Summaryinfo

A vulnerability categorized as critical has been discovered in Google Android. This vulnerability affects the function msm_pcm_playback_close of the component Linux Kernel. The manipulation results in use after free (free). This vulnerability is cataloged as CVE-2017-8246. The attack must be initiated from a local position. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability classified as critical has been found in Google Android (Smartphone Operating System) (affected version unknown). Affected is the function msm_pcm_playback_close of the component Linux Kernel. The manipulation with an unknown input leads to a use after free vulnerability (Free). CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In function msm_pcm_playback_close() in all Android releases from CAF using the Linux kernel, prtd is assigned substream->runtime->private_data. Later, prtd is freed. However, prtd is not sanitized and set to NULL, resulting in a dangling pointer. There are other functions that access the same memory (substream->runtime->private_data) with a NULL check, such as msm_pcm_volume_ctl_put(), which means this freed memory could be used.

The bug was discovered 05/01/2017. The weakness was shared 05/12/2017 (Website). The advisory is available at codeaurora.org. This vulnerability is traded as CVE-2017-8246 since 04/25/2017. The exploitability is told to be easy. Local access is required to approach this attack. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/30/2019). It is expected to see the exploit prices for this product increasing in the near future.

The vulnerability was handled as a non-public zero-day exploit for at least 11 days. During that time the estimated underground price was around $25k-$100k.

Applying a patch is able to eliminate this problem.

The entries VDB-103224, VDB-103225, VDB-103226 and VDB-103227 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Smartphone Operating System

Vendor

• Google

Name

• Android

License

• free

Website

• Vendor: https://www.google.com/

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