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Category:   Application (Generic)  >   FLAC Vendors:
FLAC Integer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018815
SecurityTracker URL:
CVE Reference:   CVE-2007-4619   (Links to External Site)
Date:  Oct 12 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.2.1
Description:   A vulnerability was reported in Free Lossless Audio Codec (FLAC). A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted FLAC media file that, when loaded by the target user, will trigger an integer overflow in libFLAC and execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

Winamp is also affected.

The vendor was notified on August 29, 2007.

Sean de Regge reported this vulnerability via iDefense.

Impact:   A remote user can create a FLAC media file that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fixed version (1.2.1).
Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 22 2007 (Red Hat Issues Fix) FLAC Integer Overflow Lets Remote Users Execute Arbitrary Code
Red Hat has released a fix for Red Hat Enterprise Linux 4 and 5.

 Source Message Contents

Subject:  iDefense Security Advisory 10.11.07: Multiple Vendor FLAC Library

Multiple Vendor FLAC Library Multiple Integer Overflow Vulnerabilities

iDefense Security Advisory 10.11.07
Oct 11, 2007


Free Lossless Audio Codec (FLAC) is a popular file format for audio data
compression. AOL Corp.'s Winamp media player has support for the FLAC
format. More information about FLAC and Winamp is available at the
following URLs.


Remote exploitation of multiple integer overflow vulnerabilities in
libFLAC, as included with various vendor's software distributions,
allows attackers to execute arbitrary code in the context of the
currently logged in user.

These vulnerabilities specifically exist in the handling of malformed
FLAC media files. In each case, an integer overflow can occur while
calculating the amount of memory to allocate. As such, insufficient
memory is allocated for the data that is subsequently read in from the
file, and a heap based buffer overflow occurs.


Exploitation allows remote attackers to execute arbitrary code in the
context of the user attempting to play the media file. Exploitation
requires that an attacker persuade a targeted user into opening a
malformed FLAC file.


iDefense has confirmed the existence of these vulnerabilities libFLAC
1.2.0, as well as the version of libFLAC included in in the full 5.35
version Winamp. Previous versions of libFLAC may also be vulnerable.
The lite version of Winamp does not include support for the FLAC file
format, and as such is not vulnerable.


For Winamp users, it is possible to remove support for the FLAC file
format by uninstalling the FLAC input plug-in.


The FLAC maintainers have released version 1.2.1 of FLAC to address
these vulnerabilities. AOL Corp. has addressed this vulnerability in
version 5.5 of Winamp. For more information see the FLAC change log at
the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-4619 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


08/29/2007  Initial vendor notification
08/29/2007  Initial vendor response
10/11/2007  Coordinated public disclosure


This vulnerability was reported to iDefense by Sean de Regge.

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Copyright © 2007 iDefense, Inc.

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
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 There are no warranties with regard to this information. Neither the
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