The protocolIs function in platform/KURLGoogle.cpp in WebCore in WebKit before r55822, as used in Google Chrome before 4.1.249.1036 and Flock Browser 3.x before 3.0.0.4112, does not properly handle whitespace at the beginning of a URL, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted javascript: URL, as demonstrated by a \x00javascript:alert sequence.
code.google.com/p/chromium/issues/detail?id=37383
codereview.chromium.org/858001
flock.com/security/
googlechromereleases.blogspot.com/2010/03/stable-channel-update.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
secunia.com/advisories/43068
src.chromium.org/viewvc/chrome?view=rev&revision=41244
www.vupen.com/english/advisories/2011/0212
bugs.webkit.org/show_bug.cgi?id=35948
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14067