An issue was discovered in res_http_websocket.c in Asterisk 15.x through 15.2.1. If the HTTP server is enabled (default is disabled), WebSocket payloads of size 0 are mishandled (with a busy loop).

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

  - A Buffer Overflow issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5, and 15.x through
    15.2.1, and Certified Asterisk through 13.18-cert2. When processing a SUBSCRIBE request, the
    res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This
    code did not limit the number of headers it processed, despite having a fixed limit of 32. If more than 32
    Accept headers were present, the code would write outside of its memory and cause a crash. (CVE-2018-7284)

  - A NULL pointer access issue was discovered in Asterisk 15.x through 15.2.1. The RTP support in Asterisk
    maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may
    result in a codec using a different payload number, these desired ones are still stored internally. When
    an RTP packet was received, this registry would be consulted if the payload number was not found in the
    negotiated SDP. This registry was incorrectly consulted for all packets, even those which are dynamic. If
    the payload number resulted in a codec of a different type than the RTP stream (for example, the payload
    number resulted in a video codec but the stream carried audio), a crash could occur if no stream of that
    type had been negotiated. This was due to the code incorrectly assuming that a stream of that type would
    always exist. (CVE-2018-7285)

  - An issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5, and 15.x through 15.2.1, and
    Certified Asterisk through 13.18-cert2. res_pjsip allows remote authenticated users to crash Asterisk
    (segmentation fault) by sending a number of SIP INVITE messages on a TCP or TLS connection and then
    suddenly closing the connection. (CVE-2018-7286)

  - An issue was discovered in res_http_websocket.c in Asterisk 15.x through 15.2.1. If the HTTP server is
    enabled (default is disabled), WebSocket payloads of size 0 are mishandled (with a busy loop).
    (CVE-2018-7287)

According to its SIP banner, the version of Asterisk running on the remote host is 15.x prior to 15.2.2. It is therefore, affected by a denial of service vulnerability as described in AST-2018-006 advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its SIP banner, the version of Asterisk running on the remote host is 15.x prior to 15.2.2. It is therefore, affected by multiple vulnerabilities as described in AST-2018-001, AST-2018-002, AST-2018-003, AST-2018-004, AST-2018-005, & AST-2018-006 advisories.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
400774	Alpine: multiple asterisk packages: security update to 15.2.0-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	high
400774	Alpine: multiple asterisk packages: security update to 15.2.0-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
110568	Asterisk 15.x < 15.2.2 Denial of Service Vulnerability (AST-2018-006)	Nessus	Misc.	medium
107100	Asterisk 15.x < 15.2.2 Multiple Vulnerabilities (AST-2018-001 - AST-2018-006)	Nessus	Misc.	high

Detections

Analytics

CVE-2018-7287

medium

Tenable Plugins

high

high

medium

high