Package: Inkscape
Version: 1.1
ZDI-CAN-14599: Inkscape WMF File Parsing Out-Of-Bounds Read Information
Disclosure Vulnerability
-- CVSS -----------------------------------------
3.3: AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
-- ABSTRACT -------------------------------------
Trend Micro's Zero Day Initiative has identified a vulnerability affecting the
following products:
Inkscape - Inkscape
-- VULNERABILITY DETAILS ------------------------
* Version tested: 1.1
* Installer file: inkscape-1.1-x86.exe
* Platform tested: Win 10 19041.1.amd64fre.vb_release.191206-1406
---
### Analysis
Without page heap, app sometimes hangs forever when loading PoC.
Sometimes it loads the PoC successfully.
So set page heap on Inkscape.exe.
Load PoC.
```
(cc0.3ec): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** WARNING: Unable to verify timestamp for C:\Program Files
(x86)\Inkscape\bin\libinkscape_base.dll
eax=0000000a ebx=0015fcae ecx=013f7ce2 edx=238f0000 esi=23790378 edi=23790366
eip=76bc13f9 esp=013fe7e8 ebp=013fe838 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210206
gdi32full!SetWinMetaFileBits+0xe9:
76bc13f9 66030a add cx,word ptr [edx] ds:002b:238f0000=????
0:000> kv
# ChildEBP RetAddr Args to Child
00 013fe838 717e593c 0015fcae 23790366 8c010de9
gdi32full!SetWinMetaFileBits+0xe9 (FPO: [4,17,4])
WARNING: Stack unwind information not available. Following frames may be wrong.
01 013fe8c4 72c57c55 00000009 013fe8f8 01400000
libinkscape_base!ZN8Inkscape2UI6Dialog23FileSaveDialogImplWin3224GetSaveFileName_hookprocEP6HWND__jjl+0x89c
02 013fe8d4 717ea61e 00000009 013fe8b4 772078fd
verifier!AVrfpDphExitHeapPath+0x15 (FPO: [Non-Fpo])
03 013fe8e0 772078fd 013fe9a8 771fad20 10cc2d58
libinkscape_base!ZN8Inkscape2UI6Dialog23FileOpenDialogImplWin324showEv+0x16e
04 013fe950 72c71c9b 146be418 000002a8 06290000
ntdll!RtlpFreeHeapInternal+0x783 (FPO: [Non-Fpo])
05 013fe9b8 77059bf3 06290000 00000000 146be418
verifier!AVrfpRtlFreeHeap+0x16b (FPO: [Non-Fpo])
06 013fea00 72c7278f 72c7275a a764916d 00000000 KERNELBASE!LocalFree+0x53
(FPO: [SEH])
07 013fea04 72c7275a a764916d 00000000 146be418
verifier!AVrfpLocalFree+0x8f (FPO: [SEH])
08 00000000 00000000 00000000 00000000 00000000
verifier!AVrfpLocalFree+0x5a (FPO: [Non-Fpo])
0:000> !heap -p -a edx
address 238f0000 found in
_DPH_HEAP_ROOT @ 9411000
in busy allocation ( DPH_HEAP_BLOCK: UserAddr UserSize -
VirtAddr VirtSize)
9414ac4: 23790350 15fcae -
23790000 161000
72c5a8b0 verifier!AVrfDebugPageHeapAllocate+0x00000240
7725f04e ntdll!RtlDebugAllocateHeap+0x00000039
771c70d0 ntdll!RtlpAllocateHeap+0x000000f0
771c6e2c ntdll!RtlpAllocateHeapInternal+0x0000104c
771c5dce ntdll!RtlAllocateHeap+0x0000003e
72c71a87 verifier!AVrfpRtlAllocateHeap+0x000000b7
76747580 msvcrt!malloc+0x00000090
72c727c8 verifier!AVrfp_malloc+0x00000038
717e5888
libinkscape_base!ZN8Inkscape2UI6Dialog23FileSaveDialogImplWin3224GetSaveFileName_hookprocEP6HWND__jjl+0x000007e8
```
Vulnerable code:
```
.text:717E5911 call ds:GetDC
.text:717E5917 sub esp, 4
.text:717E591A mov ebp, eax
.text:717E591C lea eax, [esp+25Ch+MFP]
.text:717E5920 mov [esp+25Ch+lpData], ebp ; hdcRef
.text:717E5924 mov [esp+25Ch+lpSecurityAttributes], eax ;
lpMFP
.text:717E5928 lea eax, [edi+16h]
.text:717E592B mov [esp+25Ch+cbBuffer], eax ; lpMeta16Data
.text:717E592F mov eax, [esp+25Ch+nNumberOfBytesToRead]
.text:717E5933 mov [esp+25Ch+lpName], eax ; nSize
.text:717E5936 call ds:SetWinMetaFileBits
```
Our of bounds read.
Information disclosure.
Metadata:
```
0:000> vertarget
Windows 10 Version 19043 MP (2 procs) Free x86 compatible
Product: WinNt, suite: SingleUserTS
Edition build lab: 19041.1.amd64fre.vb_release.191206-1406
Build layer: ->
Build layer: ->
Build layer: ->
Machine Name:
Debug session time: Fri Jul 9 17:46:05.435 2021 (UTC - 7:00)
System Uptime: 2 days 6:09:38.434
Process Uptime: 0 days 0:00:06.157
Kernel time: 0 days 0:00:00.171
User time: 0 days 0:00:00.000
0:000> lmvm inkscape
Browse full module list
start end module name
00980000 009d7000 inkscape T (no symbols)
Loaded symbol image file: C:\Program Files (x86)\Inkscape\bin\inkscape.exe
Image path: C:\Program Files (x86)\Inkscape\bin\inkscape.exe
Image name: inkscape.exe
Browse all global symbols functions data
Timestamp: unavailable (00000000)
CheckSum: 0005AAB9
ImageSize: 00057000
File version: 1.1.0.0
Product version: 1.1.0.0
File flags: 0 (Mask 0)
File OS: 40004 NT Win32
File type: 1.0 App
File date: 00000000.00000000
Translations: 0409.04e4
Information from resource tables:
CompanyName: Inkscape project
ProductName: Inkscape
InternalName: Inkscape
OriginalFilename: inkscape.exe
ProductVersion: 1.1
FileVersion: 1.1
FileDescription: Inkscape vector graphics editor
LegalCopyright: �� 2021 Inkscape project
Comments: Published under the GNU GPL
0:000> lmvm libinkscape_base
Browse full module list
start end module name
710d0000 72607000 libinkscape_base (deferred)
Image path: C:\Program Files (x86)\Inkscape\bin\libinkscape_base.dll
Image name: libinkscape_base.dll
Browse all global symbols functions data
Timestamp: unavailable (00000000)
CheckSum: 01523E95
ImageSize: 01537000
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
Information from resource tables:
```
-- CREDIT ---------------------------------------
This vulnerability was discovered by:
khangkito of Trend Micro Zero Day Initiative
-- FURTHER DETAILS ------------------------------
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