As the first of a set of three this paper explains in detail how to abuse some functionalities exposed by mod_negotiation, an Apache module enable by default on many (most?) vanilla setups. Reference platform is a fresh installed Debian Etch system. The "Accept:" HTTP request header allows to optimize the number of requests to discover (bruteforce) filenames and extensions in absence of directory listing. Details follow, a good reading for an hot summer!
Together with Antonio "s4tan" Parata we are glad to release a forced disclosure advisory "Mantis Bug Tracker 1.1.1 Multiple Vulnerabilities" cause CVE were emerging about the same issues disclosed to the vendor. The advisory includes an XSS for return_dynamic_filters.php, a CSRF for manage_user_create.php that allow the creation of administrative accounts and code execution in adm_config_set.php.
We found multiple XSS issues in the sample code of the PHP Network client for WiKID, a Strong Authentication System. In detail identified reflected XSS were on the "login" page forms. Pretty standard issue from a technical standpoint: $PHP_SELF was not properly escaped and sanitized before being echoed back to the client, definitely a known scenario that still affect many different software.
Together with my friend Antonio "s4tan" Parata we released this advisory affecting Cacti 0.8.7a. Found issues include XSS, SQL Injection, Path Disclosure and HTTP Response Splitting. Some bugs are logical flaws related to the use of $_REQUEST, in detail filters were applied to $_GET or $_POST but later $_REQUEST was used. Since $_REQUEST is build in an order defined in php.ini (normally GPC) it was possible to bypass the check and inject the malicious payload in POST or COOKIE for GET and COOKIE for POST.
As you probably noticed ush.it was pretty quiet in the last 5/6 months, this happened because there were cyclic dependencies in my todo list. Well now the situation is unblocked again and you can, perhaps, expect new posts! Just to reply to the "no more updates/why don't you post more/etc" sentences category i would remind that here we publish our research and naive contents and most likely we are not going to comment/bounce/mirror everything happening in this amazing world. A direct consequence is that ush.it will never have daily, regular or forced updates.
Few moments ago i was reading the Skype 1.4.118 for Linux changelog and noticed a new feature named "Auto-accept file transfers". Damn i thought, if it's by default an issue found accidentally some time ago is now fully weaponized: Skype 1.4.0.74 (probably also others) happily overwrites files without asking!
I was looking for a NoScript detector, something that could tell me if the user has JS disabled in the Firefox preferences or by the NoScript plugin written by Maone, and found nothing. To repair this i wrote this trivial POC that is able to accomplish the task, it performs fingerprinting based on the behavior of the browser under the different possible conditions and is really reliable from the measurements done until now.
Today on the ml one of our pupils, remix, posted about GreenSQL, "an Open Source database firewall used to protect databases from SQL injection attacks". In other words something that stands to SQL as mod_security stands to HTTP.
We found a severe vulnerability in the Original script, a photo gallery software. Remote command (directly into an exec()) execution is possible with register globals on regardless the PHP version.
Today Stefano had a nice idea on how to (ab)use remote furl enabled functions that normally could lead to a mere DoS. Options are Drive By Pharming, Bruteforcing routers and http based authentications and Full Lan Scan. Sounds interesting? It is.
Sometimes it's right to enjoy a more relaxed entry.
A lot of people contacted me about my post on FD. No, I have no clue of what's really going and I can happily live believing the official reports (http://heartbeat.skype.com/) on the issue. This is the complete message I posted to FD in reply to Valery Marchuk (http://lists.grok.org.uk/pipermail/full-disclosure/2007-August/065343.html):