Source: https://code.google.com/p/google-security-research/issues/detail?id=625
The following crash was encountered in pdfium (the Chrome PDF renderer) during PDF fuzzing:
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$ ./pdfium_test asan_heap-oob_d08cef_3699_8361562cacee739a7c6cb31eea735eb6
Rendering PDF file asan_heap-oob_d08cef_3699_8361562cacee739a7c6cb31eea735eb6.
Non-linearized path...
=================================================================
==28672==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61800000f7b2 at pc 0x000000ed2cac bp 0x7ffea0af5970 sp 0x7ffea0af5968
READ of size 1 at 0x61800000f7b2 thread T0
#0 0xed2cab in CPDF_DIBSource::DownSampleScanline32Bit(int, int, unsigned int, unsigned char const*, unsigned char*, int, int, int, int) const core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp:1479:64
#1 0xece99e in CPDF_DIBSource::DownSampleScanline(int, unsigned char*, int, int, int, int, int) const core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp:1277:5
#2 0x115235c in CFX_ImageStretcher::ContinueQuickStretch(IFX_Pause*) core/src/fxge/dib/fx_dib_engine.cpp:910:5
#3 0x1151805 in CFX_ImageStretcher::Continue(IFX_Pause*) core/src/fxge/dib/fx_dib_engine.cpp:834:12
#4 0x11831f8 in CFX_ImageTransformer::Continue(IFX_Pause*) core/src/fxge/dib/fx_dib_transform.cpp:409:7
#5 0x117a4a1 in CFX_ImageRenderer::Continue(IFX_Pause*) core/src/fxge/dib/fx_dib_main.cpp:1637:9
#6 0x10986a2 in CFX_AggDeviceDriver::ContinueDIBits(void*, IFX_Pause*) core/src/fxge/agg/src/fx_agg_driver.cpp:1748:10
#7 0x11a32f1 in CFX_RenderDevice::ContinueDIBits(void*, IFX_Pause*) core/src/fxge/ge/fx_ge_device.cpp:471:10
#8 0xe8f1f1 in CPDF_ImageRenderer::Continue(IFX_Pause*) core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp:869:12
#9 0xe673bf in CPDF_RenderStatus::ContinueSingleObject(CPDF_PageObject const*, CFX_Matrix const*, IFX_Pause*) core/src/fpdfapi/fpdf_render/fpdf_render.cpp:299:9
#10 0xe67eff in CPDF_RenderStatus::ContinueSingleObject(CPDF_PageObject const*, CFX_Matrix const*, IFX_Pause*) core/src/fpdfapi/fpdf_render/fpdf_render.cpp:328:12
#11 0xe76f12 in CPDF_ProgressiveRenderer::Continue(IFX_Pause*) core/src/fpdfapi/fpdf_render/fpdf_render.cpp:1152:13
#12 0xe756c1 in CPDF_ProgressiveRenderer::Start(IFX_Pause*) core/src/fpdfapi/fpdf_render/fpdf_render.cpp:1090:3
#13 0x63dbd7 in FPDF_RenderPage_Retail(CRenderContext*, void*, int, int, int, int, int, int, int, IFSDK_PAUSE_Adapter*) fpdfsdk/src/fpdfview.cpp:752:3
#14 0x63c3af in FPDF_RenderPageBitmap fpdfsdk/src/fpdfview.cpp:507:3
#15 0x4ee0df in RenderPage(std::string const&, void* const&, void* const&, int, Options const&) samples/pdfium_test.cc:374:3
#16 0x4f0af8 in RenderPdf(std::string const&, char const*, unsigned long, Options const&) samples/pdfium_test.cc:531:9
#17 0x4f16e9 in main samples/pdfium_test.cc:608:5
0x61800000f7b2 is located 0 bytes to the right of 818-byte region [0x61800000f480,0x61800000f7b2)
allocated by thread T0 here:
#0 0x4be96c in calloc llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:56
#1 0x67da0f in FX_AllocOrDie(unsigned long, unsigned long) fpdfsdk/src/../include/../../core/include/fpdfapi/../fxcrt/fx_memory.h:37:22
#2 0xe1c1d6 in CPDF_SyntaxParser::ReadStream(CPDF_Dictionary*, PARSE_CONTEXT*, unsigned int, unsigned int) core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp:2444:13
#3 0xe06543 in CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects*, unsigned int, unsigned int, PARSE_CONTEXT*, int) core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp:2171:12
#4 0xe071a4 in CPDF_Parser::ParseIndirectObjectAt(CPDF_IndirectObjects*, long, unsigned int, PARSE_CONTEXT*) core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp:1400:7
#5 0xe0897f in CPDF_Parser::ParseIndirectObject(CPDF_IndirectObjects*, unsigned int, PARSE_CONTEXT*) core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp:1195:12
#6 0xdd7c93 in CPDF_IndirectObjects::GetIndirectObject(unsigned int, PARSE_CONTEXT*) core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp:1125:12
#7 0xddafdf in CPDF_Object::GetDirect() const core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp:220:10
#8 0xde4960 in CPDF_Dictionary::GetElementValue(CFX_ByteStringC const&) const core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp:594:14
#9 0xd99b9b in CPDF_StreamContentParser::FindResourceObj(CFX_ByteStringC const&, CFX_ByteString const&) core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp:1178:25
#10 0xd8d60c in CPDF_StreamContentParser::Handle_ExecuteXObject() core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp:696:36
#11 0xd979e1 in CPDF_StreamContentParser::OnOperator(char const*) core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp:369:7
#12 0xda3491 in CPDF_StreamContentParser::Parse(unsigned char const*, unsigned int, unsigned int) core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp:56:9
#13 0xdb7d0f in CPDF_ContentParser::Continue(IFX_Pause*) core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp:1096:13
#14 0xd01db4 in CPDF_PageObjects::ContinueParse(IFX_Pause*) core/src/fpdfapi/fpdf_page/fpdf_page.cpp:693:3
#15 0xd0568d in CPDF_Page::ParseContent(CPDF_ParseOptions*, int) core/src/fpdfapi/fpdf_page/fpdf_page.cpp:874:3
#16 0x63bbe7 in FPDF_LoadPage fpdfsdk/src/fpdfview.cpp:291:3
#17 0x4edcd1 in RenderPage(std::string const&, void* const&, void* const&, int, Options const&) samples/pdfium_test.cc:352:20
#18 0x4f0af8 in RenderPdf(std::string const&, char const*, unsigned long, Options const&) samples/pdfium_test.cc:531:9
#19 0x4f16e9 in main samples/pdfium_test.cc:608:5
SUMMARY: AddressSanitizer: heap-buffer-overflow core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp:1479:64 in CPDF_DIBSource::DownSampleScanline32Bit(int, int, unsigned int, unsigned char const*, unsigned char*, int, int, int, int) const
Shadow bytes around the buggy address:
0x0c307fff9ea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff9eb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff9ec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff9ed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff9ee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c307fff9ef0: 00 00 00 00 00 00[02]fa fa fa fa fa fa fa fa fa
0x0c307fff9f00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff9f10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c307fff9f20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c307fff9f30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c307fff9f40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==28672==ABORTING
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The crash was reported at https://code.google.com/p/chromium/issues/detail?id=554151. Attached are two PDF files which trigger the crash.
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39162.zip
