From: Piotr Bania (bania.piotrgmail.com)
Date: Wed Apr 20 2005 - 00:08:47 CDT

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        RealNetworks RealPlayer/RealOne Player/Helix Player Remote Heap
        Overflow
        by Piotr Bania <bania.piotrgmail.com>
        http://pb.specialised.info

        Original location:
        http://pb.specialised.info/all/adv/real-ram-adv.txt
        

        Severity: Critical - Remote code execution.

        Software affected: (WINDOWS)
                                RealPlayer 10.5 (6.0.12.1040 - 1059)
                                RealPlayer 10
                                RealOne Player v2
                                RealOne Player v1
                                RealPlayer 8
                                RealPlayer Enterprise

                                (MAC)
                                Mac RealPlayer 10 (10.0.0.305 - 331)
                                Mac RealOne Player

                                (LINUX)
                                Linux RealPlayer 10 (10.0.0 - 3)
                                Helix Player (10.0.0 - 3)

        
        I. BACKGROUND

        Real*Player* is surely one of the most popular media players
        nowadays with over a 200 million of users worldwide.

        II. DESCRIPTION

        The problem exists when RealPlayer parses special crafted .ram
        file. Normaly .ram file looks like that:

        --CUT--
        http://www.host.com/media/getmetafile.ram?pinfo=fid:2663610| \
        bw:MULTI|mt:ro|mft:metafile|cr:1|refsite:276
        --CUT--

        this causes RealPlayer to contact "www.host.com" and try to
        download and play selected clip. The problem exists when host
        string is too long, like here:

        --CUT--
        http://www.ABC.ABC.ABC.ABC.ABC.ABC.ABC.ABC.ABC.<...>. \
        .org/media/getmetafile.ram?pinfo=fid:2663610|bw:MULTI|mt:ro| \
        mft:metafile|cr:1|refsite:276
        --CUT--

        While parsing such crafted .ram file heap memory is being
        corrupted at multiple locations, for example:

        FIRST HEAP CORRUPTION:

        ----// SNIP SNIP //--------------------------------------------
        (MODULE PNEN3260)
        01053089 76 0D JBE SHORT pnen3260.01053098
        0105308B 8B53 15 MOV EDX,DWORD PTR DS:[EBX+15]
        0105308E 890496 MOV DWORD PTR DS:[ESI+EDX*4],EAX<---
        01053091 8B43 15 MOV EAX,DWORD PTR DS:[EBX+15]
        01053094 40 INC EAX
        01053095 8943 15 MOV DWORD PTR DS:[EBX+15],EAX
        ----// SNIP SNIP //--------------------------------------------

        THE FINAL HEAP OVERWRITE:

        ----// SNIP SNIP //---------------------------------------------
        (MODULE PNCRT - PNCRT!strncpy+0x8b)
        60A2FA59 8917 MOV DWORD PTR DS:[EDI],EDX
        60A2FA5B 83C7 04 ADD EDI,4
        60A2FA5E 49 DEC ECX
        60A2FA5F ^74 AF JE SHORT PNCRT.60A2FA10
        ----// SNIP SNIP //---------------------------------------------

        
        In the following code EDI points to heap location, and EDX
        contains read bytes. Instruction at 60A2Fa59 writes value of
        EDX register into the location where EDI points (heap memory),
        this causes a heap memory corruption.

        III. IMPACT

        Successful exploitation may allow the attacker to run arbitrary
        code in context of user running RealPlayer.

        IV. VENDOR RESPONSE

        I would like to acknowledge the cooperation and responsiveness
        of the people at RealNetworks. Security patches are available at
http://www.real.com.

best regards,
Piotr Bania

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