Apple Darwin Streaming Server DESCRIBE Null Byte Denial of Service Vulnerability
iDEFENSE Security Advisory 12.03.2004 www.idefense.com/application/poi/display?id=159&type=vulnerabilities December 03, 2004
Darwin Streaming Server is an open source version of Apple's QuickTime Streaming Server technology that allows you to send streaming media to clients across the Internet using the industry standard RTP and RTSP protocols.
Remote exploitation of an input validation vulnerability in Apple Computer Inc.'s Darwin Streaming Server allows attackers to cause a denial of service condition. The vulnerability specifically occurs due to insufficient sanity checking on arguments to DESCRIBE requests. A remote attacker can send a request for a location containing a null byte to cause a denial of service condition resulting in the following backtrace:
Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 1026 (LWP 9648)] 0x4207ac9e in chunk_free () from /lib/i686/libc.so.6 (gdb) bt
inParams=0x81746f0, inData=0x0, isPush=0, foundSessionPtr=0x0) at APIModules/QTSSReflectorModule/QTSSReflectorModule.cpp:1262
Successful exploitation allows any remote unauthenticated attacker to crash the targeted server, thereby preventing legitimate users from accessing streamed content.
iDEFENSE has confirmed the existence of this vulnerability in Darwin Streaming Server 5.0.1. It is suspected that earlier versions are also vulnerable.
Employ firewalls, access control lists or other TCP/UDP restriction mechanisms to limit access to systems and services.
VI. VENDOR RESPONSE
The following updates are available from Apple Downloads (http://www.apple.com/support/downloads//) to address this vulnerability:
Mac OS X 10.2.8 Client http://www.apple.com/support/downloads//securityupdate_2004-12-02_v_1_0_ (Mac_OS_X_10_2_8_Client).html
Mac OS X 10.2.8 Server http://www.apple.com/support/downloads//securityupdate_2004-12-02_v_1_0_ (Mac_OS_X_10_2_8_Server).html
Mac OS X 10.3.6 Client http://www.apple.com/support/downloads//securityupdate_2004-12-02_v_1_0_ (Mac_OS_X_10_3_6_Client).html
Mac OS X 10.3.6 Server http://www.apple.com/support/downloads//securityupdate_2004-12-02_v_1_0_ (Mac_OS_X_10_3_6_Server).html
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the names CAN-2004-1123 to these issues. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
VIII. DISCLOSURE TIMELINE
09/10/2004 Initial vendor notification 09/15/2004 Initial vendor response 12/03/2004 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright (c) 2004 iDEFENSE, Inc.
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