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                    Secunia Research 2018/12/13
                                            
       libexif EXIF_IFD_INTEROPERABILITY / EXIF_IFD_EXIF
                  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........................................................8
Verification.........................................................9

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1) Affected Software

*  libexif version  0.6.21. 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 libexif, which can
be exploited by malicious people to cause a DoS (Denial of Service).

1) An error when processing the EXIF_IFD_INTEROPERABILITY and
EXIF_IFD_EXIF tags can be exploited to exhaust available CPU
resources.

The vulnerability is confirmed in version 0.6.21. Other versions may
also be affected.

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4) Solution

No official solution is currently available.

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5) Time Table

2018/09/12 - Maintainer contacted with the vulnerability details.
2018/09/27 - Maintainer contacted for a follow-up.
2018/09/28 - Maintainer confirmed the vulnerability.
2018/11/13 - Maintainer contacted for a follow-up highlighting
             disclosure policy margins.
2018/12/12 - Release of Secunia Advisory SA84652 based on the
             disclosure policy.
2018/12/13 - Public disclosure of Secunia Research Advisory.

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6) Credits

Laurent Delosieres, Secunia Research at Flexera.

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7) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2018-20030 identifier for the vulnerability.

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8) About Flexera

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

http://www.flexera.com

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

https://www.flexera.com/products/software-vulnerability-management

Flexera  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 and today
our in-house software vulnerability research remains the core of
the Software Vulnerability Management products at Flexera.

https://www.flexera.com/company/secunia-research/

The  public Secunia Advisory database  contains  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.

https://www.flexera.com/company/secunia-research/advisories/

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9) Verification

Please verify this advisory by visiting the website:
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-28/

Complete list of vulnerability reports published by Secunia Research:
https://www.flexera.com/company/secunia-research/advisories/

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