Bug 243588

Summary:	Parser bug can introduce mXSS and HTML sanitizers bypass
Product:	WebKit	Reporter:	Ahmad Saleem <ahmad.saleem792>
Component:	DOM	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED CONFIGURATION CHANGED
Severity:	Normal	CC:	ap, bfulgham, cdumez, rniwa, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 15
Hardware:	Mac (Apple Silicon)
OS:	macOS 12

Description Ahmad Saleem 2022-08-05 08:04:11 PDT

Hi Team,

I was dumpster diving again in Mozilla Bugzilla to identify any test cases in DOM Parser where Safari / Webkit might be different and then testing them across all browser to ensure that Webkit can get to be more web-compatible and came across following test case:

Test Case Link - https://jsbin.com/yomabutoze/edit?html,output

Mozilla Bug - https://bugzilla.mozilla.org/show_bug.cgi?id=1598466

Chrome Bug - https://bugs.chromium.org/p/chromium/issues/detail?id=1005713

Some Blog Post - https://research.securitum.com/dompurify-bypass-using-mxss/

Web-Spec Chrome Discussion - https://bugs.chromium.org/p/chromium/issues/detail?id=1005713#c10

Commit - https://chromium.googlesource.com/chromium/src.git/+/d16226271d4d501de19f019aba1c145930b45503

*** STEPS TO REPRODUCE ***

1) Open Test Case Link
2) Notice Behavior

<< ACTUAL RESULT >>

Safari get dialog with '1' value

<< EXPECTED RESULT >>

No Dialog box similar to other browsers.

___

Appreciate if this can be fixed so there is no dialog box similar to other browsers.

Thanks

Comment 1 Radar WebKit Bug Importer 2022-08-05 14:28:33 PDT

<rdar://problem/98212299>

Comment 2 Ryosuke Niwa 2022-08-06 00:05:32 PDT

Chris recently fixed this.