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Auto merge of #12679 - johannhof:image-inject, r=Manishearth

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Prevent injection vulnerability in image page

This is taking up nox' suggestion from #12542 and creates an img element using Rust code instead of escaping the URL. I will look at the neterror.html URL strings separately, we might do those in a similar way.

To reproduce, visit e.g. the following URL with your vulnerable Servo:
```
https://servo.org/screenshot.png?'onload='document.body.innerHTML=`hacked`'
```

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #12542

- [x] These changes do not require tests because this is just fixing up existing behavior and I'm not sure how to test it

r?@jdm

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This commit is contained in:
bors-servo 2016-08-01 13:27:46 -05:00 • committed by GitHub
commit 144b980df2
1 changed files with 14 additions and 2 deletions
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16
components/script/dom/servohtmlparser.rs
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@ -7,13 +7,18 @@
use document_loader::LoadType;
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
use dom::bindings::codegen::Bindings::HTMLImageElementBinding::HTMLImageElementMethods;
use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use dom::bindings::codegen::Bindings::ServoHTMLParserBinding;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{JS, Root};
use dom::bindings::refcounted::Trusted;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::bindings::str::DOMString;
use dom::bindings::trace::JSTraceable;
use dom::document::Document;
use dom::htmlimageelement::HTMLImageElement;
use dom::node::Node;
use dom::window::Window;
use encoding::all::UTF_8;
@ -112,13 +117,20 @@ impl AsyncResponseListener for ParserContext {
match content_type {
Some(ContentType(Mime(TopLevel::Image, _, _))) => {
self.is_synthesized_document = true;
let page = format!("<html><body><img src='{}' /></body></html>", self.url);
let page = "<html><body></body></html>".into();
parser.pending_input().borrow_mut().push(page);
parser.parse_sync();
let doc = parser.document();
let doc_body = Root::upcast::<Node>(doc.GetBody().unwrap());
let img = HTMLImageElement::new(atom!("img"), None, doc);
img.SetSrc(DOMString::from(self.url.to_string()));
doc_body.AppendChild(&Root::upcast::<Node>(img)).expect("Appending failed");
},
Some(ContentType(Mime(TopLevel::Text, SubLevel::Plain, _))) => {
// https://html.spec.whatwg.org/multipage/#read-text
let page = format!("<pre>\n");
let page = "<pre>\n".into();
parser.pending_input().borrow_mut().push(page);
parser.parse_sync();
parser.set_plaintext_state();