debian/patches/series
--- edk2-0~20181115.85588389/debian/patches/series 2020-04-22
17:03:10.000000000 -0600
+++ edk2-0~20181115.85588389/debian/patches/series 2020-09-17
13:45:52.000000000 -0600
@@ -24,3 +24,6 @@
0015-SecurityPkg-DxeImageVerificationLib-Differentiate-er.patch
0016-SecurityPkg-DxeImageVerificationLib-change-IsCertHas.patch
0017-NetworkPkg-ArpDxe-Recycle-invalid-ARP-packets-CVE-20.patch
+0001-SecurityPkg-DxeImageVerificationLib-extract-SecDataD.patch
+0002-SecurityPkg-DxeImageVerificationLib-assign-WinCertif.patch
+0003-SecurityPkg-DxeImageVerificationLib-catch-alignment-.patch
