Allele Security Alert
ASA-2019-00541
Identifier(s)
ASA-2019-00541, CVE-2019-15639, AST-2019-005
Title
Remote Crash Vulnerability in audio transcoding
Vendor(s)
Digium, Inc
Product(s)
Asterisk Open Source
Affected version(s)
Asterisk Open Source 13.x before version 13.28.1
Asterisk Open Source 16.x before version 16.5.1
Fixed version(s)
Asterisk Open Source version 13.28.1
Asterisk Open Source version 16.5.1
Proof of concept
Unknown
Description
When audio frames are given to the audio transcoding support in Asterisk the number of samples are examined and as part of this a message is output to indicate that no samples are present. A change was done to suppress this message for a particular scenario in which the message was not relevant. This change assumed that information about the origin of a frame will always exist when in reality it may not.
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.
Technical details
Unknown
Credits
Gregory Massel
Reference(s)
AST-2019-005: Remote Crash Vulnerability in audio transcoding
http://downloads.digium.com/pub/security/AST-2019-005.html
AST-2019-005: Remote Crash Vulnerability in audio transcoding
http://downloads.digium.com/pub/security/AST-2019-005.pdf
AST-2019-005: Remote Crash Vulnerability in audio transcoding
https://seclists.org/fulldisclosure/2019/Sep/9
translate: Crash when frame does not have a “src” field set
https://issues.asterisk.org/jira/browse/ASTERISK-28499
[PATCH] AST-2019-005 – translate: Don’t assume all frames will have a src
http://downloads.asterisk.org/pub/security/AST-2019-005-13.diff
[PATCH] AST-2019-005 – translate: Don’t assume all frames will have a src
http://downloads.asterisk.org/pub/security/AST-2019-005-16.diff
CVE-2019-15639
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15639
CVE-2019-15639
https://nvd.nist.gov/vuln/detail/CVE-2019-15639
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Last modified: September 23, 2019