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Asterisk DoS Vulnerability (AST-2021-001)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Asterisk is prone to a denial of service vulnerability in res_pjsip_diversion.
Insight
Insight
If a registered user is tricked into dialing a malicious number that sends lots of 181 responses to Asterisk, each one will cause a 181 to be sent back to the original caller with an increasing number of entries in the 'Supported' header. Eventually the number of entries in the header exceeds the size of the entry array and causes a crash.
Affected Software
Affected Software
Asterisk Open Source 13.38.1, 16.15.1 - 16.16.0, 17.9.1 and 18.1.1 - 18.2.0.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 13.38.2, 16.16.1, 17.9.2, 18.2.1 or later.