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Asterisk DoS Vulnerability (AST-2021-006)
Information
Severity
Severity
Medium
Family
Family
Denial of Service
CVSSv2 Base
CVSSv2 Base
6.8
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:S/C:N/I:N/A:C
Solution Type
Solution Type
Vendor Patch
Created
Created
3 years ago
Modified
Modified
3 years ago
Summary
Asterisk is prone to a denial of service vulnerability when negotiating T.38 with a zero port.
Insight
Insight
When Asterisk sends a re-invite initiating T.38 faxing and the endpoint responds with a m=image line and zero port, a crash will occur in Asterisk. This is a re-occurrence of AST-2019-004.
Affected Software
Affected Software
Asterisk Open Source 16.x, 17.x, 18.x and 16.x Certified Asterisk.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 16.16.2, 17.9.3, 18.2.2, 16.8-cert7 or later.