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.
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!
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):
I'm sure you have already heard of the many external protocol handling vulnerabilities that hitted Firefox lately. Normally on this site you read about "in-security", this article is a little exception since it contains some tips that anybody can adopt to harden his preferred http/https client, also named Mozilla Firefox, thought the about:config interface.
Stefano Di Paola with contribution from Giorgio Fedon (both from a brand new security research company, MindedSecurity) and Elia Florio have just released the details about a Remote Code Execution flaw in Flash Plugin 9 independent from the OS. Parsing a flv with adobe flash player it's possible to trigger an exploitable integer overflow.
When exploiting XSS holes often you find yourself working around size/length and characters limitations. To avoid this type of problems a technique called "two stage payloads" comes to help. It's generally used when exploiting memory management vulnerabilities but applies to the XSS world too. The very basic idea is to have the payload divided in two parts: one that has to be injected in the entry point (PAY_ENTRY) and one that contains the actual data (PAY_DATA).
When performing XSS attacks often happens that the payload is displayed, and executed, multiple times occurring in unwanted and unexpected behaviors. This can be avoided in many ways, for example using global variables in JS (eg: window['started'] = true;) and checking for the variable existence at the very beginning of the payload, but when the filters are crazy and every char requires a notable effort (or when you are just hurry) one cheat gets the job done: the <PLAINTEXT> tag.
Sabato 17 Giugno a Verona presso l'Itis G. Marconi (Piazzale Guardini 1) si terra' Linuxpersec2 (Conosciamo altri modi... per proteggerlo!) con vari interventi sulla Sicurezza personale e Linux. La manifestazione e' gratuita e ovviamente siete tutti invitati :D
Today I was reading Firefox XPI Install Prevention Bypass (http://www.0x000000.com/?i=329) and while it's not what it promised to be (there is no Install Prevention Bypass) it contained useful informations that helped me elaborate two distinct thoughts.
On 30 May Mozilla Foundation announced in its MFSA (Mozilla Foundation Security Advisory) 2007-16 a bug discovered by moz_bug_r_a4 able to bypass the same-origin policy using the addEventListener helper. Needless to say you can do really nasty things by exploiting this hole, ranging from xss attacks to keystrokes logging, with no same origin limitation. If you are impatient jump directly to the demo DOM Event Keylogger.
Anurag Agarwal has published a reflection on our friend Stefano Di Paola. The interview contains a condensed auto-biography (nice reading, thanks Stefano!); integral text follows.
Yesterday I (Francesco `ascii` Ongaro) found a low impact bug: basically it is possible to make the user visit a page that is not listed in the back/next button history. The fun happens when self.location.replace() is pointing to a page that issues an HTTP/1.x 302 Redirect + Location. Both initial and redirect page will not be listed.
Antonio `s4tan` Parata, software security researcher and member of the ush team interviews Rain Forest Puppy, famous bug hunter, specialized in web application assessment. It's a pleasure for us to publish the full interview, in this case talk is not cheap.
No bells and whistles, just the tiny list: Guerrillamail, Tempinbox, Mailinator, Tempomail, Spambox, Dodgeit, Mytrashmail, Spamcero, Jetable, Maileater, Spamfree24, Nobulk, Temporaryinbox, Spam.la, we.despammed.it and Tempemail.
Stefano `wisec` Di Paola has just released a new advisory IE 7 and Firefox Browsers Digest Authentication Request Splitting, basically using the user field an attacker is able to split the request injecting arbitrary chars.
My friend Stefano di Paola and I have discovered that a PHP function used to emulate register_globals on is able to overwrite any variable (also $_SESSION and $_SERVER) with the exception of $GLOBALS. Naturally during the Month of PHP bugs :)
To demonstrate the import_request_variables() bug i've exploited a XSS flaw in PHP NUKE 8.0 that has an anti-CSRF routine. The import_request_variables() vulnerability will permit you to exploit a wide range of vectors (XSS, remote file inclusion, remote code execution, SQL injections, etc.) on software that makes use of it.
This story is mostly funsec, if you can't handle funsec stop reading :) You have just developed you brand new application, it's name is EVIL.EXE. It's a very good application but nobody will install it without good partners.. You need somebody trusted from users that is willing to distribuite it. So.. Let's go! Find out some good partners.
This night i was in the process of mirroring all the tmbo.org daily pics for fast viewing. Their site has to be hosted on an ADSL link (like ush.it, hey this site is on a 200kbs/300kbs link, very unprofessional but no one can raid [stupid wordpress plug-in, this is not RAID in the sense of Redundant Disk Array but raid the verb] our server without our knowledge, think about the autistici/inventati aruba raid for example).
From 23 to 31 December i was in Berlin for the CCC congress with other Italian security researchers and friends. We had good time enjoying Berlin, drinking beer and exchanging informations. Also Stefano Di Paola and Giorgio Fedon disclosed some Adobe Acrobat Reader bugs in a larger talk titled Subverting AJAX.
At CCC my friends Stefano Di Paola and Giorgio Fedon releades some of their latest findings, note that this is a translation in italiano of the original advisory aviable on wisec.it (http://www.wisec.it/vulns.php?page=9) that of course is in english. The advisory is focused on some specific bugs, one of these is called UXSS (Universal Cross Site Scripting) in PDF files.