New! Vulnerability Priority Rating (VPR)
Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.
VPR Score: 3.7
SynopsisA telephony application running on the remote host is affected by a certificate validation vulnerability.
DescriptionAccording to its SIP banner, the version of Asterisk running on the remote host is potentially affected by flaw related to certificate validation when registering a SIP TLS device due to not properly verifying a server hostname against an X.509 Common Name (CN) field that has a NULL byte appended after the expected results. A man-in-the-middle attacker can exploit this, via a crafted certificate, to spoof arbitrary SSL servers and intercept network traffic.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
SolutionUpgrade to Asterisk 18.104.22.168 / 11.17.1 / 12.8.2 / 13.3.2 / 1.8.28-cert5 / 11.6-cert11 / 13.1-cert2, or apply the appropriate patch listed in the Asterisk advisory.