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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.1055
                   A vulnerability has been fixed in VLC
                              6 November 2012

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           VLC media player
Publisher:         The VideoLAN Project
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
                   Mobile Device
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-5470  

Original Bulletin: 
   http://www.videolan.org/security/sa1203.html

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Security Advisory 1203

Summary           : Buffer overflow in PNG decoder
Date              : October 2012
Affected versions : VLC media player 2.0.3 and earlier
ID                : VideoLAN-SA-1203
CVE reference     : CVE-2012-5470

Details

When parsing an invalid PNG image file, a buffer overflow might occur.
Impact

If successful, a malicious third party could trigger an invalid memory access,
leading to a crash of the process of the VLC media player.

Because the overflow occurs while reading a buffer, rather than writing, it is
believed that this issue cannot lead to arbitrary code execution.

Threat mitigation

Exploitation of this issue requires the user to explicitly open a specially
crafted file.

Workarounds

The user should refrain from opening files from untrusted third parties or
accessing untrusted remote sites (or disable the VLC browser plugins), until
the patch is applied.

Alternatively, the PNG decoder plugin (libpng_plugin.*) can be removed manually
from the VLC plugin installation directory. This will prevent decoding of PNG
images.

Solution

VLC media player 2.0.4 addresses this issue. Patches for older versions are
available from the official VLC source code repository 2.0 and 1.1 branches.

References

The VideoLAN project
    http://www.videolan.org/ 
VLC official GIT repository
    http://git.videolan.org/?p=vlc.git 

History

14 October 2012
    Patch for VLC development version.
15 October 2012
    VLC media player 2.0.4 released.
2 November 2012
    Security advisory published.
    CVE reference.
3 November 2012
    Security advisory updated.

Rémi Denis-Courmont,
on behalf of the VideoLAN project

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