Frank Küster [2005-12-08 13:17 +0100]:
> Martin Pitt <email address hidden> wrote:
>
> > Hi!
> >
> > I'm currently preparing Ubuntu security updates for these issues, and
> > I noticed that the upstream provided patch is wrong. I sent the mail
> > below to upstream (and some others).
> >
> > Can you please check that you indeed fixed (tetex-bin)/will fix
> > (poppler) DCTStream::readProgressiveSOF(), too?
> [...]
> > It seems that the patch linked from these advisories [1] is a little
> > bit flawed: it checks numComps twice in DCTStream::readBaselineSOF(),
> > but does not check it in DCTStream::readProgressiveSOF().
>
> We have the same flaw in our upload. Would you be so kind and check the
> updated patch at
>
> http://svn.debian.org/wsvn/pkg-tetex/tetex-bin/trunk/debian/patches/patch-CVE-2005-3191+2+3?op=file&rev=0&sc=0
>
> I'm completely illerate in C++, and would like to make sure this is
> correct.
Bad news. A further review of Streams.cc revealed a third place where
numComps goes unchecked (I checked the whole file now, it's really the
last one). So you additionally need this hunk:
Hi Frank!
Frank Küster [2005-12-08 13:17 +0100]: :readProgressiv eSOF(), too? :readBaselineSO F(), :readProgressiv eSOF(). svn.debian. org/wsvn/ pkg-tetex/ tetex-bin/ trunk/debian/ patches/ patch-CVE- 2005-3191+ 2+3?op= file&rev= 0&sc=0
> Martin Pitt <email address hidden> wrote:
>
> > Hi!
> >
> > I'm currently preparing Ubuntu security updates for these issues, and
> > I noticed that the upstream provided patch is wrong. I sent the mail
> > below to upstream (and some others).
> >
> > Can you please check that you indeed fixed (tetex-bin)/will fix
> > (poppler) DCTStream:
> [...]
> > It seems that the patch linked from these advisories [1] is a little
> > bit flawed: it checks numComps twice in DCTStream:
> > but does not check it in DCTStream:
>
> We have the same flaw in our upload. Would you be so kind and check the
> updated patch at
>
> http://
>
> I'm completely illerate in C++, and would like to make sure this is
> correct.
Bad news. A further review of Streams.cc revealed a third place where
numComps goes unchecked (I checked the whole file now, it's really the
last one). So you additionally need this hunk:
@@ -2947,6 +2974,10 @@ GBool DCTStream: :readScanInfo( ) {
length = read16() - 2; numComps = str->getChar(); getPos( ), "Bad DCT scan info block");
scanInfo.
+ if (scanInfo.numComps <= 0 || scanInfo.numComps > 4) {
+ error(getPos(), "Bad number of components in DCT stream");
+ return gFalse;
+ }
--length;
if (length != 2 * scanInfo.numComps + 3) {
error(
Martin www.piware. de www.ubuntu. com www.debian. org
--
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