As demonstrated at the test URL and announced on Chris Evans' blog the XPath generate-id() function returns a valid heap address which might provide a useful handle in other attacks. Appears to affect all browsers one way or another (Chrome was patched before announcing this). http://scarybeastsecurity.blogspot.com/2011/03/multi-browser-heap-address-leak-in-xslt.html
Created attachment 518223 [details] [diff] [review] patch to fix Needs a bit more testing, but I think this should do it. I originally used the address of the txExecutionState itself, but since that usually lives on the stack it's possible that that'll be on a predictable address.
Comment on attachment 518223 [details] [diff] [review] patch to fix >diff --git a/content/xslt/src/xpath/txMozillaXPathTreeWalker.cpp b/content/xslt/src/xpath/txMozillaXPathTreeWalker.cpp >+ PRUword nodeid = ((PRUword)aNode.mNode) - ((PRUword)aBase.mNode); Don't think you need all those brackets. >diff --git a/content/xslt/src/xslt/txGenerateIdFunctionCall.cpp b/content/xslt/src/xslt/txGenerateIdFunctionCall.cpp >+ "called xslt extension function \"current\" with wrong context"); s/current/generate-id/ I don't think this can leak info about adresses anymore.
6 years ago
Dan, I don't know how you want to do about landing this on branches given that I don't think it can land on trunk right now.
Comment on attachment 518223 [details] [diff] [review] patch to fix Approved for 18.104.22.168 and 22.214.171.124, a=dveditz for release-drivers
S'ok, we'll take the branches now and 4.0.1 when we can.
Checked in to branches: http://hg.mozilla.org/releases/mozilla-1.9.1/rev/768b54fa2f7d http://hg.mozilla.org/releases/mozilla-1.9.2/rev/a201c429788b Leaving open as it hasn't been check in to trunk yet. Also nominating for the 2.0 branch as that'll likely be a separate landing.
Comment on attachment 518223 [details] [diff] [review] patch to fix Approved for the mozilla2.0 repository, a=dveditz for release-drivers
Checked in on m-c and 2.0: http://hg.mozilla.org/mozilla-central/rev/c2bd5cf4070e http://hg.mozilla.org/releases/mozilla-2.0/rev/e01dc3fc20d3
6 years ago
Tarak, what is this attachment supposed to be? It looks like an executable.
Comment on attachment 529326 [details] [diff] [review] patch security Marking obsolete for now as I suspect this was added by mistake.