main/translate.c in Sangoma Asterisk 13.28.0 and 16.5.0 allows a remote attacker to send a specific RTP packet during a call and cause a crash in a specific scenario.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger
    a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash
    occurs because of a NULL session media object dereference. (CVE-2019-15297)

  - main/translate.c in Sangoma Asterisk 13.28.0 and 16.5.0 allows a remote attacker to send a specific RTP
    packet during a call and cause a crash in a specific scenario. (CVE-2019-15639)

The Asterisk project reports :

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.

Note that there may be other scenarios that have not been found which can cause an audio frame with no origin to be given to the audio transcoding support and thus cause a crash.

ID	Name	Product	Family	Severity
423665	Alpine: multiple asterisk packages: security update to 16.5.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
423665	Alpine: multiple asterisk packages: security update to 16.5.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
400509	Alpine: multiple asterisk packages: security update to 16.4.1-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	high
400509	Alpine: multiple asterisk packages: security update to 16.4.1-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
128586	FreeBSD : asterisk -- Remote Crash Vulnerability in audio transcoding (7d53d8da-d07a-11e9-8f1a-001999f8d30b)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2019-15639

high

Tenable Plugins

high

high

high

high

high