The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-06:01.texindex.asc

Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-06:01.texindex.asc

TeX is a document typesetting system which is popular in the mathematics, physics, and computer science realms because of its ability to typeset complex mathematical formulas. texindex(1) is a utility which is often used to generate a sorted index of a TeX file. The sort_offline function used by texindex(1) employs the maketempname function, which produces predictable file names and fails to validate that the paths do not exist.