New subject: [Bug 45104] OOB read in gdiplus

1 May 2018


      https://bugs.winehq.org/show_bug.cgi?id=45104
Bug ID: 45104
           Summary: OOB read in gdiplus
           Product: Wine
           Version: 3.7
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdiplus
          Assignee: wine-bugs@winehq.org
          Reporter: robert.gawlik@rub.de
      Distribution: ---
Original submitted report can be found here:
https://bugs.launchpad.net/ubuntu/+source/wine/+bug/1764719
(*) Out-of-bounds read in dlls/gdiplus/metafile.c:2528 (last commit:
dd2624a24fba400bf59b9396e496d16c43d399d9):
The parameters data, dataSize and recordType are completely user controlled and
flow into a memcpy() call in line 2528. If the length of data is less than
dataSize, then this results in an out-of-bounds read.
2461 GpStatus WINGDIPAPI GdipPlayMetafileRecord(GDIPCONST GpMetafile *metafile,
2462     EmfPlusRecordType recordType, UINT flags, UINT dataSize, GDIPCONST
BYTE *data)
2463 {
....
2471 
2472     if (recordType >= 1 && recordType <= 0x7a)
2473     {
2474         /* regular EMF record */
2475         if (metafile->playback_dc)
2476         {
2477             switch (recordType)
2478             {
....
2520             default:
2521             {
2522                 ENHMETARECORD *record = heap_alloc_zero(dataSize + 8);    
                    // <== dataSize is completely user controlled 
2523 
2524                 if (record)
2525                 {
2526                     record->iType = recordType;
2527                     record->nSize = dataSize + 8;
2528                     memcpy(record->dParm, data, dataSize);                
                    // <== data is user controlled, memcpy performs OOB read
2529 
2530                     if(PlayEnhMetaFileRecord(metafile->playback_dc,
metafile->handle_table,    
2531                             record, metafile->handle_count) == 0)         
                    // (record is user controlled => source of many
vulnerabilities)
2532                         ERR("PlayEnhMetaFileRecord failed\n");
If you need more information (EMF trigger file, etc.) let me know!
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[Bug 45104] New: OOB read in gdiplus