Asterisk PJProject TCP Connection DoS (AST-2016-005)

medium Nessus Plugin ID 90997

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Synopsis

A telephony application running on the remote host is affected by a denial of service vulnerability.

Description

According to its SIP banner, the version of Asterisk running on the remote host is either 13.x prior to 13.8.1 or 13.1-cert prior to 13.1-cert5. It is, therefore, affected by a flaw in PJProject due to a failure to close TCP connections after receiving new ones. An unauthenticated, remote attacker can exploit this, by opening multiple connections without sending data, to exhaust the number of allowed TCP connections, resulting in a denial of service condition.

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

Solution

Upgrade to Asterisk version 13.8.1 / 13.1-cert5, or apply the appropriate patch according to the Asterisk advisory.

Plugin Details

Severity: Medium

ID: 90997

File Name: asterisk_ast_2016_005.nasl

Version: 1.7

Type: remote

Family: Misc.

Published: 5/9/2016

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: Settings/ParanoidReport, asterisk/sip_detected

Patch Publication Date: 4/14/2016

Vulnerability Publication Date: 4/14/2016

Detections

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