Bug 1000109 (CVE-2013-0340)

As reported on oss-security [1]:

So here are the CVE's for the two big ones, libxml2 and expat. Both
are affected by the expansion of internal entities (which can be used
to consume resources) and external entities (which can cause a denial
of service against other services, be used to port scan, etc.).

To be clear:

====================
Internal entity expansion refers to the exponential/quadratic/fast
linear expansion of XML entities, e.g.:
====================
<!DOCTYPE xmlbomb [
<!ENTITY a "1234567890" >
<!ENTITY b "&a;&a;&a;&a;&a;&a;&a;&a;">
<!ENTITY c "&b;&b;&b;&b;&b;&b;&b;&b;">
<!ENTITY d "&c;&c;&c;&c;&c;&c;&c;&c;">
]>
<bomb>&d;</bomb>

or

<!DOCTYPE bomb [
<!ENTITY a "xxxxxxx... a couple of ten thousand chars">
]>
<bomb>&a;&a;&a;... repeat</bomb>

Which causes resources to be consumed

...
Please use CVE-2013-0340 for expat internal entity expansion


[1] http://www.openwall.com/lists/oss-security/2013/02/22/4