Unicode Flaws

[Shawn]

"According to this CERT advisory: 'Full-width and half-width encoding is a technique for encoding Unicode characters. Various HTTP content scanning systems fail to properly scan full-width/half-width Unicode encoded HTTP traffic. By sending specially-crafted HTTP traffic to a vulnerable content scanning system, an attacker may be able to bypass that content scanning system.' A proof of concept affecting IIS is already being posted to security mailing lists. Cisco IPS and other IDS products are also affected." The CERT advisory lists 93 systems, with 6 reported as vulnerable (including 3com, Cisco, and Snort), 5 known not vulnerable (including Apple and HP), and the rest unknown.