Nicolas Gregoire discovered that the XML Security Library xmlsec allowed remote attackers to create or overwrite arbitrary files through specially crafted XML files using the libxslt output extension and a ds:Transform element during signature verification.
For the oldstable distribution (lenny), this problem has been fixed in version 1.2.9-5+lenny1.
For the stable distribution (squeeze), this problem has been fixed in version 1.2.14-1+squeeze1.
For the testing distribution (wheezy) and unstable distribution (sid), this problem has been fixed in version 1.2.14-1.1.
We recommend that you upgrade your xmlsec1 packages.