Apple Darwin Streaming Server DESCRIBE Null Byte Denial of Service Vulnerability iDEFENSE Security Advisory 12.03.04: I. BACKGROUND Darwin Streaming Server is an open source version of Apple
Apple Darwin Streaming Server DESCRIBE Null Byte Denial of Service Vulnerability iDEFENSE Security Advisory 12.03.04: I. BACKGROUND Darwin Streaming Server is an open source version of Apples QuickTime Streaming Server technology that allows you to send streaming media to clients across the Internet using the industry standard RTP and RTSP protocols. II. DESCRIPTION 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 #0 0x4207ac9e in chunk_free () from /lib/i686/libc.so.6 #1 0x4207ac24 in free () from /lib/i686/libc.so.6 #2 0x08096406 in FindOrCreateSession (inPath=0x408caf3c, inParams=0x81746f0, inData=0x0, isPush=0, foundSessionPtr=0x0) at APIModules/QTSSReflectorModule/QTSSReflectorModule.cpp:1262 III. ANALYSIS Successful exploitation allows any remote unauthenticated attacker to crash the targeted server, thereby preventing legitimate users from accessing streamed content. IV. DETECTION iDEFENSE has confirmed the existence of this vulnerability in Darwin Streaming Server 5.0.1. It is suspected that earlier versions are also vulnerable. V. WORKAROUND 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 IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp X. LEGAL NOTICES Copyright © 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@idefense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Jeremy, please verify.
Package nuked. If this package matures a bit and gets better support, perhaps it'll get added back to portage.
Thanks Jeremy! Closing w/o GLSA because the package was masked and smelled funny.
Nuked? Are you kidding me? Vulnerability aside, the package installs and works as advertised, a rarity in the media-video/* packages. Exploits aren't uncommon in other programs, but they aren't removed from portage outright. I can't believe this. The night of my planned install of this on another box. I'm used to getting stiff-armed (e.g. ivtv packages all hard masked?), so if someone could please PM or e-mail me the latest ebuild before it got "nuked," I would greatly appreciate it and move on without complaint.
Let me just elaborate on my situation. I use DSS behind a firewall. It is only used to serve MPEG4 content to two editors at my TV station so that they can determine in and out points for cutting & archiving MPEG2 files. No one outside our station has access to the DSS box. I doubt most folks in the Gentoo community are using DSS on more than a personal, experimental basis and aren't at great risk from this exploit. I understand hard masking the ebuild with a warning, but removing it outright just seems like overkill.
Nevermind. I salvaged the ebuild from a boxed that hadn't been synced in some time.
Given the information in bug #46782, this ebuild never worked to begin with, and nobody ever bothered to fix it or give info on how to fix it. Upstream support is non-existant, and there was no fix for this security hole released for the opensource version. I do not want to clean up after Apple's (or any other upstream) lack of support.
Created attachment 50932 [details] Darwin Streaming Server v5.0.3.2 ebuild I have created an ebuild for Darwin Streaming Server v5.0.3.2. According to Secunia <http://secunia.com/advisories/13367/> versions beyond 5.0.3 have fixed the DESCRIBE null byte vulnerability, but we haven't been able to find any other resources confirming this. Also, we have been unable to demonstrate the DESCRIBE null byte vulnerability in previous versions, so we haven't been able to confirm that it has been fixed in newer ones. We would appreciate code which can demonstrate the vulnerability. I am attaching the ebuild, a gentoo patch, and two rc files. I appreciate any feedback.
Created attachment 50934 [details, diff] Darwin Streaming Server v5.0.3.2 patch Darwin Streaming Server v5.0.3.2 patch used by ebuild
Created attachment 50935 [details] Darwin Streaming Server v5.0.3.2 dss.rc file Darwin Streaming Server v5.0.3.2 dss.rc file
Created attachment 50936 [details] Darwin Streaming Server v5.0.3.2 dss-admin.rc file Darwin Streaming Server v5.0.3.2 dss-admin.rc file
Jonathan: you should really open a new "Ebuild" bug asking a Gentoo dev to consider putting it in the tree. This bug was solved by removing the package from the tree. Finding someone that will accept to put it back is another subject...
