[Bug 800598] CVE-2012-1139 freetype: data buffer underflow in BDF parser _bdf_parse_glyphs() (#35656)

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Mon Mar 19 14:24:24 UTC 2012


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https://bugzilla.redhat.com/show_bug.cgi?id=800598

Tomas Hoger <thoger at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|CVE-2012-1139 freetype:     |CVE-2012-1139 freetype:
                   |Array index error, leading  |data buffer underflow in
                   |to out-of stack based       |BDF parser
                   |buffer read by parsing BDF  |_bdf_parse_glyphs()
                   |font glyph information      |(#35656)
                   |(FU#35656)                  |
  Status Whiteboard|impact=low,public=20120228, |impact=low,public=20120228,
                   |reported=20120302,source=go |reported=20120302,source=se
                   |ogle,cvss2=4.3/AV:N/AC:M/Au |calert,cvss2=2.6/AV:N/AC:H/
                   |:N/C:N/I:N/A:P,rhel-5/freet |Au:N/C:N/I:N/A:P,rhel-5/fre
                   |ype=new,rhel-6/freetype=new |etype=affected,rhel-6/freet
                   |,fedora-all/freetype=new    |ype=affected,fedora-all/fre
                   |                            |etype=affected,fedora-all/m
                   |                            |ingw32-freetype=affected

--- Comment #2 from Tomas Hoger <thoger at redhat.com> 2012-03-19 10:24:20 EDT ---
(In reply to comment #0)
> An array index error, leading to out-of stack-based buffer read flaw

Actually, it's not stack-based buffer, but a data segment one.  Signed char
variable is used to index the array, so it may lead to underflow / invalid
array access up to 128 bytes before the beginning of the array.  This is not
very likely to trigger any crash, the problem is not reproducible with standard
builds not using AddressSanitizer as was used by the reporter of the upstream
bug.

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