Date Discovered

November 23, 2007


Apple QuickTime is prone to a remote buffer-overflow vulnerability because the application fails to properly bounds-check user-supplied input before copying it to an insufficiently sized stack-based memory buffer. This issue occurs when handling specially crafted RTSP Response headers. Attackers can leverage this issue to execute arbitrary machine code in the context of the user running the affected application. Successful exploits will compromise the application and possibly the underlying computer. Failed attacks will likely cause denial-of-service conditions. QuickTime 7.3 is vulnerable to this issue; other versions may also be affected. UPDATE (December 4, 2007): Attackers are exploiting this issue through the Second Life Viewer to steal Linden dollars from unsuspecting victims.

Technologies Affected

  • Apple QuickTime Player 7.3
  • Gentoo Linux
  • Gentoo media-libs/win32codecs 20071007-R2
  • LINDEN RESEARCH, INC. Second Life Viewer
  • LINDEN RESEARCH, INC. Second Life Viewer


Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may reduce the chance of this issue being exploited.

Run all software as a nonprivileged user with minimal access rights.
To limit the effects of a successful compromise, run all client software with the least privileges required to function.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources. Never handle files from unknown sources.

Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker’s ability to exploit this vulnerability to execute arbitrary code.

The vendor has released QuickTime 7.3.1 to address this issue.



Krystian Kloskowski (h07) <h07@interia.pl> is credited with the discovery of this issue.

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