On Sat, Dec 12, 2009 at 10:56:59PM -0500, Michael Gilbert wrote: > package: xulrunner > severity: serious > tags: security > > Hi, > > The following CVE (Common Vulnerabilities & Exposures) ids were > published for expat. I have determined that this package embeds a > vulnerable copy of xmlparse.c and xmltok_impl.c. However, since this is > a mass bug filing (due to so many packages embedding expat), I have > not had time to determine whether the vulnerable code is actually > present in any of the binary packages derived from this source package. > Please determine whether this is the case. If the binary packages are > not affected, please feel free to close the bug with a message > containing the details of what you did to check. > > CVE-2009-3560[0]: > | The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, > | as used in the XML-Twig module for Perl, allows context-dependent > | attackers to cause a denial of service (application crash) via an XML > | document with malformed UTF-8 sequences that trigger a buffer > | over-read, related to the doProlog function in lib/xmlparse.c, a > | different vulnerability than CVE-2009-2625 and CVE-2009-3720. >From what I understand from the vulnerability, the an specially crafted big5 encoded document can trigger a bad conversion to utf-8 which in turn can trigger this bug, due to the malformed utf-8.
> CVE-2009-3720[1]: > | The updatePosition function in lib/xmltok_impl.c in libexpat in Expat > | 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, > | allows context-dependent attackers to cause a denial of service > | (application crash) via an XML document with crafted UTF-8 sequences > | that trigger a buffer over-read, a different vulnerability than > | CVE-2009-2625. This one is about a buffer overrun from malformed utf-8 at the end of the buffer. AFAIK, none of these bugs should be affecting the mozilla code base, as it is doing its own utf-8 conversions and sanitizes it well before it comes to expat. Mike -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
