FLAC 1.3.2 read_metadata_vorbiscomment_() Memory Leak / DoS

Secunia Research has discovered a vulnerability in FLAC, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error in the "read_metadata_vorbiscomment_()" function (stream_decoder.c), which can be exploited to cause a memory leak via a specially crafted FLAC file. The vulnerability is confirmed in version 1.3.2. Other versions may also be affected.


MD5 | 07426242d2126fc7f266229556f63d1c

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Secunia Research 2017/05/11

FLAC "read_metadata_vorbiscomment_()" Memory Leak
Denial of Service Vulnerability

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Flexera Software...............................................8
Verification.........................................................9

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1) Affected Software

* FLAC version 1.3.2. Other versions may also be affected.

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2) Severity

Rating: Moderately critical
Impact: Denial of Service
Where: From remote

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3) Description of Vulnerability

Secunia Research has discovered a vulnerability in FLAC, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the
"read_metadata_vorbiscomment_()" function (stream_decoder.c), which
can be exploited to cause a memory leak via a specially crafted FLAC
file.

The vulnerability is confirmed in version 1.3.2. Other versions may
also be affected.

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4) Solution

Fixed in the source code repository.

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5) Time Table

2017/04/06 - Initial contact to request security contact.
2017/04/06 - Maintainer responds with security contact.
2017/04/06 - Maintainer contacted with the vulnerability details.
2017/04/08 - Maintainer provides a patch in the official source
code repository.
2017/04/21 - Release of Secunia Advisory SA76102.
2017/05/11 - Public disclosure of Secunia Research Advisory.

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6) Credits

Discovered by Jakub Jirasek, Secunia Research at Flexera Software.

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7) References

The Flexera Software CNA has assigned the CVE-2017-6888 identifier
for the vulnerability through the Common Vulnerabilities and Exposures
(CVE) project.

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8) About Flexera Software

Flexera Software helps application producers and enterprises increase
application usage and the value they derive from their software.

http://www.flexerasoftware.com/enterprise/company/about/

Flexera Software delivers market-leading Software Vulnerability
Management solutions enabling enterprises to proactively identify and
remediate software vulnerabilities, effectively reducing the risk of
costly security breaches.

http://www.flexerasoftware.com/enterprise/products/

Flexera Software supports and contributes to the community in
several ways. We have always believed that reliable vulnerability
intelligence and tools to aid identifying and fixing vulnerabilities
should be freely available for consumers to ensure that users,
who care about their online privacy and security, can stay secure.
Only a few vendors address vulnerabilities in a proper way and help
users get updated and stay secure. End-users (whether private
individuals or businesses) are otherwise left largely alone, and
that is why back in 2002, Secunia Research started investigating,
coordinating disclosure and verifying software vulnerabilities.
In 2016, Secunia Research became a part of Flexera Software
and today our in-house software vulnerability research remains the
core of the Software Vulnerability Management products at
Flexera Software.

http://secunia.com/secunia_research/

The public Advisory database contains sufficient information for
researchers, security enthusiasts, and consumers to lookup individual
products and vulnerabilities and assess, whether they need to take
any actions to secure their systems or whether a given vulnerability
has already been discovered

http://secunia.com/advisories/

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9) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2017-7/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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