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Secunia Research 03/08/2016
LibGD "_gdContributionsAlloc()" Integer Overflow
Denial of Service Vulnerability
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Table of Contents
Affected Software....................................................1
Severity.............................................................2
Description of Vulnerabilities.......................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9
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1) Affected Software
* LibGD version 2.2.2.
Prior 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 Vulnerabilities
Secunia Research has discovered a vulnerability in LibGD, which can
be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an integer overflow error within
the "_gdContributionsAlloc()" function (gd_interpolation.c)
and can be exploited to cause an out-of-bounds memory write access
or exhaust available memory.
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4) Solution
Update to version 2.2.3.
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5) Time Table
03/07/2016 - Initial contact with vendor.
03/07/2016 - Vendor responds and confirms the issue and sends a patch.
07/07/2016 - Replied to the vendor the patch is incomplete.
13/07/2016 - CVE requested from Mitre.
13/07/2016 - Mitre assigns CVE-2016-6207 for the issue.
19/07/2016 - Vendor patches the issue in the source code repository.
19/07/2016 - Release of Secunia Advisory SA71416
22/07/2016 - Vendor releases fixed version 2.2.3.
03/08/2016 - Public disclosure of Research Advisory.
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6) Credits
Discovered by Kasper Leigh Haabb, Secunia Research at Flexera
Software.
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7) References
The Common Vulnerabilities and Exposures (CVE) project has assigned
the CVE-2016-6207 identifier for the vulnerability.
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8) About Secunia (now part of Flexera Software)
In September 2015, Secunia has been acquired by Flexera Software:
https://secunia.com/blog/435/
Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:
http://secunia.com/products/
Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.
http://secunia.com/advisories/
Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:
http://secunia.com/secunia_research/
Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:
http://secunia.com/company/jobs/
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9) Verification
Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2016-9/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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