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Asterisk DoS Vulnerability (AST-2021-007)
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
2 years ago
Modified
Modified
2 years ago
Summary
Asterisk is prone to a denial of service (DoS) vulnerability in the PJSIP channel driver.
Insight
Insight
When Asterisk receives a re-INVITE without SDP after having sent a BYE request a crash will occur. This occurs due to the Asterisk channel no longer being present while code assumes it is.
Affected Software
Affected Software
Asterisk Open Source 16.17.0, 16.18.0, 16.19.0, 18.3.0, 18.4.0 and 18.5.0.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 16.19.1, 18.5.1 or later.