Jon Erickson of iSIGHT Partners Labs discovered a heap overflow in xml-security-c, an implementation of the XML Digital Security specification. The fix to address CVE-2013-2154 introduced the possibility of a heap overflow in the processing of malformed XPointer expressions in the XML Signature Reference processing code, possibly leading to arbitrary code execution.
For the oldstable distribution (squeeze), this problem has been fixed in version 1.5.1-3+squeeze3.
For the stable distribution (wheezy), this problem has been fixed in version 1.6.1-5+deb7u2.
For the unstable distribution (sid), this problem has been fixed in version 1.6.1-7.
We recommend that you upgrade your xml-security-c packages.