Old Apple QuickTime code puts IE users in harm's way
Exploit bypasses Windows' DEP, ASLR defenses, can be used in drive-by attacks
Computerworld - Apple's failure to clean up old code in QuickTime leaves people running Internet Explorer vulnerable to drive-by attacks, a Spanish security researcher said today.
Ruben Santamarta, a researcher at Madrid-based Wintercore who revealed a bug in IE8 last month, today outlined the QuickTime plug-in vulnerability.
Hackers only need to dupe users into visiting a malicious site hosting exploit code, said Santamarta, who added that his attack code works when someone browses with IE on a machine running Windows XP, Vista or Windows 7 that has QuickTime 7.x or the older QuickTime 6.x installed.
Santamarta's exploit works because Apple didn't tidy up QuickTime's code after developers dropped the "_Marshaled_pUnk" function.
"Although this functionality was removed in newer versions, the parameter is still present," Santamarta wrote in his advisory. "Why? I guess someone forgot to clean up the code."
His attack code also bypasses a pair of important security measures Microsoft has added to Windows: DEP (data execution prevention) and ASLR (address space layout randomization).
DEP and ASLR sidestepping isn't new: In late March, Dutch researcher Peter Vreugdenhil exploited a vulnerability in IE8 running on Windows 7 with attack code that evaded DEP and ASLR to win $10,000 at the fourth-annual Pwn2Own contest. And last month, Santamarta said that the IE8 bug he publicized could also be used to bypass the technologies.
"This issue can be used in a drive-by attack, as QuickTime is widely deployed, and for some reason people still [use] IE," said HD Moore, chief security officer at Rapid7 and the creator of the Metasploit penetration testing framework, in an e-mail. "Unlike other browser-based exploits, Windows 7 with ASLR/DEP will not make an appreciable difference due to the presence of an unprotected DLL within QuickTime itself."
In his advisory, Santamarta said he had sent details of his exploit to Metasploit. Moore confirmed that Metasploit developers are working on a module for the hacking tool kit and are shooting for a Tuesday release of a reliable exploit.
Like Santamarta, Moore believes that the bug was an oversight, not an intentional back door left by an Apple programmer.
Attacks that leverage Santamarta's bug will probably pop up soon, Moore added.
"This exploit will likely make it into the wild; the complete exploit details were provided as part of the initial blog post and with the QuickTime install base being what it is, there is incentive to include this vulnerability into the various [exploit] kits," Moore said.
Until Apple issues a patch, users can stymie attacks by uninstalling or disabling the QuickTime plug-in. Symantec recommended that users set the killbit for the QuickTime ActiveX control or rename the plug-in.
Instructions for setting an ActiveX control's killbit can be found on Microsoft's support site.
Apple last patched QuickTime for Windows on Aug. 11 when it shipped Version 7.6.7 to fix a different bug in the program's error logging.
Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, or subscribe to Gregg's RSS feed . His e-mail address is firstname.lastname@example.org.
- 13 pieces of advice for Yosemite beta testers
- The other Apple economy: $2B in devices on eBay
- Apple sends users scrambling for OS X Yosemite
- Long replacement cycle drags down iPad sales
- Apple unwraps OS X Yosemite public beta Thursday
- Apple grows Mac sales by 18% on the back of the MacBook Air
- Want an Apple watch? Just 3D print one
- What to listen for during Apple's earnings call today
- Mac sales will again outstrip industry average
- Apple, IBM spell out enterprise support for iPhone, iPad
Read more about Security in Computerworld's Security Topic Center.
- Enable secure remote access to 3D data without sacrificing visual perfomance Design and manufacturing companies must adapt quickly to the demands of an increasingly global and competitive economy. To speed time to market for...
- Virtually Delivered High Performance 3D Graphics "A picture is worth a thousand words." That old phrase is as true today as it ever was. Pictures (i.e., those with heavy...
- Best Practices for Securing Hadoop Historically, Apache Hadoop has provided limited security capabilities. To protect sensitive data being stored and analyzed in Hadoop, security architects should use a...
- Top Tips for Securing Big Data Environments: Why Big Data Doesn't Have to Mean Big Security Challenges Organizations must come to terms with the security challenges they introduce. As big data environments ingest more data, organizations will face significant risks...
- What should I look for in a Next Generation Firewall? SANS Provides Guidance With so many vendors claiming to have a Next Generation Firewall (NGFW), it can be difficult to tell what makes each one different....
- Responding to New SSL Cybersecurity Threat The featured Gartner research examines current strategies to address new SSL cybersecurity threats and vulnerabilities. All Security White Papers | Webcasts
Our new bimonthly Internet of Things newsletter helps you keep pace with the rapidly evolving technologies, trends and developments related to the IoT. Subscribe now and stay up to date!