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"Oracle Java Runtime Environment - Heap Out-of-Bounds Read During TTF Font Rendering in OpenTypeLayoutEngine::adjustGlyphPositions"

Author

"Google Security Research"

Platform

java

Release date

2019-02-18

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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46410/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46410/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46410/40860/oracle-java-runtime-environment-heap-out-of-bounds-read-during-ttf-font-rendering-in-opentypelayoutengineadjustglyphpositions/download/", "exploit_id": "46410", "exploit_description": "\"Oracle Java Runtime Environment - Heap Out-of-Bounds Read During TTF Font Rendering in OpenTypeLayoutEngine::adjustGlyphPositions\"", "exploit_date": "2019-02-18", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "java", "exploit_port": null}
                                            

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A heap-based out-of-bounds read was observed in Oracle Java Runtime Environment version 8u202 (latest at the time of this writing) while fuzz-testing the processing of TrueType fonts. It manifests itself in the form of the following (or similar) crash:

--- cut ---
  $ bin/java -cp . DisplaySfntFont test.ttf
  Iteration (0,0)
  Iteration (0,1)
  Iteration (0,2)
  Iteration (0,3)
  Iteration (0,4)
  #
  # A fatal error has been detected by the Java Runtime Environment:
  #
  #  SIGSEGV (0xb) at pc=0x00007fbaa11694c8, pid=19540, tid=0x00007fbac4f18700
  #
  # JRE version: Java(TM) SE Runtime Environment (8.0_202-b08) (build 1.8.0_202-b08)
  # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.202-b08 mixed mode linux-amd64 compressed oops)
  # Problematic frame:
  # C  [libfontmanager.so+0x284c8]  OpenTypeLayoutEngine::adjustGlyphPositions(unsigned short const*, int, int, char, LEGlyphStorage&, LEErrorCode&)+0x268
  #
  # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
  #
  # An error report file with more information is saved as:
  # jre/8u202/hs_err_pid19540.log
  #
  # If you would like to submit a bug report, please visit:
  #   http://bugreport.java.com/bugreport/crash.jsp
  # The crash happened outside the Java Virtual Machine in native code.
  # See problematic frame for where to report the bug.
  #
  Aborted
--- cut ---

Under gdb, we can find out that the OpenTypeLayoutEngine::adjustGlyphPositions function attempts to access an invalid memory region:

--- cut ---
  gdb-peda$ c
  Continuing.
  Iteration (0,0)
  Iteration (0,1)
  Iteration (0,2)
  Iteration (0,3)
  Iteration (0,4)

  Thread 2 "java" received signal SIGSEGV, Segmentation fault.
  [----------------------------------registers-----------------------------------]
  RAX: 0x7ffff0283cc0 --> 0x0
  [...]
  [-------------------------------------code-------------------------------------]
     0x7fffc41cb4bb <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+603>:  nop    DWORD PTR [rax+rax*1+0x0]
     0x7fffc41cb4c0 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+608>:  lea    rax,[rax+rax*4]
     0x7fffc41cb4c4 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+612>:  lea    rax,[rdx+rax*4]
  => 0x7fffc41cb4c8 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+616>:  addss  xmm0,DWORD PTR [rax]
     0x7fffc41cb4cc <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+620>:  addss  xmm1,DWORD PTR [rax+0x4]
     0x7fffc41cb4d1 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+625>:  movsxd rax,DWORD PTR [rax+0x10]
     0x7fffc41cb4d5 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+629>:  test   eax,eax
     0x7fffc41cb4d7 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+631>:
      jns    0x7fffc41cb4c0 <_ZN20OpenTypeLayoutEngine20adjustGlyphPositionsEPKtiicR14LEGlyphStorageR11LEErrorCode+608>
  [------------------------------------stack-------------------------------------]
  [...]
  [------------------------------------------------------------------------------]
  Legend: code, data, rodata, value
  Stopped reason: SIGSEGV
  0x00007fffc41cb4c8 in OpenTypeLayoutEngine::adjustGlyphPositions(unsigned short const*, int, int, char, LEGlyphStorage&, LEErrorCode&) ()
     from jre/8u202/lib/amd64/libfontmanager.so
--- cut ---

The crash reproduces on both Windows and Linux platforms. On Windows, the crash manifests in the following way:

--- cut ---
  (3798.db8): Access violation - code c0000005 (first chance)
  First chance exceptions are reported before any exception handling.
  This exception may be expected and handled.
  fontmanager!Java_sun_java2d_loops_DrawGlyphListLCD_DrawGlyphListLCD+0x13346:
  00007ffa`0c9eb046 8b448a10        mov     eax,dword ptr [rdx+rcx*4+10h] ds:00000000`69815274=????????
  0:004> ? rdx
  Evaluate expression: 1696397556 = 00000000`651cf8f4
  0:004> ? rcx
  Evaluate expression: 18421340 = 00000000`0119165c
  0:004> k
   # Child-SP          RetAddr           Call Site
  00 00000000`055ce250 00007ffa`0c9e3c3f fontmanager!Java_sun_java2d_loops_DrawGlyphListLCD_DrawGlyphListLCD+0x13346
  01 00000000`055ce3c0 00007ffa`0c9ef6fe fontmanager!Java_sun_java2d_loops_DrawGlyphListLCD_DrawGlyphListLCD+0xbf3f
  02 00000000`055ce420 00000000`056e8d27 fontmanager!Java_sun_font_SunLayoutEngine_nativeLayout+0x21e
  03 00000000`055ce750 00000000`055ce750 0x56e8d27
  04 00000000`055ce758 00000000`5cb9a4a8 0x55ce750
  05 00000000`055ce760 00000000`055ce7c0 0x5cb9a4a8
  06 00000000`055ce768 00000000`5cb3fd68 0x55ce7c0
  07 00000000`055ce770 00000000`055ce8e8 0x5cb3fd68
  08 00000000`055ce778 00000000`00000000 0x55ce8e8
--- cut ---

Attached with this report are three mutated testcases, and a simple Java program used to reproduce the vulnerability by loading TrueType fonts specified through a command-line parameter.


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/46410.zip