Main Vulnerability Database Vulnerabilities #VU22936

Input validation error in Asterisk Open Source and Certified Asterisk - CVE-2019-18976

Published: November 22, 2019

Vulnerability identifier: #VU22936

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-18976

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Asterisk Open Source
Certified Asterisk

How to mitigate CVE-2019-18976

Install updates from vendor's website.

Asterisk Open Source - update to 13.29.2
Certified Asterisk - update to 13.21-cert5

External References

Related Security Bulletins