The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Below is a copy: jQuery html() Cross Site Scripting
# jquery-xss-in-html
jQuery < 3.5 Cross-Site Scripting (XSS) in html()
Timmy Willison recently released a new version of jQuery. jQuery 3.5 fixes a cross-site scripting (XSS) vulnerability found in the jQuerys HTML parser. The Snyk open source security platform estimates that 84% of all websites may be impacted by jQuery XSS vulnerabilities.
Masato Kinugawa found a cross-site scripting (XSS) vulnerability in the htmlPrefilter method of jQuery, and published an example showing a popup alert window in the form of a challenge. (https://xss.pwnfunction.com/challenges/ww3/)
Below is a CodeQL query I wrote that can find user controlled values passed to html() which can be abused to perform Cross-Site Scripting.
Please check your projects, submit responsible disclosures to projects that might be affected.
```
/**
* @name Taint-tracking to 'html' calls (with path visualization)
* @description Tracks user-controlled values into 'html' calls (vulnerable to XSS in jQuery < 3.5)
* and generates a visualizable path from the source to the sink.
* @kind path-problem
* @tags security
* @id js/html-taint-path
*/
import javascript
import DataFlow
import DataFlow::PathGraph
import DOM
import semmle.javascript.dependencies.FrameworkLibraries
class HtmlTaint extends TaintTracking::Configuration {
HtmlTaint() { this = "HtmlTaint" }
override predicate isSource(Node node) { node = DOM::locationSource() }
override predicate isSink(Node node) { node =jquery().getACall().getAMethodCall("html").getArgument(0) }
}
from HtmlTaint cfg, PathNode source, PathNode sink, FrameworkLibraryInstance framework, string version
where cfg.hasFlowPath(source, sink) and framework.info("jquery", version)
select sink.getNode(), source, sink, "Html with user-controlled input from $@. When using jquery version $@.", source.getNode(), "here", framework, version
```
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