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iDEFENSE Security Advisory 12.16.04: MPlayer MMST Streaming Stack Overflow Vulnerability
From: iDEFENSE Security Advisory <customerservice () idefense com>
Date: 16 Dec 2004 13:48:01 -0500
MPlayer MMST Streaming Stack Overflow VulnerabilityiDEFENSE Security Advisory 12.16.04http://www.idefense.com/application/poi/display?id=167December 16, 2004I. BACKGROUNDMPlayer is a movie player for Linux that also runs on many other Unices, and non- x86 CPUs. It plays most MPEG, VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, FLI, RM, NuppelVideo, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs. You can watch VideoCD, SVCD, DVD, 3ivx, DivX 3/4/5 and other formats. More information is available athttp://mplayerhq.hu/.II. DESCRIPTIONRemote exploitation of a stack overflow vulnerability in MPlayer could allow remote users to gain access to the computer.The vulnerability specifically exists due to a lack of bounds checking in /libmpdemux/asf_mmst_straming.c. If a specially crafted file specifies a large value for the length field, the overflow is triggered in get_data(). The vulnerable code follows: static int get_media_packet (int s, int padding, streaming_ctrl_t *stream_ctrl) { unsigned char pre_header[8]; char data[BUF_SIZE]; [...] packet_len = get_32 ((unsigned char*)&packet_len, 0) + 4;[!] if (!get_data (s, data, packet_len)) { printf ("command data read failed\n"); return 0; }[...] Once the get_data function overwrites stack memory, the saved return address can be controlled, thus allowing for execution of arbitrary code.III. ANALYSISIf remote exploitation is successful, the attacker would be able to gain access with the privileges of the user who attempted to view the stream.IV. DETECTIONiDEFENSE has confirmed that MPlayer version 1.0pre5 is vulnerable.The following distributions of Linux include MPlayer: Debian Linux Fedora Linux Gentoo Linux SUSE Linux V. WORKAROUNDUsers must be careful when accepting and opening media from untrusted sources. Do not accept media from those you do not trust. Do not stream media from servers you do not trust.VI. VENDOR RESPONSEA patch to address this vulnerability is available at:http://www1.mplayerhq.hu/MPlayer/patches/mmst_fix_20041215.diffVII. CVE INFORMATIONA Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has notbeen assigned yet.VIII. DISCLOSURE TIMELINE12/10/2004 Initial vendor notification12/16/2004 Public disclosureIX. CREDITThe discoverer of this vulnerability wishes to remain anonymous.Get paid for vulnerability researchhttp://www.idefense.com/poi/teams/vcp.jspX. LEGAL NOTICESCopyright © 2004 iDEFENSE, Inc.Permission is granted for the redistribution of this alertelectronically. It may not be edited in any way without the expresswritten consent of iDEFENSE. If you wish to reprint the whole or anypart of this alert in any other medium other than electronically, pleaseemail customerservice () idefense com for permission.Disclaimer: The information in the advisory is believed to be accurateat the time of publishing based on currently available information. Useof the information constitutes acceptance for use in an AS IS condition.There are no warranties with regard to this information. Neither theauthor nor the publisher accepts any liability for any direct, indirect,or consequential loss or damage arising from use of, or reliance on,this information.
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