bugThe FreeType Project - Bugs: bug #31310, ft_var_readpackedpoints() buffer...


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bug #31310: ft_var_readpackedpoints() buffer overflow

Submitted by:  None
Submitted on:  Mon 11 Oct 2010 11:03:45 PM UTC  
Severity:  3 - Normal Item Group:  Crash
Status:  Fixed Privacy:  Public
Assigned to:  Werner LEMBERG <wl> Open/Closed:  Closed
Planned Release:  2.4.4

Tue 12 Oct 2010 05:55:19 AM UTC, comment #1: 

This should be fixed in the git.  Thanks for the report.  Please test.

Unfortunately, I don't have a GX font for testing which calls `ft_var_readpackedpoints' at all.  If you have such a font I would be glad if you could provide it to me privately.

Werner LEMBERG <wl>
Project AdministratorIn charge of this item.
Mon 11 Oct 2010 11:03:45 PM UTC, original submission:  

The function ft_var_readpackedpoints() in src/truetype/ttgxvar.c has a buffer overflow, leading to crashes and potential code execution.

When parsing a malicious TrueType GX font with n set to a lower value than runcnt, the for loops in the function will keep writing outside of allocated memory.

This was tested on version 2.4.3.

-- "van damme's brain cell"



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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-10-12 wl StatusNone => Fixed
        Assigned toNone => wl
        Open/ClosedOpen => Closed
        Planned ReleaseNone => 2.4.4

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