1/8/2024 0 Comments Mattermost markup![]() I used the DOM inspector to look at the seemingly blank TXT record, and found out it was, indeed, the script tag that was triggering the Harlem Shake takeover. What's worse, it was a functional YouTube video embed! One of the DNS TXT records was a YouTube video embed. One showed up as blank in the page, so I skipped over it. Two of them appear to be (intentionally) malicious. The domain being looked at returns several TXT records. I couldn't track down exactly how the Harlem script was being injected. It took a few minutes of digging to figure out what was actually going on with the site. It's awesome, both in terms of humor, and in terms of the stellar example this presents of how not to build a site. Shortly after the page loads, you hear a Harlem Shake track play in the background and, shortly thereafter, see all of the content on the page dance along with the music. Unfortunately you can't see the active exploit any longer. Own linked here to a DNS lookup tool that, apparently, is suffering from a cross-site scripting exploit.The site was being actively mocked at the time of this writing, but late yesterday afternoon I noticed that the site host updated their system to properly escape DNS record output. Or it can make your entire page to the Harlem Shake. capture usernames and passwords, sending them to a remote site). It can intercept visitor interactions (i.e. Once the script is there, it can manipulate your page in any way it wants. The point of an XSS vulnerability is that an attacker can inject a script into your page. Invoking the validator on all untrusted markup and failing early if it returns an error can prevent these types of issue from being exploited in an otherwise affected application.One of the first things on any security auditor's list is checking to see if a site is vulnerable to cross-site scripting (XSS). The /mattermost/xml-roundtrip-validator module can detect unstable constructs in an XML document, including unstable attribute namespace prefixes. ![]() This can lead to full authentication bypass and arbitrary privilege escalation within the scope of a SAML Service Provider. Attempting to validate the structure of an XML document can succeed or fail depending on the number of encoding round-trips it has gone through.Īs a specific example, an affected SAML implementation can interpret a SAML Assertion as signed, but then proceed to read values from an unsigned part of the same document due to namespace mutations between signature verification and data access. Equivalent lookups within an XML document can return different results during different stages of the document's lifecycle. Mutations caused by encoding round-trips can lead to incorrect or conflicting decisions in affected applications. Prominent examples of such applications include SAML and XML-DSig implementations. Encoding and decoding using Go's encoding/xml can change the observed namespace as well as the observed local name of a maliciously crafted XML attribute.Īffected applications include software that relies on XML integrity for security-sensitive decisions. Go's encoding/xml handles namespace prefixes on XML attributes in a way that causes crafted markup to mutate during round-trips through the xml.Decoder and xml.Encoder implementations. Security Advisory: XML attribute instability in Go's encoding/xml Affected componentĩ.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
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