A vulnerability, which was classified as problematic, has been found in libEBML up to 2012-08-26. This issue affects the function ReadDataFloat of the file ebmlnumber.c of the component MKV File Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

The ReadDataFloat function in ebmlnumber.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of service (assert fault) via a crafted mkv file.

The bug was discovered 11/07/2017. The weakness was presented 11/10/2017 as not defined mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. The identification of this vulnerability is CVE-2017-12783 since 08/10/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• libEBML

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• 2012-08-26

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