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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

1 year ago

Modified

Modified

1 year 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.

Common Vulnerabilities and Exposures (CVE)