Vulnerability Details

Asterisk Audio Transcoding DoS Vulnerability (AST-2019-005)

Published: 2019-09-06 05:05:08
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Detection Type:
Remote Banner Unreliable

Solution Type:
Vendor Patch

Summary:
Asterisk is prone to a denial of service vulnerability in audio transcoding.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
This issue presented itself when an RTP packet containing no audio (and thus no samples) was received. In a particular transcoding scenario this audio frame would get turned into a frame with no origin information. If this new frame was then given to the audio transcoding support a crash would occur as no samples and no origin information would be present. The transcoding scenario requires the 'genericplc' option to be set to enabled (the default) and a transcoding path from the source format into signed linear and then from signed linear into another format.

Affected Versions:
Asterisk Open Source 13.28.0 and 16.5.0.

Recommendations:
Upgrade to Version 13.28.1, 16.5.1 or later.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-15639

References:

https://downloads.asterisk.org/pub/security/AST-2019-005.html

Severity
Medium
CVSS Score
5.0
Published
2019-09-06
Modified
2019-09-06
Category
Denial of Service

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