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Code Issues Releases Activity

Desktop: Security: Fixed possible XSS injection

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This commit is contained in:
Laurent Cozic 2023-05-10 16:27:16 +01:00
parent 865cedc24f
commit b26bc9ed5f
3 changed files with 13 additions and 4 deletions
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1
packages/app-cli/tests/md_to_html/sanitize_13.html Normal file
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@ -0,0 +1 @@
<div class="jop-noMdConv"><svg class="jop-noMdConv"><style class="jop-noMdConv">&lt;/svg>&lt;iframe srcdoc="&lt;script>top.require('child_process').execSync('calc')&lt;/script>">&lt;/iframe>&lt;/div>

1
packages/app-cli/tests/md_to_html/sanitize_13.md Normal file
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@ -0,0 +1 @@
<div><svg><style></svg><iframe srcdoc="<script>top.require('child_process').execSync('calc')</script>"></iframe></div>

15
packages/renderer/htmlUtils.ts
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@ -235,11 +235,18 @@ class HtmlUtils {
ontext: (decodedText: string) => {
if (disallowedTagDepth) return;
if (currentTag() === 'style') {
// For CSS, we have to put the style as-is inside the tag because if we html-entities encode
// it, it's not going to work. But it's ok because JavaScript won't run within the style tag.
// Ideally CSS should be loaded from an external file.
output.push(decodedText);
// For CSS, we have to put the style as-is inside the tag
// because if we html-entities encode it, it's not going to
// work. But it's ok because JavaScript won't run within the
// style tag. Ideally CSS should be loaded from an external
// file.
// We however have to encode at least the `<` characters to
// prevent certain XSS injections that would rely on the
// content not being encoded (see sanitize_13.md)
output.push(decodedText.replace(/</g, '&lt;'));
} else {
output.push(htmlentities(decodedText));
}