h00die
102 lines
3.9 KiB
Markdown
102 lines
3.9 KiB
Markdown
## Vulnerable Application
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This module exploits a vulnerability in `WebKitFaviconDatabase` when `pageURL` is unset.
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If successful, it could lead to application crash, resulting in denial of service.
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The `webkitFaviconDatabaseSetIconForPageURL` and `webkitFaviconDatabaseSetIconURLForPageURL`
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functions in `UIProcess/API/glib/WebKitFaviconDatabase.cpp` in WebKit, as used in WebKitGTK+
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through 2.21.3, mishandle an unset `pageURL`, leading to an application crash.
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Related links :
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* https://bugs.webkit.org/show_bug.cgi?id=186164
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* https://datarift.blogspot.com/2018/06/cve-2018-11646-webkit.html
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## Backtrace using Fedora 27
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```
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#0 WTF::StringImpl::rawHash
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 508
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#1 WTF::StringImpl::hasHash
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 514
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#2 WTF::StringImpl::hash
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringImpl.h line 525
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#3 WTF::StringHash::hash
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/text/StringHash.h line 73
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#9 WTF::HashMap, WTF::HashTraits >::get
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/HashMap.h line 406
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#10 webkitFaviconDatabaseSetIconURLForPageURL
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFaviconDatabase.cpp line 193
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#11 webkitFaviconDatabaseSetIconForPageURL
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFaviconDatabase.cpp line 318
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#12 webkitWebViewSetIcon
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp line 1964
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#13 WTF::Function::performCallbackWithReturnValue
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/GenericCallback.h line 108
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#15 WebKit::WebPageProxy::dataCallback
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/WebPageProxy.cpp line 5083
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#16 WebKit::WebPageProxy::finishedLoadingIcon
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WebKit/UIProcess/WebPageProxy.cpp line 6848
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#17 IPC::callMemberFunctionImpl::operator()
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/glib/RunLoopGLib.cpp line 68
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#29 WTF::RunLoop::::_FUN(gpointer)
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at /usr/src/debug/webkitgtk4-2.18.0-2.fc27.x86_64/Source/WTF/wtf/glib/RunLoopGLib.cpp line 70
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#30 g_main_dispatch
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at gmain.c line 3148
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#31 g_main_context_dispatch
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at gmain.c line 3813
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#32 g_main_context_iterate
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at gmain.c line 3886
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#33 g_main_context_iteration
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at gmain.c line 3947
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#34 g_application_run
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at gapplication.c line 2401
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#35 main
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at ../src/ephy-main.c line 432
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```
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## Verification Steps
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Start msfconsole
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use auxiliary/dos/http/webkitplus
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Set SRVHOST
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Set SRVPORT
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Set URIPATH
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run (Server started)
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Visit server URL in epiphany web browser which uses webkit.
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## Scenarios
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```
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msf auxiliary(dos/http/webkitplus) > show options
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Module options (auxiliary/dos/http/webkitplus):
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Name Current Setting Required Description
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---- --------------- -------- -----------
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SRVHOST 192.168.1.105 yes The local host to listen on. This must be an address on the local machine or 0.0.0.0
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SRVPORT 8080 yes The local port to listen on.
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SSL false no Negotiate SSL for incoming connections
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SSLCert no Path to a custom SSL certificate (default is randomly generated)
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URIPATH / no The URI to use for this exploit (default is random)
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Auxiliary action:
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Name Description
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---- -----------
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WebServer
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msf auxiliary(dos/http/webkitplus) > run
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[*] Auxiliary module running as background job 0.
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msf auxiliary(dos/http/webkitplus) >
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[*] Using URL: http://192.168.1.105:8080/
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[*] Server started.
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msf auxiliary(dos/http/webkitplus) >
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[*] Sending response
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msf auxiliary(dos/http/webkitplus) >
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```
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