SB2019112218 - Multiple vulnerabilities in Digium Asterisk and Certified Asterisk

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Main Vulnerability Database SB2019112218

SB2019112218 - Multiple vulnerabilities in Digium Asterisk and Certified Asterisk

Published: November 22, 2019

Security Bulletin ID SB2019112218
Severity
High
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 33% Medium 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Improper access control (CVE-ID: CVE-2019-18790)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote attacker can send a specially crafted SIP request, change a SIP peer’s IP address and hijack the calls.

Note: This vulnerability is only exploitable when the “nat” option is set to the default, or “auto_force_rport”.


2) Input validation error (CVE-ID: CVE-2019-18976)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the "res_pjsip_t38.c" module. A remote attacker can cause a denial of service condition when Asterisk receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP.


3) OS Command Injection (CVE-ID: CVE-2019-18610)

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the "manager.c" module. A remote authenticated Asterisk Manager Interface (AMI) user without “system” authorization can use a specially crafted “Originate” AMI request to execute arbitrary system commands.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install update from vendor's website.

References