Apple QuickTime RTSP Content-Type header stack buffer overflow


### Overview Apple QuickTime contains a stack buffer overflow vulnerability that may allow a remote, unauthenticated attacker to execute arbitrary code or cause a denial-of-service condition. ### Description Real Time Streaming Protocol ([RTSP](<http://tools.ietf.org/html/rfc2326>)) is a protocol that is used by streaming media systems. The Apple QuickTime Streaming Server and QuickTime player both support RTSP. Apple QuickTime contains a stack buffer overflow vulnerability in the way QuickTime handles the RTSP [Content-Type](<http://tools.ietf.org/html/rfc2326#section-12.16>) header. This vulnerability may be exploited by convincing a user to connect to a specially crafted RTSP stream. Note that QuickTime is a component of Apple iTunes, therefore iTunes installations are also affected by this vulnerability. We are aware of publicly available exploit code for this vulnerability. Testing indicates that QuickTime versions 4.0 through 7.3 are vulnerable on all supported Mac and Windows platforms. --- ### Impact By convincing a user to connect to a specially crafted RTSP stream, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. An attacker can use various types of web page content, including a QuickTime Media Link file, to cause a user to load an RTSP stream. --- ### Solution Apple has released QuickTime [7.3.1](<http://docs.info.apple.com/article.html?artnum=307176>) to address this issue. Until updates can be applied, please consider the following workarounds. Note that these workarounds block certain attack vectors, but do not remove the vulnerability. --- **Uninstall QuickTime** Until updates are available, uninstalling QuickTime will mitigate this vulnerability. Note that uninstalling QuickTime will make applications that rely on QuickTime (such as iTunes) fail to run or run with limited functionality. **Block the **`**rtsp://**`** protocol** Blocking the RTSP protocol with proxy or firewall rules may help mitigate this vulnerability. Blocking outbound access to `554/tcp` and `6970-6999/udp` may partially mitigate this vulnerability. Since RTSP may use a variety of port numbers, blocking the protocol based on a particular port may not be sufficient. **Secure your web browser** Follow the guidelines described in the [Securing Your Web Browser](<http://www.us-cert.gov/reading_room/securing_browser/>) document. These guidelines include several mitigations against this vulnerability, such as disabling downloads from untrusted sites in Internet Explorer on Microsoft Windows systems and disabling the option to _Open "safe" files after downloading_ in Safari on Apple Mac systems. **Disable the QuickTime ActiveX controls in Internet Explorer** The QuickTime ActiveX controls can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs: `{02BF25D5-8C17-4B23-BC80-D3488ABDDC6B}` `{4063BE15-3B08-470D-A0D5-B37161CFFD69}` More information about how to set the kill bit is available in [Microsoft Support Document 240797](<http://support.microsoft.com/kb/240797>). Alternatively, the following text can be saved as a `.REG` file and imported to set the kill bit for these controls: `Windows Registry Editor Version 5.00` `[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{02BF25D5-8C17-4B23-BC80-D3488ABDDC6B}]` `"Compatibility Flags"=dword:00000400` `[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{4063BE15-3B08-470D-A0D5-B37161CFFD69}]` `"Compatibility Flags"=dword:00000400` **Disable the QuickTime plug-in for Mozilla-based browsers** Users of Mozilla-based browsers, such as Firefox can disable the QuickTime plugin, as specified in the PluginDoc article [Uninstalling Plugins](<http://plugindoc.mozdev.org/faqs/uninstall.html>). **Disable the RTSP protocol handler** Mac OS X users can disable the RTSP protocol handler by editing the `~/Library/Preferences/com.apple.LaunchServices.plist` file with Property List Editor. Change the `LSHandlerRoleAll` value associated with the `rtsp` `LSHanlderURLScheme` to something other than `com.apple.quicktimeplayer`. This process can be simplified by using an application such as [RCDefaultApp](<http://www.rubicode.com/Software/RCDefaultApp/>). Microsoft Windows users should not need to make any changes, as QuickTime does not appear to register itself as the handler for the RTSP protocol on Windows systems. **Disable file association for QuickTime files** Disable the file association for QuickTime file types to help prevent windows applications from using Apple QuickTime to open QuickTime files. This can be accomplished by deleting the following registry keys: `HKEY_CLASSES_ROOT\QuickTime.*` This will remove the association for approximately 32 file types that are configured to open with the QuickTime Player software. **Disable QuickTime as the RTSP protocol handler on OS X** To disable the RTSP registered protocol handler in OS X open ~/Library/Preferences/com.apple.LaunchServices.plist and look through a hundred or more entries to find RTSP and change it to something else. **Disable JavaScript** For instructions on how to disable JavaScript, please refer to the [Securing Your Web Browser](<http://www.us-cert.gov/reading_room/securing_browser/>) document. This can help prevent some attack techniques that use the QuickTime plug-in or ActiveX control. **Do not access QuickTime files from untrusted sources** Attackers may host malicious QuickTime files on web sites. In order to convince users to visit their sites, those attackers often use a variety of techniques to create misleading links including URL encoding, IP address variations, long URLs, and intentional misspellings. Do not click on unsolicited links received in email, instant messages, web forums, or internet relay chat (IRC) channels. Type URLs directly into the browser to avoid these misleading links. While these are generally good security practices, following these behaviors will not prevent exploitation of this vulnerability in all cases, particularly if a trusted site has been compromised or allows cross-site scripting. --- ### Vendor Information 659761 Filter by status: All Affected Not Affected Unknown Filter by content: __ Additional information available __ Sort by: Status Alphabetical Expand all **Javascript is disabled. Click here to view vendors.** ### Apple Computer, Inc. Affected Notified: November 23, 2007 Updated: November 24, 2007 ### Status Affected ### Vendor Statement We have not received a statement from the vendor. ### Vendor Information The vendor has not provided us with any further information regarding this vulnerability. ### CVSS Metrics Group | Score | Vector ---|---|--- Base | | Temporal | | Environmental | | ### References * <http://docs.info.apple.com/article.html?artnum=307176> * <http://www.beskerming.com/security/2007/11/25/74/QuickTime_-_Remote_hacker_automatic_control> * <http://tools.ietf.org/html/rfc2326> * <http://tools.ietf.org/html/rfc2326#section-12.16> * <http://www.apple.com/quicktime/technologies/streaming/> * <http://www.gnucitizen.org/blog/backdooring-mp3-files/> * <http://developer.apple.com/quicktime/icefloe/dispatch028.html> * <http://www.apple.com/quicktime/resources/qt/us/proxy/> * <http://www.milw0rm.com/exploits/4648> * <http://www.milw0rm.com/exploits/4651> * <http://www.milw0rm.com/exploits/4657> * <http://quicktime.tc.columbia.edu/users/iml/movies/mtest.html> * <http://www.symantec.com/enterprise/security_response/weblog/2007/12/exploit_for_apple_quicktime_vu.html> * <http://www.rubicode.com/Software/RCDefaultApp/> ### Acknowledgements This vulnerability was publicly disclosed by Krystian Kloskowski. This document was written by Ryan Giobbi and Will Dormann. ### Other Information **CVE IDs:** | [CVE-2007-6166](<http://web.nvd.nist.gov/vuln/detail/CVE-2007-6166>) ---|--- **Severity Metric:** | 40.32 **Date Public:** | 2007-11-23 **Date First Published:** | 2007-11-24 **Date Last Updated: ** | 2008-01-11 00:39 UTC **Document Revision: ** | 70