Simon Willison’s Weblog

DoS vulnerability in REXML. Ruby’s REXML library is susceptible to the “billion laughs” denial of service attack where recursively nested entities expand a single entitity reference to a billion characters (kind of like the exploding zip file attack). Rails applications that process user-supplied XML should apply the monkey-patch ASAP; a proper gem update is forthcoming. 11:11 am

Tip: Configure SAX parsers for secure processing. Explains the billion laughs attack, among others. 11:12 am

Film + Food & drink | guardian.co.uk (via) The Guardian’s publishing system supports tag intersections based on the URL; this page shows all film stories that also mention food. There’s even an RSS feed. 11:18 am

The Python Property Builtin. The always-educational Adam Gomaa explains the Python property built-in and shows how it can be used to improve Django’s model-based URL generation. 1:08 pm