It was discovered that ajaxterm, a web-based terminal, generates weak and predictable session IDs, which might be used to hijack a session or cause a denial of service attack on a system that uses ajaxterm. For the oldstable distribution , the problem has been fixed in version 0.9-2+etch1. For the stable distribution , the problem has been fixed in version 0.10-2+lenny1. For the unstable distribution , the problem has been fixed in version 0.10-5. We recommend that you upgrade your ajaxterm package.